Omega PCL-2A User guide

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User’s Guide

PCL-2A

Digital Indicator

Revision 4.2 5/1/2000

Page 2

Servicing North America:

USA: One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford CT 06907-0047

TEL: (203) 359-1660 FAX: (203) 359-7700 e-mail: [email protected]

Canada: 976 Bergar

Laval (Quebec) H7L 5A1 TEL: (514) 856-6928 FAX: (514) 856-6886 e-mail: [email protected]

For immediate technical or application assistance:

USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA

Customer Service: 1-800-622-2378 / 1-800-622-BEST

Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA

Mexico: Tel: (001) 800-826-6342 FAX: (001) 203-359-7807

En Espan˜ ol: (001) 203-359-7803 e-mail: [email protected]

[email protected]

Servicing Europe:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands

TEL: +31 (0)20 6418405 FAX: +31 (0)20 6434643 Toll Free in Benelux: 0800 0993344 e-mail: [email protected]

Czech Republic: Rudé armády 1868, 733 01 Karviná

TEL: +420 (0)69 6311899 FAX: +420 (0)69 6311114 Toll Free in Czech Rep.: 0800-1-66342 e-mail: [email protected]

France: 9, rue Denis Papin, 78190 Trappes

TEL: +33 (0)130 621400 FAX: +33 (0)130 699120 Toll Free in France: 0800-4-06342 e-mail: [email protected]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

TEL: +49 (0)7056 3017 FAX: +49 (0)7056 8540 Toll Free in Germany: 0800 TC-OMEGA

e-mail: [email protected]

United Kingdom: One Omega Drive, River Bend Technology Centre

ISO 9002 Certified Northbank, Irlam, Manchester

M44 5EX, United Kingdom TEL: +44 (0)161 777 6611 FAX: +44 (0)161 777 6622 Toll Free in the United Kingdom: 0800 488 488 e-mail: [email protected]

OMEGAnet®On-Line Service Internet e-mail

www.omega.com [email protected]

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter specifications without notice. WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

Revision 4.2 5/1/2000

Page 3

Revision 4.3 3/2004

Section

Description

Page

Base Unit Overview

Quick Select Module Overview

The GQS-1 Quick Select Pressure Module

The GQS-2 Quick Select Pressure Module

The GQS-RT Quick Select RTD Temperature Interface Module

The GQS-TC Quick Select Thermocouple Module

2.0

2.1

Un pack ing Product Upon Receipt

2.2

Prod uct Storage

2.3

Product Cleaning

3.0

Sys tem Start-Up General Instructions

3.1

Pow er Cord Connection

3.2

Bat tery Installation

3.3

In stal la tion of Quick Select Modules

3.4

Start ing Up MDI Indicator System

3.5

Op tion al System Start Up Procedures

3.5.1

Auto Off- Battery Save Function

3.5.2

Bat tery Life Overview

3.5.3

Low Battery Icon

3.5.4

Pro gram ming Date and Time Information

3.5.5

In put of Owner/Operator Information

3.6

Re mov ing Quick Select Modules

4.0

5.0

6.0

Zero Function

6.1

Ze ro ing One of Two Installed Quick Select Pressure Module

7.0

8.0

Se lect ing a Factory Programmed Engineering Unit

Set ting Up a Custom (User De ned) Engineering Unit

Us ing a Custom (User De ned) En gi neer ing Unit

Dis play of Two Different En gi neer ing Units,

for Two Installed Modules

Tem per a ture Selection for H

O Conversion Factor

9.0

Tare Function

Us ing the Hold Function

Page 4

Revision 4.3 3/2004

Section

Description

Page

Set Up of Damping Function

Ac ti vat ing or Discontinuing Damping

Set Up of Percent Function

Use of Percent Function

Set Up for Flow Velocity & Volume Measurement

Flow Velocity Measurement

En gi neer ing Unit Selection for Flow Velocity

Flow Volume Measurement

En gi neer ing Unit Selection for Flow Volume

Si mul ta neous Display of Two Flow Measurements in

In de pen dent En gi neer ing Units

Simultaneous Display of Flow (Velocity or Volume)

with a Pressure Measurement

Simultaneous Display of Flow (Velocity or Volume)

with a Temperature Measurement

Simultaneous Display of Flow Volume and Flow Velocity

Simultaneous Display of Flow (Velocity or Volume) and An

Elec tri cal Output Measurement

Leak Rate Function Set Up

Pres sure Decay Function Set Up

Mod ule Selection for Per form ing Leak Rate or Pressure

De cay Tests

Performing Leak Rate or Pressure Decay Tests

Tem per a ture Measurement Using RTD Probes

Set ting Up the Calibrator for Temperature Measurement

with an RTD Probe

Cal i brat ing and Programming of the RTD Interface and Probe

Tem per a ture Measurement Using Thermocouple

Set ting Up Calibrator for Temperature Measurement

with a thermocouple

Set ting Up for Pressure and Temperature Switch Testing

Trip Point Testing

Deadband Testing

Con  g ur ing RS232 Interface for Use With Dumb Terminal

RS232 Con guration Options

RS232- ISO1745 Mode Func tion al Overview

RS232- Journal Mode Func tion al Overview

RS232- Interface Inquiry Mode Func tion al Overview

RS232-Interface Remote Mode Operation

Page 5

Revision 4.3 3/2004

Section

Description

Page

RS232 Set Up for Journal Mode Operation

RS232 Set Up for Inquiry Mode Operation

20.0

Status

20.1

Re view ing Instrument Status

20.2

Bat tery Check Function

21.0

21.1

Ac cu ra cy of Dual Module Measurements

21.2

Set ting Up Dual Module Differential Pressure Measurement

21.3

Set ting Up a Dual Module Summation Pressure Measurement

22.0

Se quen tial Data Logging

22.2

Set ting Up the Data Logging Function

22.3

Data Labeling Function

22.4

Au to mat ic Data Logging

22.5

Manual Data Logging

22.6

Review of Stored Data on display

22.7

Erasing of Selected Stored Data

22.8

Erasing All Stored Data

23.0

23.1

Set Up and Use of Certi cation Generation Data Logging

24.0

Con nec tion of MDI to Computer for Upload of Stored Calibration Data

24.1

Installing and Operating Upload Software Utilities

24.2

Replacement of Data Logging Memory Back-up Battery

25.0

25.1

Event Timer Set Up

25.2

Data Logging Set Up for Event Timer Operation

26.0

Alarm Function Overview

26.1

Alarm Set Up and Operation

27.0

27.1

Access Codes

27.2

Calibration/Recerti cation Overview

27.3

Required Equipment

27.4

As Received Readings-Base Unit Electronics

27.5

Adjustment and Calibration Base Unit Electronics

27.6

Quick Select Pressure Module Recerti cation

APPENDICES

Appendix A –

Appendix B –

ASCII Character Set

Appendix C –

Appendix D –

Serial Communications – Remote Mode

Appendix E –

Appendix F –

Certi cation of the TC1 Thermocouple Interface Module

Page 6

Revision 4.3 3/2004

Section 1.0 Introduction

Congratulations! Your purchase of the Mod u lar Digi-

tal Indicator (MDI) calibration system equips you to

perform a wide variety of pressure and tem per a ture

measurements. The general pressure and tem per a ture

measurement capabilities of the MDI measurement

ware as well as the avail abil i ty of optional data logging

capability.

The MDI products are complete pressure calibration

ranges, measurement and display of current and voltage.

The MDI system also provides the ability to perform

high accuracy tem per a ture mea sure ment. Conversion

between tem per a ture and pressure measurement can be

done in a matter of seconds and requires no tools.

A standard MDI system consists of a base unit that acts

as a host for one or two Quick Select modules. The

Quick Select pressure modules are in ter change able

and are available in a wide variety of ranges from 0.25

inches of water to 10,000 psi. A brief de scrip tion of the

main components of an MDI system follows. In ad-

di tion, Quick Select modules are available that allow the

base unit to work in con junc tion with most any standard

RTD tem per a ture probe or thermocouple.

Section 3 and its various subsections include all the in-

formation needed to begin using the MDI system for ba-

sic pressure and temperature mea sure ment. Higher level

functions are detailed in later sections of this manual. It

this manual be re viewed prior to using the MDI system

for higher level and ap pli ca tion speci c measurement

and test activities.

this manual may result in personal injury and/or dam-

age to the instrument, accessories, prod ucts under test or

other equipment.

The base unit functions as the host for the Quick Select

pressure and temperature modules designated in this

manual by the “GQS” pre x. Each base unit includes a

keypad, mi cro pro ces sor based elec tron ics and a two line

LCD display. The base unit displays the mea sure ment

data trans mit ted from the Quick Select module(s).

Mea sure ment outputs from two installed Quick Se-

lect modules can be si mul ta neous ly displayed. Quick

Select modules for the measurement of either pres-

2 module “bays” in the base unit. Pressure en gi neer ing

units can be in de pen dent ly selected from the library of

twelve factory programmed or one operator des ig nat ed

en gi neer ing unit. Tem per a ture measurement data can be

dis played in degrees Celsius, Fahrenheit, Kelvin or Ran-

kine. In addition, when used with the GQS-RT1 Quick

Select module for temperature mea sure ment with an

RTD temperature probe, the MDI system can display the

RTD mea sure ment in ohms. GQS-TC1 modules allow

the display of the same temperature units as well as mil-

li volts

In addition to displaying two pressure mea sure -

ments si mul ta neous ly the operator can elect to display

pressure and tem per a ture or the mea sured value from

either of the two installed Quick Select modules as well

as either a voltage or mA measurement. This allows for

the easy calibration and test of trans duc ers, trans mit ters

and switch es.

The base unit includes a wide variety of general and

application speci c measurement ca pa bil i ties. These

capabilities allow the MDI measurement and cal i bra tion

measurement as well as application speci c pressure

mea sure ment activities. Basic pres sure and temperature

measurement ca pa bil i ties include; max/min recall, op-

erator pro gram ma ble tare values, display hold, operator

programmable damp ing and user selected engineering

units. Application speci c ca pa bil i ties include;  ow

velocity mea sure ment,  ow volume measurement, leak

detection, leak rate quanti cation and switch testing.

Optional data logging, time delayed data logging and

pro gram ma ble alarms are also avail able.

The Quick Select pressure module is a calibrated pres-

units are available in a wide variety of pressure measure-

ment ranges. Quick Select interface modules are also

available to allow the MDI base unit to provide pre ci sion

tem per a ture measurement data using standard RTD (Re-

tor tem per a ture sensing devices. The GQS-RT1 module

allows the MDI system to function with most common

plat i num, nickel and copper RTDs and the GQS-TC sup-

ports use of thermocouple temperature detectors.

The Quick Select module communicates with the base

unit via a 10 pin connector. Quick Select pressure mod-

ules slide into the base unit au to mat i cal ly align ing the

female 10 pin connector on the Quick Select pressure

module with the male 10 pin connector in the base unit.

All calibration data is stored in Electrically Erasable

Programmable Read Only Memory (EEPROM) resident

in the Quick Select module. As such, any Quick Select

module can be used in any base unit and the mea-

sure ment system will provide mea sure ment accuracy in

con form ance with the published speci cation.

Section 1.1 Base Unit Overview

Section 1.2 Quick Select ModulesOver view

Page 7

Revision 4.3 3/2004

Section 1.2.1 The GQS-1 Quick Select

GQS-1 Quick Select pressure modules provide spe-

cial ized low pressure measurement capabilities. GQS-1

Quick Select pressure modules incorporate a micro-ma-

chined silicon variable capacitance mod ule.

Inside the module there is a micro-machined silicon

diaphragm. This diaphragm is between two non-mov-

ing plates on which metal has been sputtered. The air

between the diaphragm and the non-moving plates acts

as an insulator.

As pressure or vacuum is applied to the module, the

diaphragm moves changing the distance between the

diaphragm and the  xed plates. This change in distance

changes the ca pac i tance of the module. It is this variable

capacitance that is measured and cor re lat ed to pressure

or vacuum during the cal i bra tion process.

The module is connected to a circuit board that gen-

er ates a linear signal ramp and applies this signal to the

top plate of the module while an equal and opposite

When the measured pressure is balanced, for ex am ple,

when both ports are opened to atmosphere, the distance

between the diaphragm and both of the  xed plates is the

is capacitively coupled to the equal and opposite signal

applied to the bottom plate. As a result, no signal current

will  ow through the center plate (diaphragm). When

the diaphragm is moved off center by the ap pli ca tion of

pressure or vacuum, the excess current  ows through

the center plate to an input differentiator on the circuit

board. The differentiator translates the frequency of the

module output into a voltage which is scaled over the

full scale range of the module.

GQS-1 modules are available in ranges from 0.25 inches

of water through 200 inches of water. These modules

can be con gured to provide differential/gauge or

compound pressure measurement ca pa bil i ties. They are

designed for use on clean, dry, non cor ro sive and non-

conductive gases.

The GQS-2 Quick Select pressure module in cor po rates

a micro-machined piezoresistive strain gauge module.

This technology takes advantage of the fact that, when

put under stress, (as with the  exing of a diaphragm

under pressure or vacuum) the resistive properties of

a piece of silicon will change. In the manufacturing

process resistors are deposited in a silicon substrate. The

resistors are typically con  g ured in a wheatstone bridge

orientation. When positioned in this fashion, the output

will be near zero when no pressure (stress) is applied

and will increase in a near linear fashion with the ap-

plication of pressure or vacuum. The reverse side of the

thickness for the given pressure range.

When power is applied to the module the level of re sis -

tance across the wheatstone bridge will change in pro-

por tion to the level of pressure applied. The output from

the module is extremely repeatable and has min i mal

hysteresis due to the fact that the module substrate is

within the Quick Select pressure module. The ampli-

 ed output is then calibrated over the operating range of

the module. Cal i bra tion co ef  cients for the module are

Memory (EEPROM) within the Quick Select pressure

mod ule.

GQS-2 modules are available in ranges from 5 through

gauge, compound or absolute pres sure measurement,

as well as vacuum mea sure ment capabilities. GQS-2

modules in range of 5 psi are designed for use on clean,

dry, non cor ro sive and nonconductive gases. 316 stain less

through 0/10,000 psi.

The GQS-RT1 allows the MDI base unit, when used

with RTD temperature probes, to provide precision

tem per a ture measurement data. The GQS-RT1 plugs

directly into the Quick Select module bay in the base

unit. Any standard RTD probe with a Switchcraft TA4M

connector can be plugged into the Switchcraft TA4F

connector on the module.

The GQS-RT1 module comes factory programmed

with the curves for Pt 100 (385 & 392), Cu 10 and Ni

range of 0/400 ohms. The GQS-RT2 is sup plied factory

pro grammed to support the Pt1000 ( 385 & 392) RTD.

This module will support RTDs through an output up to

4000 ohms. The GQS-RT module can be pro grammed

with coef cients for other RTD probes of interest and

on-board library can be programmed into the GQS-RT

unit to provide en hanced accuracy.

Each GQS-RT module can ac com mo date up to 8 differ-

ent programmed RTD cal i bra tion curves. Pro gram ming

of the RT module is accomplished via an optional soft-

ware package and any PC compatible computer with an

available standard serial com mu ni ca tion port.

Pressure Module

Section 1.2.2 The GQS-2 Quick Select

Pressure Module

Section 1.2.3 The GQS-RT Quick Select RTD

Interface Module

Page 8

Revision 4.3 3/2004

Section 1.2.4 The GQS-TC1 Quick Select

The GQS-TC1 allows the base unit, when used with a

thermocouple interface module, to perform tem per a ture

measurement. The GQS-TC1 plugs directly into the

Quick Select module bay in the base unit. The ther mo -

cou ple is then attactched to the GQS-TC1 module via a

male “miniature ther mo cou ple connector.”

General instructions on unpacking and care follow.

Prior to removing the MDI Digital Indicator System from

the packaging material inspect all cartons for shipping

damage. Document any damage evident in the event that

a damage claim must be made against the shipper. After

inspection, remove the base unit, module(s), manual and

any accessories purchased from the packaging material.

Retain the packaging for use in returning the MDI to the

factory for future recerti cation or repair.

The product should be stored in an area that is maintained

in the temperature range indicated in the storage tem-

per a ture in the product speci cation. The storage tempera-

ture limits are –4 to + 158 degrees Fahrenheit. Storage of

product in environments that will exceed these tem per a-

ture limits results in sig ni cant risk of product damage. It

is rec om mend ed that the product not be left in closed cars

or truck cabs as temperature damage can easily occur due

to the “greenhouse effect” of closed vehicles or extreme

cold tem per a tures that can result from winter conditions.

The enclosure of the MDI system is not watertight. As

does not penetrate the enclosure for the base unit or Quick

Select modules. Cleaning of the product should be done

with a cloth moistened with a warm, mild detergent mixture.

The MDI system can perform a wide variety of simple

and complex temperature and pressure based mea sure -

ment, test and calibration operations. Due to the menu

driven set up procedures the system can be quickly and

easily con gured for most any of its measurement func-

tions. By following the steps in this section you can be

ready to use your MDI system to perform basic pressure

and tem per a ture mea sure ment functions in a matter of

minutes.

The MDI system is powered via standard 110 Vac, 60 Hz,

230 Vac, 50 Hz or 100 Vac, 60 Hz line power. The line

power is adapted to meet the 9 Vdc power requirements

of the MDI system via a stan dard outlet mount ed voltage

adapter.

The adapter plugs into the round receptacle located in the

center of the back panel, over the 9 pin RS232 connector.

Step 1

Plug adapter into the receptacle in the center of

the back panel of the MDI instrument over the RS 232

connector.

Step 2

Plug the side with the adapter mounted in the

appropriate wall outlet.

Step 3

To operate the unit simply press the ON/OFF

key with the system connected as outlined in steps 1 and 2.

MDI indicators are available in two optional con  g u-

ra tions for por ta ble operation. These options are:

1 – Rechargeable nickel cadmium power pack.

2 – Battery holder that sup ports the use of  ve AA al-

ka line, zinc and non-rechargeable

batteries.

Battery Life*

Time in Hours

NiCad

Alkaline

Pack

Standard Operation

Total available time with:

Backlight on

4.5

3.25

Optional Loop supply (no load)

Optional Loop supply (12mA load)

4.5

Backlight & loop supply (no load)

Backlight & loop supply (12 mA load)

nominal temperature of 70 degrees Fahr en heit. Use of the MDI product

at temperature signi cantly greater than or less than 70 degrees

Fahr-

enheit will adversely effect battery life.

Battery installation and replacement is detailed in this

Section 2.0 Un pack ing & General Care

Section 2.1 Unpacking Product Upon Receipt

Section 2.2 Product Storage

Thermocouple Interface Module

Section 3.1 Power Cord Connection

Section 3.2 Battery Installation (Op tion al)

Section 2.3 Product Cleaning

Section 3.0 System Start-Up General In struc tions

Page 9

Revision 4.3 3/2004

Step 1

To gain access to the battery compartment, turn

the unit bottom side up.

Step 2

Open the battery compartment by turning the

quarter turn screw in the battery compartment door.

Step 3

With the screw no longer engaged to the main

case lift the door, screw end  rst, and slip the opposite

end of the door out of its slots.

For MDI units designed for use with non-re charge able

battery types proceed to step 4.

For MDI units de signed

for use with the NiCad power pack skip to

Step 9.

Step 4

Note polarity information for battery in stal -

la tion is di a grammed inside the battery en clo sure.

Step 5

Remove the retaining clips over each of the

battery compartments by inserting a small screw driv er in

each end of the clips and  exing the end clip away from

the battery. With the clip  exed outward, left the retainer

up. Repeat the process for the other side of the retainer

clip. Remove each of the  ve (5) clips in this fashion.

Step 6

Locate the  ve AA replacement batteries to be

used. Install these bat ter ies as shown on the diagram in

the battery enclosure.

Step 7

Reinstall the  ve (5) battery retaining clips

by placing over the battery and pressing each end until

locked in position.

Step 8

Replace battery compartment cover by sliding

cover back into position and securing the screw.

Step 9

Rechargeable Nickel Cadmium Power Pack

Replacement

The MDI system, when equipped with the

re charge able

battery operation option, includes au to mat ic built-in

charg ing circuitry. This charging circuit will au to mat i-

cal ly charge the battery pack

when ev er

the MDI system

is operated off line power. Due to this, MDI in stru -

ments with this option,

must

only be used with nickel

cad mi um battery pack provided by your MDI supplier.

Mod i  ca tion of the system for use with other battery

packs or non-re charge able battery types such as alkaline

batteries will cause risk of personal injury, in stru ment

damage and ex plo sion.

With the battery enclosure open locate and lift out the

battery pack assembly.

Step 10

Grasp the connector across the narrow sides and

press on the clip mechanism to release the connector.

Step 11

While pressing on the clip, with constant even

pressure, pull the con nec tor outward.

Important Note:

Do not throw away the spent battery

pack. Used pack should be treated as haz ard ous waste

and for ward ed to a recycling facility.

Step 12

Connect the replacement battery pack and place

the pack in the battery compartment.

Step 13

Replace battery compartment cover by sliding

cover back into position and securing the screw.

Battery installation/replacement is now complete.

Section 3.3 In stal la tion of Quick Select

Quick Select modules should be installed with

the power off on the base unit. Failure to turn the base

unit off prior to changing pressure mea sure ment mod-

ules could damage the instrument or module electron-

ics or “lock up” microprocessor operation. If power is

in ad vert ent ly left on and the base unit locks up (looses

communication) after changing Quick Select modules,

3.6 for the procedure to remove a Quick Select module.

To insert a Quick Select module follow the process

below.

Step 1

Make certain the power is off on the base unit.

Step 2

Hold the base unit, in one hand, with the back

end of the MDI system facing the operator.

Step 3

Holding the Quick Select module to be in stalled

in the other hand, align the module with the locking tab

toward the outer edge of the instrument on the side the

module is to be installed. (The manifold and labels will

be perpendicular to the bottom of the instrument).

Step 4

Slide the Quick Select module into the module

base until the retaining/release tab, the black push tab,

pops out the side of the MDI in stru ment case. When the

black tab/push button pops out the module is locked into

position.

Step 5

Installation of the Quick Select module is now

complete. If an GQS-RT1 RTD interface module is to be

used, plug the desired RTD probe into the con nec tor on

the Quick Select Module. To set up the MDI and GQS-

RT1 combination to the desired measurement parameters

proceed to Section 16.

Module in Vacant Module Bay

Page 10

Revision 4.3 3/2004

Important Notes:

using te on tape or similar sealant, be tested at low

pressure prior to applying elevated pressures and

2 –

If only one module is to be used, install the Quick

Select System Protection module provided. Follow

the same procedure to install the system protection

module as that used for a standard pressure

mea sure ment module. Both module bays of the base

unit should contain a Quick Select module to protect

from dirt or other debris getting into the base unit

as sem bly. If only one Quick Select pressure module

is needed install the System Protection Module (part

number GQS-XS) supplied with your unit at the time

of shipment when using the MDI system.

Section 3.4 Starting-Up the MDI System

After the desired Quick Select pressure module(s) or

Quick Select temperature mea sure ment interface module

and probe has been installed the MDI System can be

optional nickel cadmium batteries charged:

Turn the system power on by pressing the on/off key on

the instrument’s key pad.

During the start up process the MDI will display a

• identify the type of module in each bay

• identify the range of each installed

• module

(ohms range for GQS-RT modules)

• indicate that the installed module (pressure

only) has been calibrated with enhanced temperature

performance. (consult speci cation sheet for detail on

this capability)

After the start-up routine is complete the MDI will dis-

play:

(for base with two pressure modules in stalled)

The range indication is provided in the primary en gi -

neer ing unit for each installed Quick Select module.

Upon initial power up an MDI base unit used with an

GQS-RT1 temperature module and probe will default

to displaying the ohms (resistance value) for the probe.

Once set up this combination will default to the pre-

vi ous ly used tem per a ture mea sure ment unit, such as

Celsius, Fahrenheit, Kelvin or Rankine. The primary

engineering unit for a given Quick Select pressure

module, along with the mea sure ment range, is included

on the module label. The in for ma tion on the left side of

the display cor re sponds with the Quick Select module

installed in the left module bay and information on right

module installed in the right module bay. If only one

module is installed the cor re spond ing side of the display

will indicate “no module” on power up.

After the third screen the MDI system will com mence

providing measurement data. The format for display of

the measurement data is as follows:

(primary en gi neer ing unit)

(measured value with sign)

When only one module is installed, the side of the dis-

play corresponding to the side of the base unit that does

not have a module will display “- - - - -”

If necessary, the MDI system, used with a Quick Select

pressure module, may be zeroed by pressing the Zero

key prior to beginning measurement ac tiv i ties. Ad di -

tion al details on zeroing the MDI system are provided in

Section 6.0 of this manual.

The MDI system is now ready for basic pressure or

tem per a ture measurement. Simply connect the pressure

port(s) of the Quick Select pressure module(s) to be

used to the pressure source to be measured. If a gauge

pressure measurement is to be made using a differen-

tial Quick Select pressure module be sure to connect

the pressure to be mea sured to the high pressure port

on the Quick Select pressure module. For temperature

mea sure ment, connect the RTD probe to be used to

the Switchcraft connector on the interface module and

proceed to Section 16.1 for instructions on setting up the

MDI system for tem per a ture measurement.

There are additional set up operations that can be per-

formed to increase the overall capabilities of the MDI

ing the MDI system on and depleting

bat ter ies in

battery option.

2 – Setting up battery level indication so that an es ti mate

of the remaining battery life can be

viewed at

the push of a button. Alkaline only see section 3.5.2 for

details.

3 – Programming the date and time for use in date

Section 3.5 Optional System Start Up Procedures

Page 11

Revision 4.3 3/2004

ing time delayed data logging on MDI units with the

optional data logging ca pa bil i ty.

in for ma tion is only main tained in units with the data

log ging op tion.

4 – Programming owner/operator information for

dis play on the MDI to facilitate tracking of in-house

in stru men ta tion.

The following subsections provide information on the

above listed start up procedures.

Section 3.5.1 Auto Off – Battery Save Function

The MDI system can be set up to automatically turn

itself off if no keypad activity is detected for a 10 minute

time period. This capability will protect MDI system

being powered off the optional nickel cad mi um batteries

from accidental depletion of the batteries.

The following procedure is used to activate or disable

the battery save function.

Step 1

With the MDI system on and reading pres sure

press the SET UP key.

Step 2

Using the arrow keys select the battery save

function (designated BatSave in the set up menu). When

Step 3

With the “BatSave” text  ashing press the

enter key.

Step 4

Using the left or right pointer select Disable or

Enable, as desired. When selected the text will  ash.

Step 5

With the word “Enable”  ashing press enter to

activate the battery save function.

If Enable is selected the MDI system will au to mat i cal ly

turn off if there is no keypad activity detected for a

period of 10 minutes. If Disable is selected the MDI sys-

tem will remain on continuously as long as an adequate

power supply is available. The system, if being operated

off the nickel cadmium batteries, will continue operation

until the battery voltage is no longer suf  cient to power

the system.

The battery save mode selected is stored in Elec tri cal ly

Erasable Pro gram ma ble Read Only Memory (EE-

PROM). As such it does not require re pro gram ming on

power up.

The MDI indicator is available with a choice of built-in

battery power options. These are:

2– Built-in NiCad power pack and charging circuitry.

T he two options are mutually exclusive and must be

two battery types is different and is detailed below.

Battery Life*

Time in Hours

NiCad

Alkaline

Pack

Standard Operation

Total available time with:

Backlight on

4.5

3.25

Optional Loop supply (no load)

Optional Loop supply (12mA load)

4.5

Backlight & loop supply (no load)

2.5

Backlight & loop supply (12 mA load)

nominal temperature of 70 degrees Fahr en heit. Use of the MDI prod-

uct at tem per a ture signi cantly less than 70 degrees Fahrenheit will

adversely effect battery life.

Important Note:

Due to the extreme variation in battery

life under different operating conditions (backlight on

or off or loop supply in use, it is rec om mend ed that the

battery voltage value be used to de ter mine when replace-

ment of batteries is warranted.

The MDI System provides advanced warning of a low

battery condition. The low battery warning icon, which

looks like a miniature battery will  ash in the center of

the top line of the display when the mea sured battery

voltage drops to 5.6 Vdc. The MDI system will continue

to function properly with the low battery icon  ashing.

To ensure un in ter rupt ed measurement capability it is

recommended that the batteries be recharged (NiCad)

or replaced (alkaline) as soon as possible after the low

battery icon appears. When the mea sured voltage drops

to 5.4 Vdc, the low battery icon will  ash on the display

and the MDI system will turn itself off after 15 sec onds.

If the measured voltage drops below 5.2 Vdc the MDI

(BatSave)

Section 3.5.2 Battery Life of Optional Battery Power Feature

Section 3.5.3 Low Battery Icon

Page 12

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Summary of low battery warnings:

5.6 Vdc: Low battery icon appears

5.4 Vdc: Low battery icon remains on display,

unit powers down after 15 seconds.

5.2 Vdc: Pow er up not allowed

It is estimated that the user will have between 30 and 45

minutes of battery life remaining (without the backlight

option on) when the low battery icon initially appears.

Actual battery life remaining will vary based on tasks

being per formed and ambient op er at ing temperature.

Section 3.5.4 Programming Date & Time

If the unit does not have the Data Logging option skip

this section. The date/time function supports date/time

recording capability that can be used in association with

the Data Log option.

Note:

MDI units without the data logging option have

no requirement for date/time data and will not keep track

of the date and time when pow ered down.

For various application oriented functions the use of a

real time clock will be required. Setting the real time

clock is a simple process and should be done when the

MDI system is received.

The real time clock may be set

using the following procedure.

Step 1

With the MDI system on and displaying mea-

sure ment data press the SET UP key.

Step 2

Using arrow keys move through the menu

DateTime will  ash on the display when selected.

Step 3

With the words “DateTime”  ashing press the

enter key.

This will activate the date time setup screen that looks as

follows:

where:

the last 2 digits of the current year

the month

(01 for Jan. through 12 for Dec.)

DD =

the day of the month

(01-31 for day of the

month)

HH =

the current hour using military time

where:

0800 =

noon

2000 =

MM =

minutes (from 0 to 60)

SS =

Setting the current date and time is accomplished by us-

ing the keys with the corresponding numerical values.

From left to right enter the appropriate number in each

of the  eld positions using the numeral keys. Once a

given  eld has had the number entered, the MDI system

will automatically index to the next position for entry.

When completed the date/time information should look

as follows:

For a date/time of October(10), 3

day (03), 1996 (96) at

a time of 11:15 AM (1115), and 0 seconds (00).

When the correct time/date information has been entered

press the enter key.

Time/date information is stored in battery backed up

Random Access Memory (RAM). This information

time change has occurred, the MDI system is to be used

in a different time zone than the one in which it was in

during initial setup or when the lithium battery used to

back up the RAM needs replacement (every 1-2 years

depending on the environmental conditions under which

the MDI system is used).

RAM memory is only supplied if unit is purchased with

data logging option. Time/date information is not main-

tained in MDI units without data log option.

The MDI system has the ability to display, on power

up, the name of the individual, department or com pa ny

responsible for its use or maintenance.

The following steps are to be followed to input user

Step 1

With the MDI system on and reading pres sure

press the Set Up key, designated SET UP.

Information

Section 3.5.5 Input of Owner/Operator In for ma tion

Page 13

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Step 2

Using the arrow keys, select the Owner func-

tion from the setup menu. When selected the word

“Owner” will  ash on the display.

Alarm

Step 3

With the word “Owner”  ashing press the enter

key.

Step 4

After pressing ENT the display will read:

Step 5

A  ve digit owner access code was provided

with your instrument at the time of shipment. The owner

codes are included on the calibration cer ti  ca tion sheet

for the MDI base unit. Use the number keys on the MDI

to right.

Note

pro gram ming  eld and the other provides access to the

calibration data and recerti cation programming. Please

be certain to select the correct password. These pass-

words are not interchangeable.

If, at any time during the entry process you enter a

number in error, press the CE key to clear the entry and

restart the access code entry process.

If the password codes have been lost, contact your

calibrator supplier. The serial number of the base unit

is re quired for the factory to provide product pass word

in for ma tion.

Step 6

With the proper access code displayed press the

enter key.

If an incorrect access code is entered the MDI system

will respond:

To restart the entry process after the “access denied”

response re-enter the owner set up function through the

Step 7

After entry of the proper access code the dis-

play will read:

To enter a new owner name use the up and down arrows

to scroll through the al pha nu mer ic entries and the left

and right arrows to move the active entry  eld (cursor)

to the next location.

A blank can be inserted by using the down arrow with

the letter A  ashing on the display. Continuing to press

the down arrow after the blank appears will provide

access to numerical values starting at 9 and decreasing

to 0. The label may contain al pha bet i cal, numerical or a

com bi na tion of both types of entries.

To review:

Up/down arrows provide access as follows:

0, 1, 2, 3, 4, 5,

6, 7, 8, 9, _, A,

B, C, D, E, F, G,

H, I, J, K, L, M,

N, O, P, Q, R, S,

T, U, V, W, X, Y, Z

By maintaining pressure on the up/down arrow the dis-

played number or letter will continue to change until the

last character has been reached.

By pressing and releasing the up/down arrow a single

The left/right arrow keys allow for entry of alpha nu-

meric data in any of the available positions.

Step 8

After the desired operator information has been

keyed the display will look as follows:

Step 9

After the desired owner/user information has

been entered and is displayed press the enter key.

The MDI system will respond:

Step 10

To store the owner/user information dis played

press the ENT key. Pressing the CE key will return the

MDI system to the measurement mode. If entry of new

owner information is still required restart the process as

outlined in steps 1-9 above.

Owner information is stored in Electrically Erasable

Programmable Read Only Memory (EEPROM). This

information should only need to be changed or re-entered

when the owner/user changes.

Page 14

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Section 3.6 Removing Quick Select Pressure or

Changing Quick Select pressure modules, therefore

changing the measurement ranges in use, is quick and

easy. Simply follow the steps below to ac com plish the

desired change.

Step 1

Using the on/off key on the keypad of the base

unit turn the power to the base unit off.

Step 2

With one hand, hold base unit with the back

panel facing the operator.

Step 3

Press the black tab on the side of the MDI case

corresponding to the side of the Quick Select module to

be removed.

Step 4

Maintain pressure on the black retaining tab

and with your other hand  rmly grasp the pressure mani-

fold or, with temperature and calibration mod ules, the

con nec tor mounting tab, that extends from the end of the

Quick Select module and slide (pull) the module out of

the module bay.

To protect from dirt or other debris

getting into the base unit a module should be installed in

both module bays. If only one module is needed install

the System Pro tec tion Module (part number GQS-XS)

The MDI system has a great deal of functionality. Many

of the product capabilities are activated by dedicated

keys on the keypad. Other functions are either ac ti vat ed

or set up through a set up menu activated by pressing the

follows.

Key Designation

Func tion

Turn unit on and off.

Provides access to set up functions for

various on-board  rmware functions/ca pa -

bil i ties.

Used to select displayed measurement

data. Selection in cludes: read ing pres sure

from either one or both installed modules

as well as selection of reading pres sure

and elec tri cal mea sure ments si mul ta ne-

ous ly. (See Section 5.0 for details.)

ZERO

Pro vides ability to zero, either one or both,

Quick Select Mod ules. (See Section 6.0 for

details.)

Provides available voltage capacity of on-

board NiCad battery pack (if so equipped).

*ENG

Used to select desired engineering unit from

the following: psi, inHg, inWC, ftSW, Bar,

mBar, kPa, Mpa, mmHg, cmWC, mmWC,

kgcm, user. Where “user” is an operator

pro gram ma ble engineering unit, allowing

the display of any single en gi neer ing unit

not included in the above list. (See Section

Also note:

pressing and holding down the

ENG UNIT key will prompt the MDI In di -

ca tor to display the range and pressure type

of the module installed. Re leas ing the key

allows the unit to re sume normal

pressure mea sure ment operations.

Dis plays the minimum and maximum pres-

details.)

Al lows for sub trac tion of an op er a tor

mea sure ment value for one or two Quick

Select pressure modules. (See Section 9.0

for details.)

Provides ability to measure the  ow of a gas

in terms of velocity or volume. (See Section

Al lows testing for leaks in terms of pressure

decay over time or in terms of leak rate.

Provides set up capability for man-

u al or (OPTIONAL)automated data logging.

Provides ability to store measured

when MDI system is used in manual data

logging mode. (See Section 22.5 for details)

Freezes the displayed pres sure and elec-

tri cal mea sure ments. (See Section 10.0 for

details.)

Moves cursor up.

Provides access to pressure

 rmware. (See Section 18.0 for details.)

Activates back light function.

Moves cursor to the left.

Temperature Modules

Section 4.0 Key Function Overview

Page 15

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Activates or disables damping used to

data from the effects of low level pressure

transients. (See Section 12.0 for details.)

Moves cursor to the right.

Clears previous entry.

Changes electronic measurement display

from mA to V or V to mA and can also be

used to de ac ti vate ei ther side of the display.

Moves cursor down.

Converts display from pressure units to %

of f.s. (See Section 13.0 for details.)

Enters input data.

Notes on key functions:

of appropriate input  elds in the setup menu. Examples

of required input data include:

Damping:

Level of damping desired.

Unit Select:

Water reference tem per a ture or user (non

library) en gi neer ing unit entry can be

Leak:

Type of measurement (leak rate vs pres sure

decay), time to monitor and for leak rate

ap pli ca tions the volume of the vessel to be

mon i tored.

Input zero and span, output zero and span

and device type

(I/P, P/I, P/P, P/E).

The required data is input through the set up func tions

provided by the corresponding menu options accessed

and available by pressing the setup key.

Complete details of each of the above outlined ca pa -

bil i ties is included in the section referenced after the

function summary provided above.

Section 5.0 Port Select Function

The Port Select Key, designated PORT SEL, pro vides the

ability to select either of the two installed Quick Select

modules for display, both modules for display or either

a pressure/temperature module on one side and a current

or voltage measurement on the other side of the display.

For example, if the MDI system has two pressure mod-

ules installed and is reading in psi the standard display

for dual pressure readout would be:

psi

Pressing the Port Select key once will result in the fol-

lowing display change:

Pressing the Port Select key a second time will result in

the following display change:

Pressing the Port Select key a third time will result in the

display returning to a dual pressure readout mode. As

If the MDI system has a temperature measurement

interface module installed the same type of sequence

would be followed. For example, if the MDI system had

an RTD interface module installed in the left module bay

the following sequence would be ob served as a result of

pressing the PORT SEL key.

Pressing the Port Select key once will result in the fol-

lowing display change:

Pressing the Port Select key a second time will result in

the following display change:

Pressing the Port Select key a third time will result in

the display returning to a readout mode featuring the

mea sure ment data from both of the installed mod ules.

As seen below:

See 8.4 for display of pressure in two dif fer ent en gi -

neer ing units. See Section 7.0 for display of current and

voltage mea sure ment data.

This section applies to pressure measurement only. The

zero function does not apply to the function of tem-

per a ture measurement. The tare capability will function

in con junc tion with temperature mea sure ment modules.

This allows for the subtracting of a displayed or operator

entered temperature value from the displayed tem per a-

Section 6.0 Zero Function

Page 16

Revision 4.3 3/2004

ture mea sure ment data. See Section 9.0 for information

on the tare function.

Pressing the zero key when two Quick Select pres sure

modules are installed and displayed will si mul ta neous ly

zero both pressure modules. In addition, each module

can be zeroed independently, as out lined in the fol low ing

It is recommended that the instrument be

zeroed prior to use or calibration.

Section 6.1 Zeroing One of Two Installed Quick

If zeroing one of two installed modules is desired the

following process should be followed:

In this ex am ple we will assume that the left pressure

module is to be zeroed and the right module module is to

be un changed.

Step 1

Press the port select the number of times re-

quired (one or two) to deactivate the display of pressure

on the side that you wish

not

to re-zero.

When set up in accordance with the requirements of this

example the MDI system will have the fol low ing in for -

ma tion on the display:

Step 2

With the pressure display deactivated for the

ZERO

The MDI system will respond by displaying:

Step 3

To resume the display of pressure mea sure -

ment data, for the pressure module not zeroed, press

the port select key the required number of times (one or

two) to restore the dual pressure display.

When complete the MDI system will display:

Pressure measurement activity can now be resumed.

As outlined in the previous section the port select

on the display.

The display con gurations available are:

Left Side of Display

Right Side of Display

pres/temp

electrical mea sure ment

electrical measurement

pres/temp

The pressure/temperature value on the display cor-

re sponds with the measured value of the Quick Select

module installed in the module bay on the corresponding

To read a current or voltage follow the steps below.

Step 1

With the MDI system on and reading pres sure/

temperature set the display as outlined in Section 5.0 to

display the pressure measurement of the desired module.

Step 2

With the pressure measurement, for the de-

measurement on the other press the mA/V key until the

desired electrical measurement pa ram e ter appears. For

example, with a pressure module installed in the left

module bay, pressing the mA/V key will produce the

following results:

irst display when electronic measurement is ini ti at ed

through the port select function:

Result from pressing mA/V key  rst time:

Result from pressing mA/V key a second time:

Result from pressing mA/V key a third time:

Using the combination of the port select function and the

mA/V function any combination of mea sure ments can

be produced.

The MDI system is factory programmed to provide

pressure measurement in 12 engineering units. These

include; psi, inches of mercury, inches of water, feet of

of mercury, centimeters of water, mil li me ters of water

and killograms per square centimeter.

Pressure measurement data may also be displayed in a

user programmable non-library engineering unit. Section

Unit provides complete details on setting up an operator

de ned engineering unit.

Select Pressure Modules

Section 7.0 Displaying Current and Voltage

Measurements

Section 8.0 Engineering Unit Selection –

Pressure Measurement

Page 17

Revision 4.3 3/2004

Inch, centimeter and millimeter of water en gi neer ing

units may be set up for conversion at tem per a tures of 4

degrees and 20 degrees C or 60 degrees F. Consult Sec-

tion 8.5 H

O Reference Tem per a ture Selection to pro-

gram the desired tem per a ture for inches or cen ti me ters

of water con ver sions.

Section 8.1 Selecting a Factory Pro grammed

To select an engineering unit from the on-board library

follow the steps below:

Step 1

With the MDI system on and displaying pres-

This key is designated ENG UNIT.

The MDI system will respond by displaying the en gi -

neer ing unit library as follows:

 rst screen:

The engineering unit abbreviations correspond to the

fol low ing engineering units:

psi:

pounds per square inch

inHg:

inch es of mercury

inH

O: inches of water column*

ftSW:

feet of sea water

Bar:

bar

mBar:

millibar

kpa:

kiloPascals

mPa:

megaPascals

mmHg:

millimeters of mercury

cmWC:

centimeters of water column*

mmWC:

millimeters of water column*

kgcm:

kilograms per square centimeter

user:

user programmable engineering unit (see

Section 8.2 for details)

Consult Section 8.5 for details.

Step 2

Using the left/right and up/down arrow keys

text for the desired engineering unit will  ash.

In the preceeding example mBar is the selected unit.

Step 3

With the desired engineering unit  ashing press

the enter key.

The MDI system will respond by displaying the pres-

unit. If two Quick Select pressure modules are installed

both will be displayed in the selected engineering unit.

The MDI system can also display the measurement

data of two installed Quick Select pressure modules in

in de pen dent engineering units. Section 8.4 provides the

operation.

The MDI system has a user programmable en gi neer ing

unit available. This allows for the display of pressure

measurement data in an engineering unit that is not in

the library of the MDI system. Any unit of pressure mea-

sure ment that is linearly proportional to pressure change

can be programmed for use in the user en gi neer ing unit

 eld.

For this example, the pressure measurement unit of

mSW (meters of sea water) will be used as the desired

user engineering unit. To set the user en gi neer ing unit to

provide pressure measurement data in

mSW follow the steps below.

Step 1

With the MDI system on and reading pres sure

press the key designated SET UP.

Step 2

Us ing the arrow keys select the User en gi -

neer ing unit option displayed as “UserEng”. The text

“UserEng” will  ash when selected.

Step 3

With the text “User Eng”  ashing press the

en ter key.

Step 4

After pressing the enter key the MDI system

will respond by displaying:

Step 5

Enter the conversion factor required to convert

from psi to the engineering unit desired. For con ver sion

from psi to mSW the conversion factor is 0.684482. En-

Engineering Unit

Section 8.2 Setting up a Custom or User De ned Engineering Unit

Page 18

Revision 4.3 3/2004

ter 6 digits to provide the required resolution to support

the accuracy of the MDI system . Appendix B provides a

list of conversion factors.

Use the number keys to enter the desired conversion

factor, entering the required factor from left to right. For

our example of mSW the conversion factor is 0.684482

and the display should read:

If an incorrect conversion factor is entered press the

clear entry key, designated CE, to re-initiate the entry

process for the correct factor.

Step 6

When the correct numerical value appears on

the display press the enter key.

After entering the conversion factor the MDI system will

respond by displaying:

Step 7

Enter the name of the engineering unit se lect ed,

abbreviated to 6 characters or less. For our example mSW

is a 3 character abbreviation for meters of sea water.

This abbreviation will  t in the 6 digit  eld. To enter the

mSW engineering unit label use the up and down arrow

keys to increment or decrement through the alphabet/

numerical values and the left and right arrows to move

the active entry  eld (cursor) to the next location.

If needed for the desired engineering unit, a blank can be

inserted by using the down arrow with the letter A  ash-

ing on the display. Continuing to press the down arrow

after the blank appears will provide access to numerical

values starting at 9 and de creas ing to 0. The label may

contain alphabetical, numerical or both types of entries.

To review:

Up/down arrows provide access as follows:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, _, A, B,

C, D, E, F, G, H, I, J, K, L, M, N,

O, P, Q, R, S, T, U, V, W, X, Y, Z

By maintaining pressure on the up/down arrow the

display number or letter will continue to change until the

last character has been reached.

By pressing and releasing the up/down arrow a single

increment or decrement between letters or numbers can

be accomplished.

The left/right and up/down arrow keys allow for entry of

letters or numbers in any of the available label positions.

Step 8

For this example, after the engineering unit

label has been keyed the display will read:

Step 9

With the desired engineering unit label dis-

played press the enter key.

After the enter key has been pressed the MDI system

will resume normal pressure measurement in the original

engineering units. Instructions on how to use the custom

engineering units are provided in the fol low ing section.

Section 8.3 Using A Custom Engineering Unit

After a custom engineering unit has been pro grammed it

may be used by following the steps below. For in for -

ma tion on programming a custom engineering unit refer

to Section 8.2 Setting up a Custom or User De ned

En gi neer ing Unit.

To display pressure measurement data in the user en gi -

neer ing unit:

Step 1

With the MDI system on and measuring pres-

sure press the engineering unit key. Designated ENG

UNIT on the keypad.

The MDI system will respond by displaying:

First screen:

Second screen:

Step 2

Using the left/right and up/down arrow keys

will  ash.

Step 3

With the word “user”  ashing press the enter key.

The MDI system will respond by displaying pressure

measurement data in the following display format:

where:

Page 19

Revision 4.3 3/2004

u_ indicates that the engineering unit in use is a user

de ned unit with a label of mSW

xxxxxx represents the current pressure measurement(s)

in the user engineering unit.

See Section 8.4 Display of Two Engineering Units for

information on how to simultaneously display the mea-

sured values from two Quick Select pressure modules in

different engineering units.

Section 8.4 Display of Two Engineering Units

The MDI system can display pressure measurement data

from two installed Quick Select pressure mod ules in

independent engineering units. To display two dif fer ent

engineering units si mul ta neous ly the following pro-

ce dure should be followed.

Step 1

With the MDI system on and displaying pres-

modules press the engineering unit key des ig nat ed ENG

UNIT on the keypad.

Step 2

Using the arrow keys select either of the two

desired engineering units. For this example we will

With psi selected the text “psi” will  ash on the display

and the display will look as follows:

Step 3

Press the enter key to select psi.

The MDI system will respond by returning to the pres-

sure measurement mode and will display the mea sure -

ment data for both Quick Select pressure modules in psi,

as follows:

Step 4

Next, press the port select to deactivate the

display of pressure measurement data on the side that

you wish to maintain pressure measurement in terms of

psi. A pressure display is deactivated when the cor-

re spond ing side of the display contains milliamp (mA)

data, Voltage (V) data or is blank “ ------ ”.

See Section 5.0 for details on the port select func tion.

In this case we will assume that the right side will

remain in psi and our goal is to present the mea sure ment

data from the left Quick Select pressure module in bar.

Pressing the port select one time will deactivate the left

pressure display converting it to a mA mea sure ment

 eld. Pressing the port select a second time will de ac -

ti vate the right side, converting it to a mA mea sure ment

 eld and returning the left side of the display to the

function of pressure measurement.

Since we want the right side to remain psi we will de ac -

ti vate it in the psi mode by pressing the port select key

once.

The MDI system will respond with the following dis-

play:

Step 5

With the right side deactivated from pres sure

measurement activities press the engineering unit key,

designated ENG UNIT on the keypad.

The MDI system will respond by displaying:

Using the arrow keys select the desired engineering unit

for the left side. In this example we have opted for the

engineering unit of Bar. With the Bar en gi neer ing unit

“Bar”  ashing:

Step 6

With the desired engineering unit selected

The MDI system will respond by displaying the following:

Step 7

Reactivate the right side of the display for pres-

as required.

First press of the port select key.

MDI system will respond by displaying the fol low ing:

Page 20

Revision 4.3 3/2004

Second press of the

MDI system will respond by displaying the fol low ing:

psi

Using this process, any engineering unit may be selected

for display of the right or left Quick Select pressure

module measurement data.

Section 8.5 Temperature Selection for H2O

The MDI system includes a library of 12 factory pro-

grammed engineering units. This selection includes the

engineering units inH

O, mmH

O and cmH

O. The pres-

temperature of the water.

Over the years, several temperature references have

evolved into industry standards. These are the con ver -

pressure instruments when calibrating pressure mea-

sure ment devices in terms of the height of a column of

water. To facilitate your calibration and test of these in-

stru ments, the MDI system includes 3 conversion factors

for each of the water column based pressure engineering

units. The conversion factors are for the temperatures of

4 and 20 degrees Celsius and 60 degrees Fahrenheit. The

factory default setting is 20 degrees C.

The selection of the desired temperature for use in the

conversion of water based pressure mea sure ments can be

accomplished by following these steps.

Step 1

With the MDI system on and reading pres sure

press the SET UP key.

Step 2

Using the up/down and left/right arrow keys

O reference option displayed as “H

Oref”

in the set up menu. When selected the text “H

Oref” will

 ash on the display.

Step 3

With the text “H2Oref”  ashing press the

enter key.

The MDI system will respond by displaying:

Step 4

Using the left/right arrow keys select the de-

value will  ash on the display.

In the above example the conversion factor for water at

60 degrees Fahrenheit was selected.

Step 5

With the desired temperature for the con ver sion

factor  ashing press the enter key.

The selected conversion temperature will be ac ti vat ed

and will be stored in Electrically Erasable Pro gram -

ma ble Read Only Memory (EEPROM). It will not have

to be reentered on power-up unless a change in the refer-

ence temperature is desired.

After pressing the enter key the MDI system will resume

basic pressure measurement.

The MDI system has the ability to tare (subtract an

operator selected value) from the displayed pressure or

temperature measurement value of either one or two

installed Quick Select modules. This is most commonly

required in applications where a pressure pre-load, as

in a weighing application, must be subtracted from the

displayed pressure mea sure ment.

If the MDI system is in use with two Quick Select mod-

ules, independent tare values can be entered for each of

the module modules. If one of two installed Quick Select

modules has been deactivated, meaning the measured

values are not shown on the display, the MDI system

will request a tare value only for the active module. To

input a tare value for one or two Quick Select pressure

modules follow the steps below.

Step 1

With the MDI system on and displaying pres-

TARE

The MDI system will respond by displaying the fol low ing:

If tare was active the previous value in use will be

displayed. If the previous tare value was zero the MDI

Conversion Factor

Section 9.0 Tare Function

Page 21

Revision 4.3 3/2004

to press ing the TARE key.

Step 2

Use the number keys to input a tare value other

than the default value or to change the existing tare

value. If no tare value is desired input zero (0).

Failure to enter the zero (0) will result in the

MDI system automatically accepting the last dis played

value as the desired tare value.

Step 3

With the desired value displayed press the

enter key.

The MDI system will respond by displaying the fol low ing:

Step 4

Use the number keys to input a tare value other

than the default value or to change the existing tare

value. If no tare value is desired input zero (0).

Failure to enter the zero (0) will result in the

MDI system automatically accepting the last dis played

value as the desired tare value.

Step 5

With the desired value displayed press the

enter key.

Note

the MDI system is operating in the tare mode.

After pressing the enter key the MDI system will resume

normal pressure measurement activities. Tare values

may be reviewed at any time by pressing the TARE key.

If the MDI system is being used with two Quick Select

modules and only one module has a nonzero tare value

the display will only  ash on the side that corresponds to

the Quick Select module with the nonzero tare value.

Step 6

To exit the tare mode follow the procedures out-

lined in steps 1 through 5 and at the tare value prompt

enter zero (0). When the tare values for both modules

have been reset to zero tare mode operation will be dis-

con tin ued and the display will stop  ash ing.

The hold function provides the ability to freeze the dis-

played pressure,  ow or electrical measurement values.

In addition, pressing the hold key will result in an H

appearing in the RS232 output data stream and will also

result in a  ashing H appearing on the left side of the top

line of the instrument display.

The RS232 output will look as follows for a dual module

measurement:

Normal Operation

+1.2345 inH

O +1.2345 inH

Left Min: +0.00000 Max: +1.2345

Right Min: +0.0000 Max: +1.2345

With Hold Function Invoked

+1.2345 H inH

O +1.2345 inH

Left Min: +xxxxx.x Max: +xxxxx.x

Right Min: +xxxxx.x Max: +xxxxx.x

Section 10.1 Using the Hold Function

Step 1

To invoke the hold function press the hold key.

The MDI system will respond by freezing the dis played

values and adding a  ashing “H” that will appear in the

left most position on the top line of the display.

Step 2

To exit the hold function press any key.

Note

enabled, the MDI system will continue to transmit the

displayed values.

The MDI system monitors and stores in memory both

the minimum and maximum pressure or tem per a ture

values measured. The fol low ing procedure will allow

review of these values.

Step 1

To recall the minimum and maximum values

The MDI system will respond by displaying:

where:

max i mum values are displayed on the top line

and +12345 represents the maximum value(s) measured.

Minimum values are displayed on the bottom line and

-12345 represents the minimum value(s) measured.

If two Quick Select modules are installed, the min/max

function recalls and displays the minimum and max-

i mum values for both modules simultaneously.

Step 2

To clear the stored minimum and maximum

value press the clear entry key:

Section 11.0 Minimum and Maximum Value

Tracking

Section 10.0 Hold Function

Page 22

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Pressing any key other than the CE key will main tain the

stored values in memory.

Pressing any key on the keypad will return the MDI

Section 12.0 Damping

Damping provides the ability to stabilize the dis played

or transmitted pressure value by minimizing the effects

of low level transients and electronic instability. Damp-

ing is most commonly used with Quick Select pressure

modules to overcome the effects of pressure pulsation

and vi bra tion trans mit ted through the measurement

media. The level of damp ing is established in the set

up menu. Activation of the damping process is ac com -

plished through a dedicated key on the keypad.

Damping accomplishes the stabilization of the pressure

measurement value by producing an av er aged pressure

value which is shown on the display and available for

transmission over the RS232 interface. When damping is

not activated the MDI system takes a new pressure value

approximately every 130 to 240mS (7.5/per second on

average) and updates the display. If re quired, this same

mea sure ment data is also trans mit ted via the RS232

in ter face.

When damping is activated the value displayed and/or

transmitted is an average value. The average consists

of the average of from 1-16 consecutive readings. The

higher the number of readings av er aged the greater

the sta bi li za tion effect of the damp ing. The number of

consecutive readings averaged is pro gram ma ble, allow-

ing the damping function to be tailored to the speci c

re quire ments of most any application.

The following steps should be used to set up the level of

damping desired.

Step 1

With the MDI system on and reading pres sure

press the SET UP key.

Step 2

Using the arrow keys move through the set up

menu and select “Dampen” on the display of the MDI

when selected.

Step 3

With the word Dampen  ashing press the

enter key.

Step 4

In response to the activation of the damp en ing

the following:

Where the left most position represents zero damp ing

maximum damping (averaging of 16 readings). Starting

from the left each movement of the high light ed box to

the right increases the number of samples being av-

er aged by one (1). By moving the highlighted  eld to the

left the level of damping can be reduced.

The level of damping desired will likely vary from appli-

cation to application and module range to module range.

For best results, select the minimum amount of damping

necessary to provide a stable display value. It is impor-

tant to recognize that while damp ing will stabilize the

displayed and/or trans mit ted value it will also slow down

the response rate to a true pressure change. The slow

down results from the fact that an averaged value will be

displayed. If the damping level is set to 16 the displayed

value will represent the average pressure measurement

over the previous

approximately

2.1 seconds (16 read-

ings times 130mS/reading). There fore, the greater the

level of damping in use the greater the time lag will be

between the displayed measurement and the true (not

averaged) pressure measurement value.

Note

measurement parameter on one side of the instrument

display.

Use the left/right arrow keys to set the desired damp ing

level, for example, averaging 8 readings as shown here.

Step 5

With the desired level of damping shown press

the enter key to store the damping level in EEPROM.

The level of damping has now been set. Proceed to Sec-

tion 12.2 for instructions on how the damping process is

activated.

The following process provides step by step in struc tions

on how to activate or discontinue the damping function.

Step 1

Once established in the set up menu the damp-

ing process may be enabled or disabled through the use

Section 12.1 Set Up of the Damping Function

Section 12.2 Activating or Discontinuing the

Damping Function

Page 23

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of the DAMP key on the keypad. To activate/deactivate

the damping function press the DAMP key on the key-

board.

In response to pressing the DAMP key the MDI system

will respond by displaying:

Step 2

Using the left or right arrow select “Disable” to

turn damping off or “Enable” to initiate damping. When

the desired option is selected ( ashing) press the enter key.

On power up the MDI system will default to damp ing

disabled.

Damping must be re-initiated via the keyboard

after the instrument has been turned back on

of damping, established in the set up menu is stored in

EEPROM and, therefore, does not need to be re pro -

grammed after power up unless the level of damping

desired has changed

Section 13.0 Percent Function

The percent function allows the MDI system to display

the output from a device under test in terms of percent

error at a given percentage of the total range. This func-

tion applies to the calibration of both temperature and

pressure transmitters. For example, if the MDI system

is being used to calibrate a 0-100 psi trans mit ter with a

4/20 mA output the MDI system can be pro grammed to

display the following data:

Pressure

Nor mal

Ap plied

Dis play Mode

0 psi

25 psi

50 psi

75 psi

20 mA

The percent mode of operation allows for quick and easy

determination of the level of inaccuracy of the device

under calibration. For example: If 50 psi was applied to

a 100 psi device with a 0-10 Vdc output but instead of

5 Vdc the transmitter being calibrated had an output of

4.995 Vdc the MDI system, when used in the percent

mode, displays the fol low ing:

Therefore, the percent mode of operation eliminates the

need for operator calculations to determine the level of

accuracy of the device under test.

If the MDI system is equipped with the data logging op-

tion the percent error and percent full scale in for ma tion

can be stored in the MDI system on-board memory. To

do this follow the set up in struc tion provided in Section

22.5 Manual Data Logging.

Note

Vdc built-in loop power supply. This supply can be used

to power transducers, transmitters and switches during

calibration and test operations. If the MDI indicator is

to be powered by the battery option, Section 3.2 of this

manual should be con sult ed for the effects of the loop

power supply on battery life.

The percent function is set up as follows:

Step 1

With the MDI system on and reading pres sure

press the SET UP key.

Step 2

Using the arrow keys select the text “PerCent”

from the setup menu. When selected the text “PerCent”

will  ash on the display.

Step 3

With the text “PerCent”  ashing press the

enter key.

The MDI system will respond by displaying:

Step 4

Using the number keys enter the lowest cal i -

bra tion point for the device to be tested.

For example:

For a 0-100 inH

O range instrument enter 0.

For a –5 to 0 to +5 inH

O transducer enter –5.

For a 0-200 degree RTD enter 0

When the desired “zero” value has been entered the

display will look as follows for the testing of a 0-100 in

O transducer.

If an incorrect value is entered use the CE key to clear

the entry and re-key the zero value. With the desired

“zero” value displayed press the

en ter key.

Section 13.1 Set Up of the Percent Function

Page 24

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The MDI system will respond by displaying:

Step 5

Using the number keys enter the full scale

range (F.S.) of the device to be calibrated. For our

example of a 0-100 in H

O range instrument the display

will look as follows:

Step 6

With the desired input full scale displayed press

the enter key.

The MDI system will respond by displaying:

As with input zero, the output zero is the lowest output

the device being calibrated will produce.

For example:

For a 0-10 Vdc output device enter zero.

For a 4/20 mA output device enter 4.

For a 1-5 Vdc output device enter 1.

Step 7

With the desired output “zero” keyed in and

displayed press the enter key.

The MDI system will respond by displaying:

Step 8

Using the number keys enter the full scale out-

put of the device being calibrated. For a 0-10 Vdc output

device the display will look as follows:

Step 9

With the desired full scale output displayed

press the enter key.

The MDI system will respond by displaying:

Using the left/right arrow keys select the appropriate

device type where:

I/P

is a current to pressure device

P/I

is a pressure or temperature to current device

P/P

is a pressure to pressure device

P/E

is a pressure or temperature to voltage device

In this case we are testing a 0-100 inH

O range trans-

duc er that produces a 0-10 Vdc output from zero to

F.S. There fore, the appropriate selection is P/E and the

display will look as follows:

Step 10

With the desired device type  ashing press the

enter key.

At this time the system will return to measurement

activities.

Section 13.2 Use of the Percent Function

Note

Quick Select module is active and so that the desired

electronic measurement is displayed prior to entering the

rent & Voltage Measurements for setup details.

Step 1

With the percent function set up, press the %

key on the keypad of the MDI system to activate the

percent mode of operation.

Step 2

Connect the output lines from the device under

test to the inputs jacks on the front of the MDI. . Use the

mA and COM jacks for current devices and the V and

COM jacks for voltage output devices.

Step 3

Make the necessary plumbing connections to

allow input of applied pressure to both the MDI system

and the device under test.

Step 4

Per form testing in accordance with the number

of calibration points required for the device to be tested.

Step 5

To exit the percent mode press the percent key.

The MDI system will respond by returning to basic pres-

The MDI system used in conjunction with a pitot tube or

an annubar has the ability of measuring the  ow volume

or  ow velocity of a clean dry gas. The MDI system must

be used with a GQS-1 low dif fer en tial pressure Quick

Select module to perform the  ow measurement func-

tion.

The accuracy of a  ow measurement is a function of

a number of contributing factors. These are; the basic

accuracy of the differential pressure measurement, ac-

Section 14.0 Flow Velocity and Flow Volume

Measurement Back ground

Page 25

Revision 4.3 3/2004

curacy of the pitot tube or annubar in use as it relates to

the K factor supplied by the manufacturer of the device

and the accuracy of the correction being made for the air

density. It is not possible for your instrument supplier

personnel to provide an all in clu sive ac cu ra cy state-

ment for  ow measurement activities. Steps that can be

taken to maximize system  ow measurement accuracy

include:

– Calculation and input of the actual air density for the

media to be measured. The air density is a func tion of

temperature, hu mid i ty, barometric pressure.

The velocity equation (ft/min) is as follow:

V = 1097 x K

dpw

Adw

where:

dpw = differential pressure in inches of water

Adw = the air density

The air density can further be calculated through em-

ploy ing the following equation:

= 0.07649 x ( Pa/14.73) x [520/(T+460)]

where:

Pa = the absolute pressure in duct in psia

T = air temperature in duct in degrees Fahrenheit

Flow Volume = (velocity x duct area)/144

– Purchase of a characterized and certi ed pitot tube

or annubar with a K factor determined for the spe-

ci c probe to be used.

– Purchase of the highest accuracy dif fer en tial pres-

In preparation to perform  ow velocity and volume

measurements the operator should have the fol low ing

information available for entry during the set up of the

application on the MDI system .

K factor:

Provided by the manufacturer of the  ow

probe to be used.

Air density:

A default value has been pro grammed into

the MDI system in the event that a more

accurate one cannot be calculated.

Duct area :

For air volume measurement the area of

the duct in which mea sure ments are to be

taken must be calculated.

A GQS-1 differential type (dual process con nec tion)

mea sure ment activities.

Basic keypad functions such as damping, tare, min/max

recall, mA/V measurement display, battery check, dis-

play hold, data logging, zero and port select are avail-

able for use during  ow mea sure ment activities. Consult

the appropriate sections of this manual for information

on the set up and use of these product functions.

For  ow measurement follow the steps outlined in the

Section 14.2 Flow Velocity Measurement

Step 1

With the MDI system on and displaying pres-

The MDI system will respond by displaying:

Step 2

To perform  ow velocity measurements select

the word velocity using the left/right arrow keys. When

Step 3

With the word Velocity  ashing press the

enter key:

The MDI system will respond by displaying:

Step 4

Using the number keys input the required air den-

Step 5

With the required air density value displayed

press the enter key.

The MDI system will respond by displaying:

The  ow coef cient or K factor is a value speci c to the

pitot tube or annubar to be used. Consult the man u -

fac tur er of the annubar or pitot tube for the K factor

for your  ow probe. A default value of 0.6 is factory

programmed into the MDI system  rmware. This value

can be over writ ten, with a K factor for the speci c  ow

measurement probe, to optimize  ow measurement ac-

curacy.

Step 6

Connect the pitot tube or annubar to the Quick

)

Section 14.1 Set Up for Flow Velocity and Flow

Volume Mea sure ment

Page 26

Revision 4.3 3/2004

Select pressure module, as indicated in the man u fac -

tur ers manual for the  ow probe, high side to the high

pressure port on the Quick Select pres sure module and

low side to the low pressure port on the Quick Select

module.

Place the probe in the duct as instructed in the probe

manual. The MDI system will now display the mea sured

differential pressure in terms of  ow velocity.

Press the Clear Entry Key (CE) to exit  ow mea sure -

ment and return to pressure measurement.

Section 14.3 Engineering Units for Flow Ve loc i ty

As with standard pressure measurement the MDI system

can provide  ow velocity in a variety of units of mea-

the steps below.

Step 1

With the MDI system operating in the  ow

velocity mode (refer to Section 14.1 for instructions on

entering the  ow velocity mode) press the en gi neer ing

unit key.

The MDI system will respond by displaying the fol low ing:

These are the 6 units of measure available for display of

 ow velocity.

Step 2

Using the left/right and up/down arrow keys se-

lect the desired unit of measure. When selected the unit

of measure will  ash. In this example the en gi neer ing

unit of ft/sec has been selected.

Step 3

With the desired unit of measure  ashing, press

the enter key.

After pressing the enter key the MDI system will resume

measuring  ow velocity in the selected unit of measure.

Note

must  rst set up the measurement parameters re quired

for  ow velocity. Failure to do this will result in the

MDI system accessing the previously stored input data

on air density and K factor in the gen er a tion of the  ow

volume mea sure ment.

Step 1

With the MDI system on and displaying pres-

The MDI system will respond by displaying:

Step 2

Using the left/right arrow keys select the word

volume. When selected the word will  ash.

Step 3

With the word Volume  ashing press the

enter key.

The MDI system will respond by displaying:

Step 4

Calculate the area of the duct for which  ow

volume is to be determined. The equations for area cal-

culations are as follows:

For rectangular or square ducts:

area (square inches) = W x H

where:

W = width of the duct in inches

H = height of the duct in inches

For round ducts:

area (square inches) = (

/4 )D

where:

= 3.141592

D = di am e ter of the duct in inches

Step 5

Using the number keys input the area value

calculated in step 4.

Step 6

With the appropriate area value displayed press

the enter key.

If an incorrect area value is keyed press the clear entry

The MDI system will now be set up to provide  ow

volume measurement data for the desired duct.

To Exit Flow Volume Measurement and Return to Basic

Pressure Measurement Press the Clear Entry Key (CE).

Section 14.4 Flow Volume Measurement

Page 27

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When in the  ow volume mode the engineering unit

Step 2

Using the arrow keys select either of the two

desired engineering units. For this example we will

Step 3

With one of the two engineering units to be

used selected and  ashing, in this example ft/min, press

the enter key.

The MDI system will respond by returning to the  ow

measurement mode and will display the mea sure ment

data as follows:

Step 4

Next, press the port select to deactivate the

display of  ow measurement data on the side that you

wish to maintain displayed measurement data in terms

of ft/min. A pressure display is deactivated when it is re-

placed by a milliamp (mA), Voltage (V) or a blank (----).

See Section 5.0 for details on the port select func tion.

In this case we have decided that the left side of the

display will be in meters/second and the right side will

remain in ft/min.

Pressing the port select one time will deactivate the left

pressure display converting it to an mA mea sure ment

 eld. Pressing the port select a second time will de ac -

ti vate the right side, converting it to an mA mea sure ment

 eld and returning the left side of the display to the

function of  ow measurement.

Since we want the right side to remain ft/min we will

deactivate it in the ft/min mode by pressing the port

The MDI system will respond with the following display:

Step 5

With the right side deactivated from  ow mea-

Section 14.5 Engineering Units for Flow Volume

As with standard pressure measurement the MDI system

can provide  ow volume measurements in a variety of

velocity follow the steps below.

Step 1

With the MDI system operating in the  ow

volume mode (refer to Section 14.4 for instructions on

entering the  ow volume mode) press the en gi neer ing

unit key, designated ENG UNIT.

The MDI system will respond by displaying the fol low ing:

These are the 4 units of measure available for display of

 ow volume.

Step 2

Using the arrow keys select the de sired unit of

measure. When selected the unit of measure will  ash.

In this example the en gi neer ing unit of ft3/sec unit has

been selected.

Step 3

With the desired unit of measure  ashing, press

the enter key.

After pressing the enter key the MDI system will resume

measuring  ow volume in the selected unit of mea sure.

The MDI system can display  ow measurement data

from two installed Quick Select pressure modules in

in de pen dent engineering units. In order to display two

different engineering units simultaneously the fol low ing

procedure should be followed. In this example we will

assume the operator is in the  ow velocity mode and

would like to present the measured values in ft/min on

the right side of the display and meters/second on the

left side of the display.

Step 1

With the MDI system on and displaying  ow

Select pressure modules press the en gi neer ing unit key,

designated ENG UNIT.

When in the  ow velocity mode the engineering unit

Section 14.6 Simultaneous Display of Two Flow

Measurements in Independent Engineering Units

Page 28

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The MDI system will respond by displaying:

Step 6

Using the arrow keys select the desired en gi -

neer ing unit for the data on the left side of the display. In

this example we have opted to display the  ow measure-

ment data on the left side in terms of meters/second rep-

resented by MeterSec on the display. With the MeterSec

en gi neer ing unit selected the text “MeterSec” will be

 ashing:

Step 7

With the text “MeterSec” selected and  ashing

press the enter key.

The MDI system will respond by displaying the fol low ing:

Step 8

Reactivate the right side of the display for  ow

measurement by pressing the Port Select key, as required.

First press of the

MDI system will respond by displaying the fol low ing:

Second press of the

MDI system will respond by displaying the fol low ing:

Measurement Press the Clear Entry Key (CE).

Using this process, any engineering unit may be selected

for display of the right or left Quick Select module mea-

Section 14.7 Simultaneous Display of

The MDI system can simultaneously display a  ow

measurement from one installed Quick Select pressure

module and a pressure measurement from a second in-

measurement of  ow can be displayed in ft/min for one

installed Quick Select pressure module and the second

installed pressure module can be used to si mul ta neous ly

display the measured value in terms of inches of water.

This ability elim i nates the need for “on-the- y” change

between  ow and pressure measurement func tions when

doing air ow testing.

To set the MDI system up to present simultaneous

display of pressure and  ow (velocity or volume) data

follow the steps below.

Step 1

With the MDI system on and displaying pres-

sure measurement data from both modules, if nec es sary,

the pressure measurement. This is done by accessing

the Engineering Unit library by press ing the ENG UNIT

key. Details on en gi neer ing unit selection are provided in

Section 8.0 of this manual.

Important Note:

The MDI system must be set up for

pressure measurement  rst. With pressure mea sure ment

pressure mode

prior

to setting up the desired  ow

measurement parameters. If  ow mea sure ment is set up

before pressure measurement access to pressure en gi -

neer ing units will be lost.

When set up to measure both pressure and  ow en gi -

neer ing units for both measurements can be accessed as

outlined in Section 8.4.

Step 2

Use the port select key to deselect the dis played

output of pressure from the module which is to be left in

the pressure readout mode of op er a tion. When a module

is deselected the corresponding side of the display on the

MDI system will read milliamp (mA), blank “-----“ or

Volts(V).

Press the port select key one time to deselect the right

module. Press the port select two times to deselect the

left module.

Step 3

With the desired pressure module deselected

follow the procedure outlined in Section 14.2 if the  ow

measurement is to be  ow velocity or Section 14.4 if the

 ow measurement is to be a  ow volume measurement.

Step 4

As outlined in Section 14.2 for  ow velocity or

Section 14.4 for  ow volume select the desired en gi -

neer ing unit.

Step 5

With the display for the active  ow mea sure -

Measurement Data for Flow (Volume or Velocity) and Pres sure

Page 29

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ment correct, reactivate the deactivated port using the

port select function.

Note:

The units used to express  ow measurement

may be changed at any time while the MDI system is

dis play ing any  ow measurement data. Simply use the

en gi neer ing unit select function as described in Section

Measurement Press the Clear Entry Key (CE).

Section 14.8 Simultaneous Display of

The MDI system can simultaneously display a  ow

measurement from one installed Quick Select pres-

sure module and a temperature measurement from a

mea sure ment of  ow can be displayed in ft/min for one

installed Quick Select pressure module and the second

installed pressure module can be used to simultaneously

display the temperature mea sure ment value in degrees

Celsius or Fahrenheit.

This ability eliminates the need for “on-the- y” change

between  ow and temperature measurement func tions

when doing air ow testing.

To set the MDI system up to present simultaneous dis-

play of temperature and  ow (velocity or volume) data

follow the steps below.

Step 1

With the MDI system turned off install the

required differential pressure module and RTD probe

interface module.

Step 2

Turn the MDI system on.

Step 3

As outlined in Section 16.1 set up the tem per a-

ture measurement function via the RTmodule submenu

accessed via the main Set Up menu. See Section 16 for

complete instructions on setting up the MDI system for

temperature mea sure ment using an RTD temperature

probe.

Step 4

With the side of the display to be used for  ow

measurement active and reading the measured pres sure

from a dual process connection type Quick Select pres-

Proceed as directed in Section 14.2 for  ow velocity and

Note 1:

The units used to express  ow measurement

may be changed at any time while the MDI system is

displaying any combination of  ow and tem per a ture

measurement data. Simply use the engineering unit

velocity and Section 14.4 for  ow volume.

Note 2:

Units for display of temperature mea sure ment

data can be changed at any time via the “RTmodule”

or “TCmodule” menu in the setup menu of the MDI

Measurement Press the Clear Entry Key (CE).

The MDI system can simultaneously display  ow

measurement data from two installed differential low

pressure Quick Select modules with one output dis-

played in terms of  ow volume and the other pressure

mea sure ment displayed in terms of  ow velocity. For

example, the measurement of  ow can be displayed in

ft/min for one installed Quick Select module and ft

/min

for the second installed module.

This ability eliminates the need for “on-the- y” change

between  ow volume and  ow velocity measurement

functions when doing air ow testing.

To set the MDI system up to present simultaneous dis-

play of  ow velocity and  ow volume follow the steps

below.

Step 1

Set the MDI system up to display  ow ve loc i ty

or volume (refer to Sections 14.2 and 14.4 for in for -

ma tion on setting up the MDI system to perform  ow

velocity or  ow volume testing). In this ex am ple, we

will assume the MDI system is starting from the si mul ta -

neous display of two  ow velocity mea sure ments. In this

mode the MDI system display will look as follows:

Step 2

Using the port select key, deactivate the side

of the display that you wish to maintain in the  ow

mea sure ment mode. In this case we will display  ow in

terms of ft/min on the left side and ft3/min on the right

Pressing port select once will deactivate the right side

of the display from  ow or pressure mea sure ment and

convert it to an mA measurement function.

Measurement Data for Flow (Volume or Velocity) and Tem per a ture

Section 14.9 Simultaneous Display of Flow Volume and Flow Ve loc i ty

Page 30

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Pressing port select a second time will deactivate the left

converting it to a mA measurement. The right side of the

display will resume  ow/pressure measurement ac tiv i-

ties. The second press of the port select key will result in

the following data display.

In this example, since we will be leaving the left side of

the display in terms of ft/min the port select key should

be pressed two times to produce the display:

Step 3

With the desired side of the display de ac ti vat ed

press the  ow key on the keypad of the MDI system .

The MDI system will respond by displaying:

Step 4

Using the left/right arrow keys select the

desired measurement function. In this case we have

decided that the left side of the display will remain in the

velocity mode and the right side will be changed to mea-

be selected for this example.

Step 5

With the word volume  ashing press the

enter key.

The MDI system will respond by displaying:

alternate unit of expressing  ow volume is desired.

Step 6

Press the port select key to reactivate the left

The left side of the display will have remained in terms of

ft/min. When reactivated the display will look as follows:

The MDI system is now set up for simultaneous display

of  ow volume and  ow velocity.

Measurement Press the Clear Entry Key (CE)

Section 14.10 Simultaneous Display of Flow

As outlined pre vi ous ly, the MDI system can present

pressure mea sure ment data from one or two Quick

Select pressure modules simultaneously. This ability

also extends to the MDI system ’s ability to display

 ow measurement data. In addition, the MDI system

can simultaneously display a  ow measurement on one

on the other side of the display. This capability can be

useful in calibrating transducers and transmitters that are

calibrated in terms of  ow, such as 0-200 ft/minute.

To take a  ow measurement and monitor the elec tri cal

output from the device under test follow the procedures

below:

Step 1

Set the MDI system up to function in the

desired  ow measurement (velocity or volume) mode

of op er a tion. Refer to Section 14.2 for in for ma tion on

or Section 14.4 for information on setting up the MDI

Step 2

Select the desired engineering units as outlined

in Sections 14.3 for  ow velocity and 14.5 for  ow vol-

ume.

Step 3

Press the port select key.

The MDI system will respond by changing the right

the display of an mA measurement. The display will

continue to display the output from the left Quick Select

module in terms of  ow.

To read the output of the right Quick Select module in

terms of  ow and the electrical measurement output

from the device under test press the Port Select key a

Step 4

With the  ow and electrical measurements

appearing in the desired locations on the display the

current measurement can be changed to a voltage mea-

sure ment by pressing the mA/V key.

Pressing the mA/V key once will change the display

to “------”.

Pressing the mA/V key a second time will

change the display to “volts”.

(Volume or Velocity) and an

Electrical Output Measurement

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Step 5

Connect the Quick Select Sensor module to be

used to the pressure source to be measured.

Step 6

Connect the output of the device to the standard

banana jacks on the keypad of the MDI system as follows:

For current output devices: use mA and

COM

jacks.

For voltage output devices: use Vdc and

COM

jacks.

Percent mode operation is also available for  ow test

and calibration measurement instruments. Refer to Sec-

tion 13.0 for information on percent function use.

Section 15.0 Leak Detection Function

The MDI system provides the ability to detect and

quantify leaks in terms of pressure decay over time (psi

change per unit of time) or in terms of leak rate (cc/sec).

In the pressure decay mode the MDI system will moni-

tor the desired pressure vessel for the pro grammed time

interval and, at the end of the mon i tor ing time period,

display the measured pressure change. In the leak rate

mode the MDI system will monitor the pressure vessel

over the pro grammed interval and display the leak rate

in terms of cc/sec.

Use of the leak detection function requires the setup

of the leak test parameters. The following pro ce dures

ing the MDI system .

Step 1

With the MDI system on and displaying pres sure

press the set up key.

Step 2

Using the arrow keys, locate and select the

words “LeakRate” in the set up menu. When selected the

words “LeakRate” will  ash.

Step 3

With the words LeakRate  ashing press the

enter key.

The MDI system will respond by displaying:

Step 4

Using the left/right arrow select the word Rate.

Step 5

With the word Rate  ashing press the enter key.

The MDI system will respond by displaying:

Step 6

Using the number keys enter the volume of the

vessel to be tested in cubic inches.

Step 7

With the MDI system displaying the re quired

vessel volume press the enter key.

Step 8

The MDI system will respond by displaying:

Step 9

Using the number keys enter the time in ter val,

in seconds, over which the leak rate test is to be per-

formed. The time interval may be from 0.1 to 65,000

Step 10

With the desired test interval displayed press

the enter key.

At this point the MDI system will return to basic pres-

sure measurement. See Sections 15.3 and 15.4 for infor-

mation on per form ing leak rate testing.

Step 1

With the MDI system on and displaying pres-

Step 2

Using the arrow keys, locate and select the

words “LeakRate” in the set up menu. When selected the

words “LeakRate” will  ash.

Step 3

With the words LeakRate  ashing press the

enter key.

Section 15.1 Leak Rate Function Setup

Section 15.2 Pressure Decay Test Set up

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The MDI system will respond by displaying:

Step 4

Using the left/right arrow select the word Decay.

Step 5

With the word Decay  ashing press the enter key.

Step 6

The MDI system will respond by displaying:

Step 7

Using the number keys enter the time in ter val,

in seconds, over which the pressure decay test is to be

performed. The time interval may be from 0.1 to 65,000

Step 8

With the desired test interval displayed press

the enter key.

At this point the MDI system will return to basic pres-

sure measurement. See Sections 15.3 and 15.4 for infor-

mation on per form ing leak rate testing.

To perform leak testing the desired Quick Select pres-

following provides information on activating the desired

pressure module for leak test applications:

With Two Quick Select Pressure Modules In stalled

If two pressure modules are installed and the output of

both are displayed, the MDI will default to per form ing

the leak test using the left pressure module.

If two Quick Select pressure modules are installed and

one of the two modules is deselected, meaning the

mea sure ment values of that module are not shown on

the display, the MDI will automatically select the active

pressure module to per form the leak test mea sure ments.

The port select key (PORT SEL) is used to select or

deselect a module. When a module is de se lect ed the

corresponding side of the display will indicate mA, Volts

or “------”. If only one Quick Select pressure module

is installed the MDI system will default to the installed

module for leak test measurements.

Section 15.4 Performing Leak Rate or Pressure

Leak rate and pressure decay tests are performed as follows:

Step 1

With the MDI on and reading pressure con nect

the pressure port of the selected pressure module to the

vessel to be monitored. If the pressure module in cor po -

rates a differential pressure module use the high pressure

port for the test procedure.

Step 2

For Pressure Decay

– Select the desired engineering

unit to be used as described in Section 8.

For Leak Rate

– Leak rate measurements are made in

cc/seconds and require no selection at this point.

Step 3

Pressurize the vessel to the required level for

the test and allow vessel pressure to stabilize from the

effects of sudden pressure increase or decrease.

Step 4

Press the key designated LEAK on the keypad

of the MDI base unit.

The MDI will display:

where:

Timing indicates that the MDI is timing the desired

monitoring interval.

the re main ing time left to be mon i tored.

eng unit =

the en gi neer ing unit in use for the se lect ed

module.

the current pressure mea sured by the selected

pressure module.

For Pressure Decay Testing

at the end of the test the

MDI system will display the following:

where:

Eng Unit =

the engineering unit of the measured val ue.

cccc =

current pressure mea sure ment for the

xxxx =

the mea sured pres sure change during

pressure decay test.

For Leak Rate Testing

at the end of the test the MDI

Decay Tests

Section 15.3 Module Selection; Leak Rate or Pressure Decay Tests

Page 33

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where:

Eng Unit =

the engineering unit of the current pres sure

measurement value.

cccc =

current pressure mea sure ment for the

xxxx =

the measured leak rate over the test in ter val.

entry (CE), enter (E) key or any of the four arrow keys.

Pressing any function key will activate that selection.

For example, pressing the en gi neer ing unit select key

(ENG UNIT) will activate the en gi neer ing unit selection

program.

Important Note

module that was used in the testing process and will dis-

play “------” on the other side of the display. If a second

module is installed in the other module bay it can be

re-selected using the port select func tion (PORT SEL) as

detailed in Section 5.0.

Section 16.0 Temperature Measurement Using

The MDI system can be used with most standard RTDs

temperature measurements. An GQS-RT type Quick

Select module is needed in order for the MDI system to

perform temperature measurement with an RTD. The

GQS-RT provides the interface be tween the MDI system

base unit and the RTD probe. There are two GQS-RT

Quick Select modules available in order to provide sup-

port for the most common RTD resistance levels.

The capabilities of the modules are summarized below:

GQS-RT1 Quick Select Module

Pt 100 (385&392)

–200 to 550°C:

0.15°C

550 to 850°C:

0.2°C

Ni 120

0.1°C

70 to 150°C:

0.6°C

Ohms

+0.01% reading +0.02 ohms

GQS-RT2 Quick Select Module

Pt 1000

0.15°C

Ohms

+0.01% reading +0.2 ohms

Engineering Units:

Fahrenheit, Celsius, Kelvin, Rankine or ohms

Ohms Measurement Range:

GQS-RT1 module:

0/400 ohms

GQS-RT2 module:

0/4000 ohms

The interface module incorporates a Switchcraft TA4M

type connector and requires an RTD with the ap pro pri ate

Switchcraft TA4F mating connector. The connector is

available through your instrument supplier.

To use the GQS-RT module with RTD probes already in

your possession simply connect your RTD to the mating

connector.

Your instrument supplier also provides Pt100 RTD

probes in a number of con  g u ra tions with the Switch-

craft TA4F already installed. Contact your instrument

 gurations.

Step 1

With the instrument off install the ap pro pri ate

GQS-RT Quick Select RTD interface module. In struc -

tions for in stal la tion of a Quick Select module can be

found in Section 3.2 of this manual.

Step 2

Connect the desired RTD probe to the Switch-

craft connector on the module

Step 3

Turn the MDI system on by pressing the On/

Off key.

Step 4

To access the temperature setup menu press the

Step 5

Use the downward pointing arrow to access the

following selection screen

RTmodule

optional

feature. This text will not ap-

pear if the MDI unit was purchased without this option.

Step 6

As required, using the left/right and up/down

arrows select the text “RTmodule”. The text RTmodule

will  ash when selected.

Step 7

With the text “RTmodule”  ashing press the

enter key.

RTD probes

Section 16.1 Setting Up the MDI System for Temperature Measurement

Page 34

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The MDI system will respond by displaying:

This represents the con guration of the RTD to be used,

where the number equals the number of wires the RTD

uses. Note: The use of a 4 wire RTD is recommended for

optimum accuracy.

Step 8

Using the left/right arrow keys select the ap pro -

pri ate con guration for the RTD probe to be used. In the

example below the 4 wire con guration was selected.

Step 9

With the desired wiring con guration selected

press the enter key.

The MDI system will respond by displaying the avail-

able units of measure as follows:

Step 10

Using the left/right arrow keys select the

desired engineering unit for the measurements to be

made. In the ex am ple here the measurements will be

made in degrees Celsius.

Step 11

With the desired engineering unit selected and

 ashing press the enter key.

The MDI system will respond by displaying the fol-

low ing:

On initial use the  rst selection and the cor re spond ing

probe will appear selected. Use the arrow keys to select

the desired coef cients from the available factory pro-

grammed curves. The GQS-RT1 is pre-preprogrammed

for the following RTDs.

Position

Probe

α38

–200/850

α392

–200/850

Ni Minco (Ni 120

)

Cu 10 ohm

5-8

available for pro gram ming using the optional

calibration and pro gram ming software for the

GQS-RT1 module, part number 838X014-01 for

/2 inch disk or 838X014-02 for 5

inch disks.

Important Note

RTD probes with output resistance values of be tween 0

and 400 ohms. Use of the module with higher resistance

RTD probes will result in di min ished accuracy and pos-

The GQS-RT2 is pre-preprogrammed for the fol low ing

RTDs

Position

Probe

PT 1000

2-8

available for programming using the

optional calibration and programming soft-

ware for

the GQS-RT2 module.

Important Note

RTD probes with output re sis tance values of 1000 to

4000 ohms. It will function with lower resistance RTDs

but will provide diminished ac cu ra cy. In addition, use of

the module with higher resistance probes will result in

di min ished ac cu ra cy and possible damage to the module

elec tron ics.

Step 12

Using the left/right arrow keys select the RTD

probe type for the measurements to be made. In the

example here the mea sure ments will be made in using

the PT 100 type 385.

a385

–200/850

Pta385

R0=100

Step 13

With the desired probe type selected and  ash-

ing press the enter key.

The MDI system will respond by displaying:

The maximum resolution that the combination of the

MDI system base unit, RTD interface module and probe

can support can be determined as follows:

The res o -

lu tion of the RTD module is 0.001% of the full scale

resistance of the reference resistor used in the module.

The GQS-RT1 in cor po rates a 400 ohm reference resistor

and the GQS-RT2 incorporates a 4000 ohm reference

resistor.

Using the GQS-RT1 as the example the max i mum reso-

lution is:

Page 35

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0.001% of 400 ohms

= 0.00001 x 400 = 0.004 ohms

For a Pt100 the temperature resolution can be de ter -

mined as follows:

0.004 ohms/(100 ohms x 0.00385 ohms/degree C) =

0.008 degrees C (approx 0.005 degrees F)

Therefore, rounding to the next highest digit results in a

resolution of 0.01 degrees C.

The resolution supported for the factory pro grammed

RTDs can be found below:

Using the RT-1

Probe Type

Resolution

Pt 100 (385 & 392)

0.01 degrees C or F

Ni 120

0.1 degrees C or F

Cu 10

0.1 degrees C or F

Using the RT-2

Probe Type

Resolution

Pt 1000

Resolution must be selected in conjunction with the full

Step 14

Select the desired resolution using the left/right

arrow keys. In this case, since we are using the Pt100

RTD with a maximum resolution of 0.01 degrees C the

0.01 option has been selected

Resolution:

Step 15

With the desired resolution selected and  ash-

ing press the enter key.

The MDI system will brie y show internal limit settings

and will then commence temperature mea sure ment.

The measurement parameters can be changed at any time

through the activation of the RTmodule set up menu.

The GQS-RT can be programmed in the  eld. Pro gram -

ming, calibration adjustment or re cer ti  ca tion can be

accomplished with the Calibration Pro gram ming Utility

disk. Please note, in order to improve the accuracy of

the mea sure ment system it will be necessary to gener-

ate a signi cant number of very accurate tem per a ture

calibration points using pre ci sion tem per a ture baths. In

general, the simplest way to en-hance the accuracy of

the temperature mea sure ment is to simply re-zero the

probe while immersed in an ice bath.

Section 17.0 Thermocouple Interface Mod ule

The Thermocouple Interface Module allows the MDI

base unit (equipped with  rm ware version 2.01 or later)

to read the input from a ther mo cou ple tem per a ture

mea sur ing device. The calibrator offers the following

features for ther mo cou ple mea sure ment:

• selectable units of measure

• direct millivolt readout for any type of ther mo cou ple

• choice of internal or external refernce junction

• Selectable resolution, or “auto” mode

• Programming to allow readout in temperature units for

the following 8 thermocouple types:

Type

Materials

Iron & Copper-Nickel (Constantan)

Nickel-Chromium & Nickel-Alu mi num

Copper & Copper-Nickel (Constantan)

Nickel-Chromium & Copper-Nickel

Platinum-13% Rhodium & Platinum

Platinum-10% Rhodium & Platinum

Platinum-30% Rhodium & Platinum – 6%

Rhodium

Nickel-Chromium-Silicon & Nickel-Silicon

Magnesium

For the TC1 certi cation procedure, see Appendix F.

Step 1

To begin measurement with a thermocouple,  rst

attatch the thermocouple to a male “miniature ther mo -

cou ple connector”. Please note that con nec tors are spe-

ci cally manufactured for each ther mo cou ple type and

will be marked accordingly.

Failure to use the properly

mated connector will result in additional inaccuarcy.

Step 2

Turn the calibrator off. Install the ther mo cou ple

interface module into either of the modules bays in the

top of the calibrator. Now install the thermocouple into

the interface by inserting the male blades of the min-

ia ture connector into the slots in the receptacle located

on the top of the thermocouple interface module.

Step 3

Turn the base unit on.

When the display has completed the “power up” cycle,

press the “set up” key.

SET

Using the arrow keys, select the words “TC Module.”

Press the “enter” key.

Section 16.2 Calibrating/Programming the RT

GQS-RTD Interface Mod ule

Section 17.1 Thermocouple Measurement Set Up

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If two thermocouple interface modules have been in-

stalled

be applied. The display will read:

Using the left or right arrow keys, select the module to

be programmed and press the “enter” key.

installed, the left/right selection identi ed in the previ-

ous step will not appear. The process will begin with the

The calibrator will display:

Using the left or right arrow keys, select the desired unit

of measure, and press enter. (Selection of the millivolt

readout will instruct the calibrator to display the voltage

within the thermocouple circuit. The internal reference

junction cannot be applied in this mode).

No further base unit programming will be required. If

the millivolt mode has been selected, the pro gram ming

cycle will end when the “enter” key is pressed, and the

cal i bra tor will begin to display the real-time millivolt

mea sure ment from the thermocouple circuit.

The top display will now indicate the choices for the

thermocouple types. In addition, the lower line of the

display will indicate the 2 types of metal which com-

prise the thermocouple type which is currently  ashing.

access the factory programmed coef cients which will

allow

the calibrator to display in a unit of

temperature

measurement).

Using the left or right arrow keys, select the type of

thermocouple that has been installed, and press the

“enter” key.

The display will now indicate the resolution choices.

Using the left or right arrow keys, select the degree of

resolution closest to the working tolerance for the type

of thermocouple that has been installed or select the

“auto” mode (which will allow the calibrator to au to -

mat i cal ly adjust the display to the greatest

signi cant

resolution), and press the “enter” key.

The calibrator will now display the choices for the ref-

er ence junction.

By selecting the “auto” mode, the calibrator will utilize

the internal thermistor/resistor based on the reference

junction that is resident inside the interface module.

The “manual” mode allows for the use of an external

reference junction. A stable temperature reference, usu-

ally in the form of an ice bath, is required.

Using the left or right arrow keys, select the desired

reference junction and press the “enter” key.

If the “auto” mode was selected, the calibrator will now

return to real-time measurement mode, dis play ing the

temperature measurement from the ther mo cou ple and

the reading from the other module bay, if a module or an

interface module has been installed.

If the “manual” mode was selected, the calibrator must

be programmed with the reference temperature of the

external reference junction. the display will read”

may display “.0000”. Entering a new value will over

write these existing numbers).

Program in the new temperature value of the exter-

nal reference junction, using the number keys on the

keypad. (The value that is being programmed should be

ref er enced to the same unit of measure that was selected

for the readout).

Press the “enter” key.

The calibrator will now return to the real-time mea-

sure ment.

When the base unit is turned off and turned on again, it

will have “remembered” the selections that were made

during the previous entry process, and default to those

parameters (refer to appendix C for spec i  ca tions).

Page 37

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Section 18.0 Pressure and Temperature Switch

The MDI system can be used to test pressure and tem-

per a ture switches. On board  rmware provides the abil-

ity to verify switch trip points, reset point and to test the

deadband of a pressure switch. To perform these type of

tests follow the procedures as outlined in the sub sec tions

of Section 18.

The switch testing process incorporated in the MDI sys-

tem  rmware looks for a change of state that pro duc es

a change of greater than either 2 volts or a 2 mA across

the corresponding banana jacks. The banana jacks are

located on the bottom of the keypad on the MDI system.

Prior to initiating these test procedures the required elec-

trical set up should be con gured to provide the neces-

The following procedure outlines the set up required for

the test of pressure and tem per a ture switch es.

Step 1

With the MDI system on and reading pres sure

or temperature, in accordance with the type of switch

to be tested, press the Port Select key, des ig nat ed PORT

SEL, the required number of times to leave activated the

Quick Select module being used for the test function and

de ac ti vate (convert the display to mA, “------” or Volts)

the other side of the display.

Step 2

Press the mA/V key as required to change the

electrical measurement parameter to that to be used for

the switch test. Switch to Volts if the change of state will

be greater than 2 Volts; switch to mA if the change of

Step 3

Connect the switch electronics with a current

or voltage source, as required, to provide the re quired

greater than 2 Vdc or greater than 2 mA change in state.

Be certain that the change in state to be gen er at ed cor-

responds to the electrical mea sure ment (mA or V) set up

on the display of the MDI system.

Notes:

The MDI is available with several ac ces so ries/

options to sim pli fy the testing of switch es. These are:

– The MDI system is available with an optional 24

Vdc built-in loop power supply. This supply can be used

to power transducers, transmitters and switches during

calibration and test operations. If the MDI indicator is

to be powered by the battery option, Section 3.2 of this

manual should be consulted for the effects of the loop

power supply on battery life.

– Loop Power Supply, Model LPS-IIa- A portable

9 Vdc powered power supply that provides a 24 Vdc

output. This device can be used to provide the necessary

electrical supply for the testing of switches that are not

active or connected to a line supply. For information

contact your instrument supplier and request bulletin

HACC-PS.

– Voltage Converter, Model SM-1- A modular voltage

adapter device that connects to the voltage and common

banana jacks on the MDI system. The MDI system volt-

age measurement ca pa bil i ty is limited to 30 Vdc. Testing

of switches used in con trol ling higher level electrical

able level, could seriously damage the MDI system

elec tron ics. The SM-1 will reduce electrical inputs in

the range of 10/250 Vac and 10/400 Vdc to 3 Vdc. The 3

Vdc output from the SM-1 will provide suf cient output

protecting the MDI system elec tron ics from damage.

Step 4

Connect the output signal of the switch to the

banana jacks on the front of the MDI system as out lined

below.

For voltage:

volts (V) jack and common (COM).

For current:

milliamps (mA) jack and common.

Step 5

Connect the switch to a controlled pressure/

vacuum source to generate the required level of pressure

or vacuum to trip the switch.

Step 6

Proceed to Section 17.2 for trip detect testing or

to Section 18.3 for deadband testing.

Step 1

With the MDI system on and reading pres sure

or temperature press the trip detect key.

TRIP

The MDI system will respond by displaying:

Step 2

Using the left/right and up/down arrow keys

Testing

Section 18.1 Setting Up the MDI System for Testing of Pressure and Temperature Switches

Section 18.2 Test of Switch Trip Point

Page 38

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Step 3

With the word “manual”  ashing press the

enter key.

Step 4

Gradually increase the pressure, vacuum or

temperature until the display of the MDI system in di -

cates that a change of state has been detected. When the

where:

• Eng Unit is the pressure or temperature engi-

neering unit in use

• Tripped indicates the pres sure or temperature

• +12345 represents the pressure or temperature

at which the switch tripped

• +vvvvv voltage value

Step 5

To perform additional trip tests press any key

and the trip detect system will be rearmed.

Step 6

To discontinue the switch testing process press

the trip detect key.

TRIP

The MDI system will respond by displaying:

Step 7

Using the left/right and up/down arrow keys

Step 8

With the word “disable”  ashing press the

enter key.

The switch test operation has now been terminated.

Section 18.3 Switch Deadband Test Pro ce dure

Step 1

With the MDI system on and reading pres sure

or temperature press the trip detect key.

TRIP

The MDI system will respond by displaying:

Step 2

Using the left/right and up/down arrow keys

Step 3

With the word “Deadband”  ashing press the

enter key.

Step 4

Gradually increase or decrease, as required,

pressure, vacuum or temperature until the display of the

MDI system indicates that a change of state has been

detected. When the switch has tripped the MDI system

will display:

where:

• Eng Unit is the pressure or tem per a ture en gi -

neer ing unit in use

• Tripped indicates the pressure or tem per a ture

• +12345 pressure at which the switch tripped

• +vvvvvvoltage value

Step 5

To perform a deadband test, maintain the

pres sure/vacuum or temperature and power applied to

the switch and press any key to re-arm the trip de tec tion

Step 6

Gradually allow the pressure/vacuum or

tem per a ture level applied to the switch to return to the

Step 7

When the MDI system detects a reset on the

where:

xxxxxx

is the measured trip point

zzzzzz

is the measured reset point

yyyyyy

is the measured deadband value

Step 8

To perform additional deadband tests press any

key and the trip detect system will be rearmed.

Step 9

To discontinue switch testing press the trip

detect key.

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The MDI system will respond by displaying:

Step 10

Using the left/right and up/down arrow keys

Step 11

With the word “Disable”  ashing press the enter

key.

The switch deadband test operation has now been ter mi -

nat ed.

Section 19.0 RS232 Interface General

To simplify the interface of the MDI system with your

computer, recorder, data acquisition hardware or dumb

terminal three standard operating modes for the RS232

interface are avail able. A fourth RS232 op er at ing mode,

ISO1745, is included on the menu options. This mode

is only used in uploading data from the optional data

logging memory and in factory cal i bra tion, set up and

repair activities.

Function

Relay 1 common (for alarm option)

Transmit data

Read data

Data set ready

Ground

Data transfer ready

Relay 1 normally open (for alarm option)

Re lay 2 common (for alarm option)

Relay 2 normally open (for alarm option)

To con gure the RS232 interface on the MDI system

for the communication with your input device,  rst

de ter mine the interface requirements of the device to be

used with the MDI. Then using the RS232 setup feature

con  g ure the RS232 in ter face on the MDI system, fol-

lowing these steps:

Use a standard RS232 cable, to connect the MDI system

to a 9 pin serial port on a computer, available from your

instrument supplier. An adaptor to connect the MDI sys-

tem to a 25 pin serial con nec tion on a computer is also

available. The RS232 con nec tor is located above the AC

adapter input on the right side of the MDI system when

looking down at the MDI system with the keypad up in

the normal operating orientation. Pin out in for ma tion

is pro vid ed in the event that you wish to use your own

RS232 cable.

To communicate with the MDI system through the use

of a dumb terminal set the terminal up as fol lows:

Select baud rate to be used: 300, 1200, 2400 or 9600

Select communications (com) port: 1 or 2

Set data bits to:

Set stop bits to:

Set parity to:

None

Flow control:

None

The MDI system supports three methods of com mu ni c-

a tion. These com mu ni ca tion formats will appear as se-

lection options during the set up of the RS232 interface.

A fourth mode of RS232 com mu ni ca tion, ISO1745, is

listed in the menu selections. This RS232 mode is only

used for uploading, to a com put er or acquisition system,

measurement data stored in the op tion al data logging

memory and for factory cal i bra tion, setup and repair

activities. An overview of the features of these formats

follows.

The ISO1745 mode of operation is used to interface the

MDI system with the upload program provided to export

data logged values into a P.C. compatible computer. If

your MDI system is equipped with the

optional

data log-

ging capability, consult Section 24 of this manual for set

up of the RS232 interface with uploading of stored data.

A separate manual is pro vid ed to support the use of the

upload soft ware provided with your MDI system. Units

not equipped with the data logging option are not sup-

plied with the upload program disks or manual.

In for ma tion

Section 19.1 Con guring RS232 Interface for Use with a Dumb Terminal

Section 19.2 RS232 Con guration Options

Section 19.2.1 RS232 Interface ISO1745 Operating Mode Over view

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Section 19.2.2 RS232 Interface – Journal Mode

This mode allows the MDI system to be interfaced to

an RS232 compatible printer or other device where a

mode is selected the MDI system will trans mit the cur-

rent pressure measurement(s) as shown below:

+0.005 inH2O+0.0000 psi

Left Min: +0.0045 Max: +0.0053

Right Min: +0.0000 Max: +0.0000

+0.003 inH2O+0.0000 psi

Left Min: +0.0032 Max: +0.0049

Right Min: +0.0000 Max: +0.0000

+0.003 inH2O+0.0000 psi

Left Min: +0.0033 Max: +0.0035

Right Min: +0.0000 Max: +0.0000

Each data set consists of three (3) lines. The  rst line

displays the current measurement data as seen on the

instrument display. This line will display the pres sure,

 ow, temperature or electrical measurement in the

changed from the keypad as outlined in the en gi neer ing

unit section of this manual, Section 8.0, while the RS232

interface is in use. In addition, the MDI system can be

changed from pressure to  ow measurement while the

RS232 interface is in use.

The second line displays the minimum and max i mum

values stored in memory for the left module module

The third line displays the minimum and maximum val-

ues measured by the right module since the last time the

minimum and maximum pressure values were cleared

from memory.

In the journal mode the RS232 interface will output the

data as outlined above at a regular interval. The interval

is selected in the RS232 setup procedure and may be

from 1 second to 65,000 seconds.

When the RS232 interface of the MDI system is set up

in the inquiry mode the MDI system transmits the data

inquiry character.

+0.003 Eng Unit +0.0000 Eng Unit

The  rst value represents the measurement value dis-

played on the left side of the display and includes the

the measurement value displayed on the right side of the

display, including the selected unit of measure.

The remote modes supports communication and control

of the MDI via a PC or ter mi nal. See Ap pen dix A for

com plete details on remote com mu ni ca tions.

To use the RS232 interface in the Journal Mode follow

the steps below.

Step 1

With the MDI system on and reading pres sure

press the set up key.

Step 2

Using the arrow keys move through the menu

Step 3

With the text RS232  ashing press the enter key.

This will activate the RS232 setup options sub menu.

The  rst screen that appears after selection of RS232

from the main setup menu is:

The RS232 interface must be enabled (activated) for the

MDI system to communicate with any RS232 device.

When the RS232 is not in use it is recommended that the

RS232 interface be disabled to conserve on power use

and maximize battery life.

Step 4

Use the arrow keys to select Enable (activate)

and press the enter key.

Step 5

With the word Enable  ashing press the

enter key.

Step 6

After selecting “Enable” the MDI system will

respond with the following display.

Overview

Section 19.2.4 RS232 Interface – Re mote Mode Overview

Section 19.3 Setup of the RS232 Interface in the

Journal Mode

Section 19.2.3 RS232 Interface – Inquiry Mode Overview

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Step 13

Select the desired end of message character.

the CrLf (carriage return/line feed) is the most common

option. If the data output is to be trans mit ted into a data-

base or spreadsheet program the end of message charac-

ter must be selected in accordance with the re quire ments

of the application software. Proceed to Step 16 to input a

custom end of message character.

Step 14

To use CrLf as the end of message character use

the arrow keys to select the text “CrLf”. When selected

the text “CrLf” will  ash.

Step 15

With the text CrLf  ashing press the enter key.

The MDI system will return to pressure/temperature

mea sure ment and will transmit data to the terminal, ac-

qui si tion device, computer or recorder as pro grammed.

While communicating, engineering units may be

changed or the MDI system may be changed be tween

basic pressure measurement and  ow mea sure ment.

Important Note:

Invoking set up functions or ded i -

cat ed keypad functions will temporarily suspend the

trans mis sion of data during the setup process. For most

functions data transmission will resume when the set up

is com plete. However, the RS232 interface must be re-

enabled via the RS232 set up process to re-initiate data

trans mis sion after either automatic data logging or leak

detection functions are activated.

Step 16

To select a programmable end of message char-

acter use the arrow keys to select the text “Prog”.

Step 17

With the text Prog  ashing press the enter key

The MDI system will respond by displaying:

Step 18

Using the number keys enter the decimal code

for the desired end of message character. A list of the

decimal codes for the available ASCII char ac ters can be

found in Appendix B.

Step 19

With the decimal representation of the desired

ASCII character displayed press the enter key.

The MDI system will return to the operation of pres-

sure measurement and will transmit data to the termi-

nal, acquisition device, computer or recorder as pro-

grammed. While communicating, engineering units may

The current baud rate selection will  ash on the display.

Step 7

Using the left/right arrow keys select the de-

display.

In the above example the baud rate 9600 has been

Step 8

With the desired baud rate  ashing press the

enter key.

After the desired baud rate has been entered the

MDI system will display:

Step 9

Using the arrow keys select the word Jour nal.

When selected the word Journal will  ash.

Step 10

With the word Journal  ashing press the

enter key.

The MDI system will respond by displaying the fol low ing:

Step 11

Using the number keys enter the desired inter-

val, in seconds, between data transmissions. The interval

may be any value from 1 second to 65,000 seconds. In

the example below the MDI system is being instructed

to transmit a set of readings every 600 seconds (10 min-

utes).

Step 12

With the desired time interval displayed press

the enter key.

The MDI system will respond by displaying:

Page 42

Revision 4.3 3/2004

be changed or the MDI system may be changed between

basic pressure measurement and  ow measurement.

Important Note:

Invoking set up functions or ded i -

cat ed keypad functions will temporarily suspend the

trans mis sion of data during the setup process. For most

functions data transmission will resume when the set up

is com plete. However, the RS232 interface must be re-

enabled via the RS232 set up process to re-initiate data

trans mis sion after either automatic data logging or leak

detection functions are ac ti vat ed.

Section 19.4 Setup of the RS232 Interface in the

To use the RS232 interface in the Inquiry Mode follow

the steps below.

Step 1

With the MDI system on and reading pres sure

press the set up key.

Step 2

Using the up/down and left/right arrow keys

move through the menu selection and highlight the text

“RS232” so that is  ashes on the display.

Step 3

With the text “RS232”  ashing press the

enter key.

This will activate the RS232 setup options sub menu.

The  rst screen that appears after the selection of RS232

from the main setup menu is:

The RS232 interface must be enabled (activated) for the

MDI system to communicate with any RS232 device.

When the RS232 is not in use it is recommended that the

RS232 interface be disabled to conserve on power use

and maximize battery life.

Step 4

Use the arrow keys to select the word Enable.

When selected the word Enable will  ash.

Step 5

With the word Enable  ashing press the enter key.

Step 6

After entering the Enable option the MDI sys-

tem will respond with the following display.

The current Baud rate selection will  ash on the display.

Step 7

Using the left/right arrow keys select the de-

display of the MDI system.

In the above example the baud rate 9600 has been

Step 8

With the desired baud rate selected and  ashing

press the enter key.

Step 9

After the desired baud rate has been entered the

MDI system will display:

Step 10

Using the arrow keys select the word “Inquiry”,

when selected the word will  ash.

Step 11

With the word Inquiry  ashing press the

enter key.

The MDI system will respond by displaying the fol low ing:

Step 12

Using the number keys enter the desired end of

message character in decimal code. A list of the avail-

able ASCII characters and their corresponding decimal

codes is provided in Appendix B. The inquiry character

acts as a signal to the MDI system to transmit a data set.

The inquiry character is trans mit ted to the MDI system

from the computer or other device con trol ling the data

trans mis sion activities. Select an inquiry character to be

used in pro gram ming as the trans mis sion prompt.

Step 13

With the decimal representation for the desired

inquiry character displayed press the enter key.

The MDI system will respond by displaying:

Inquiry Mode

Page 43

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Step 14

Select the desired end of message char ac ter.

For data transmission to a screen on a dumb terminal

the CrLf (carriage return/line feed) is the most com-

mon option. If the data output is to be trans mit ted into

a database or spreadsheet program the end of message

char ac ter must be selected in accordance with the re-

quirements of the application software.

Using the number keys enter the decimal code for the

codes for the available ASCII characters can be found in

Appendix B.

Step 15

With the desired decimal representation for

the ASCII character entered and displayed press the

enter key.

The MDI system will return to pressure mea sure ment

and will transmit data to the terminal, ac qui si tion device,

computer or recorder as programmed.

While communicating, engineering units may be

changed or the MDI system may be changed be tween

basic pressure measurement and  ow mea sure ment.

Important Note:

Invoking set up functions or ded i -

cat ed keypad functions will temporarily suspend the

trans mis sion of data during the setup process. For most

functions data transmission will resume when the set

up is com plete. However, the RS232 interface must be

re-enabled in the RS232 set up process to re-initiate data

trans mis sion after either automatic data logging or leak

detection functions are activated.

Section 20.0 Status

The status prompt provides a means to query the MDI

the last calibration date of the module(s) in stalled. The

hardware and  rmware revision num bers are for factory

use in determining the level of  rm ware and hardware

in the MDI system. In ad di tion, the ability to check cal i -

bra tion dates for in stalled Quick Select pressure modules

pressure modules.

To invoke the status selection follow the steps below.

Step 1

With the MDI system on and reading pres sure

press the set up key.

Step 2

Using the left/right and up/down arrow keys

Step 3

With the word Status  ashing press the enter key.

Step 4

After pressing ENT the display will read:

where:

dd/dd/dd:

provides the date of calibration of the

base

unit.

fw :

revision level of the  rm ware

hw:

revision level of the hard ware

After reviewing and recording any desired in for ma tion

press the enter key to call up the second status screen.

Step 5

After pressing the enter key a second time, the

MDI system will respond by displaying:

where:

dd/dd/dd:

calibration date of the left module.

Type:

relates to pressure type of module.

Step 6

After reviewing this display and recording any

desired information press the enter key to call up the

third status screen. After pressing the enter key the MDI

where:

dd/dd/dd:

calibration date of the right module.

Type:

relates to pressure type of module.

Review and record any needed information.

Step 7

Press the enter key to return to the basic pres-

The battery check key, designated BAT CK, allows for

easy tracking of the power level remaining in the bat-

ter ies that power the MDI system. Two, mutually exclu-

Section 20.1 Reviewing Instrument Sta tus

Section 20.2 Battery Power Status Check

Page 44

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2 – Rechargeable NiCad battery pack

To check the battery power level press the BAT CK key.

The MDI system will respond by dis play ing:

where:

+x.xx V:

battery voltage level.

Battery Life*

Time in Hours

NiCad

Alkaline

Pack

Stan dard Operation

Total available time with:

Backlight on

4.5

3.25

Optional Loop supply (no load)

Optional Loop supply (12mA load)

4.5

Backlight & loop supply (no load)

2.5

Backlight & loop supply (12 mA load)

operation at a nominal temperature of 70 degrees Fahr-

en heit. Use of the MDI product at tem per a ture signi -

cantly less than 70 degrees Fahrenheit will adversely

effect battery life.

Important Note:

Due to the extreme variation in battery

life under different operating conditions (backlight on

or off or loop supply in use, it is rec om mend ed that

the battery voltage value be used to de ter mine when

re place ment of batteries is war rant ed.

Step 1

Install new batteries as outlined in the base unit

Step 2

Turn the MDI system on.

Step 3

With the MDI system operating and dis play ing

pressure press the battery check key, designated BAT CK:

The MDI system will respond by displaying:

Note:

Installation of new alkaline bat ter ies will produce

an initial voltage measurement of 6.8-7.5 Volts on the

MDI system. If the value mea sured is sig ni cant ly be-

low this level it is likely that the batteries have degraded

in storage and that they will provide less than the 48

hours of operation expected from a set of fresh, fully

charged batteries.

Important Note:

It is recommended that batteries be

replaced or, in the case of NiCad batery pack useage that

the batteries be recharged when the low voltage (approx.

5.6 Vdc) icon appears on the in stru ment display.

Typical

re main ing battery life when the low battery icon ap-

pears is ap prox i mate ly 1 hour with backlight off and

no loop power option installed.

Section 21.0 Dual Module Functions

The MDI system is equipped with  rmware that can au-

tomatically add the measured pres sure values from two

installed Quick Select pressure modules or to subtract

the value measured by the Quick Select module installed

in the right module bay from the measured value of the

Quick Select value in the left module bay. This optional

 rmware allows for the following:

– The ability to subtract the measured value from the

left module of the measured value derived from the

right module allows for sim pli  ed mea sure ment

of what are com mon ly referred to as “high-line”

or elevated static dif fer en tial pressures. A com plete

description of this capability is pro vid ed in Section

21.2.

– The ability to add the measured values of the two in-

addition of a measured baro met ric pressure from an

ab so lute pressure module to the measured pressure

from a gauge or differential pressure. This capabil-

ity can come in handy and save money by al low ing

the use of gauge mea sure ment Quick Select pressure

modules for absolute pressure mea sure ment activi-

ties.

The accuracy of measurements made using the dif fer -

ence or sum of 2 modules is a function of the full scale

range of the Quick Select pressure modules used and,

in the case of dif fer en tial pressure mea sure ments, the

mag ni tude of the dp range.

For dual module

summation

measurements:

The worst case inaccuracy would be the sum of the

inaccuracies of the two Quick Select modules used for

the measurement. For example, if the mea sure ment is

made with two

0.1% full scale modules the maximum

in ac cu ra cy would be

0.2%. In actual use, it is gen-

erally ac cept able to use the Root Sum of the Square

com po nent measurement system. Using the RSS method

the accuracy of the dual module sum ma tion is ap prox i-

mate ly

0.14% of span.

For dual module

differential

pressure mea sure ment:

The accuracy of the dual module differential pres sure

measurement is a function of the full scale range of the

Section 21.1 Accuracy of Dual Module

Measurements

Page 45

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Quick Select modules used in the mea sure ment process

and the magnitude of the dp range. In general, the ac-

cu ra cy for the dp mea sure ment for dp ranges less than

0.37% of dp range

than 10% of the range of the Quick Select pressure

module installed the accuracy of the dp measurement is

0.37 % of the dp range x 0.1(R1) where R1 equals the

ratio of the module full scale to the dp full scale (Sensor

full scale/dp full scale).

Section 21.2 Setting Up Dual Module Differential

Step 1

With the MDI system off, install the two Quick

Select pressure modules in the MDI base unit. Be certain

to install the module so that the modules are in the

desired module bays. The subtraction process is always

de ned as the subtraction of the measured value of the

right module from that of the measured value of the left

module (d/p= Left mea sure ment value - right mea sure -

ment value)

Step 2

With the modules installed, turn the MDI sys-

tem on by pressing the on/off key.

Step 3

With the MDI system on and displaying pres-

sure measurement data from the two installed Quick

Select modules press the Set Up key.

Step 4

Using the up/down and left/right arrow keys

locate the section of the set up menu that includes dp

measurement set up. This menu will appear on the MDI

Step 5

Use the arrow keys to highlight the text “dp

Meas”. When highlighted the text will  ash on the

display.

Step 6

With the text “dp Meas”  ashing press the enter

key.

The MDI system will respond with the following display.

Step 7

To perform dual module differential pressure

measurement select “L-R”; to exit this dp set up and

return to basic pressure measurement select “NONE”.

To proceed, use the arrow keys to select the text “L-R”

Step 8

With the text “L-R”  ashing press the enter key.

After pressing the enter key the MDI system will return

to basic pressure measurement.

Step 9

To activate the dual module dp mode of op-

er a tion press the port select key one time after the set up

has been complete. The MDI system will display the fol-

low ing text for a MDI system dis play ing mea sure ment

values in the psi engineering unit.

xxxx

When the dual module differential  rmware is active the

following measurement sequence will result from press-

ing the PORT SELECT (PORT SEL) key.

First press of the port select key:

xxxx

Second press of the port select key:

PSI

Third press of the port select key:

Fourth press of the port select key:

xxxx

Fifth press of the port select key:

PSI

the Sixth press of the port select key will return to the

 rst dp screen as shown below and allow repeat of the

choice of available port select con  g u ra tions

PSI

When static pressure is being applied to both mod ules at

Pressure Measurement

Page 46

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zero differential pres sure press the TARE Key to elim-

i nate any offset caused by the elevated static to op ti mize

mea sure ment accuracy.

Notes on interpreting the displayed measurement values:

– On a display set up with an L-R indication on one

nation on the otherside of the display the value under the

L-R des ig na tion is the resulting value from the subtrac-

tion of the right Quick Select mea sure ment from that

of the left Quick Select mea sure ment. The value on the

op po site side of the display, under the en gi neer ing unit

without the L-R pre x represents the pres sure measure-

ment from the Quick Select pressure module installed in

the cor re spond ing side of the MDI system. By using the

port select func tion it is possible to read the dif fer en tial

pressure measurement value as well as either of the

inputs in de pen dent ly.

– Due to the length of the engineering unit des ig na tion

when the d/p is expressed in a user engineering unit the

L-R indication will be not be present on the display.

The display is limited to 16 characters/line and cannot

display both the L-R and a U_XXXXXX en gi neer ing

unit label.

Section 21.3 Setting Up Dual Module Summation

Step 1

With the MDI system off, install the two Quick

Select pressure modules in the MDI system. As this is a

module bay.

Step 2

With the modules installed, turn the MDI sys-

tem on by pressing the on/off key.

Step 3

With the MDI system on and displaying pres-

sure measurement data from the two installed Quick

Select modules press the Set Up key.

Step 4

Using the up/down and left/right arrow keys

locate the section of the set up menu that includes dp

measurement set up. This menu will appear on the MDI

Step 5

Use the arrow keys to highlight the text “dp

Meas”. When highlighted the text will  ash on the dis-

play.

Step 6

With the text “dp Meas”  ashing press the

enter key.

The MDI system will respond with the following dis-

play.

Step 7

To perform pressure measurement using the

dual module summation mode select “L+R”; to exit

this dp set up and return to basic pressure mea sure ment

Step 8

With the text “L+R”  ashing press the enter key.

After pressing the enter key the MDI system will return

to basic pressure measurement.

Step 9

To activate the dual module dp mode of op-

er a tion press the port select key one time after the set

up has been complete. The MDI system will display the

following text

for a MDI system displaying measurement values in the

psi engineering unit.

When the dual module summation  rmware is active the

following measurement sequence will result from press-

ing the PORT SELECT key

First press of the port select key:

Second press of the port select key:

Third press of the port select key:

Fourth press of the port select key:

Pressure Measurement

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Fifth press of the port select key:

The Sixth press of the port select key will return to the

 rst dp screen as shown below and allow repeat of the

choice of available port select con  g u ra tions

Notes on interpreting the displayed measurement values:

– On a display set up with an L+R indication on one

na tion on the other side of the display the value under

the L+R designation is the resulting mea sure ment for the

to the mea sure ment value of the right Quick Select

module. The value on the op po site side of the display,

under the en gi neer ing unit without the L+R pre x, rep-

resents the pressure mea sure ment from the Quick Select

pressure module installed in the cor re spond ing side of

the MDI system. By using the port select func tion it is

pos si ble to read the sum ma tion pressure mea sure ment

value as well as either of the inputs in de pen dent ly.

– Due to the length of the en gi neer ing unit des ig na tion

when the d/p is expressed in a user en gi neer ing unit the

L+R indication will be not be present on the display.

The display is limited to 16 characters/line and cannot

display both the L+R and a U_XXXXXX en gi neer ing

unit label.

There are two basic ways to perform data logging with

the MDI system. These are

• sequentially ungrouped storage

• grouped for certi cation generation

of an instrument under test.

Sequential data logging is detailed in this section (Sec-

tion 22) of this manual.

Data logging with the enhanced certi cation gen er a tion

data logging is detailed in Section 23.

Note:

Base units equipped with optional data log ging

include a lithium battery to back up the Random Access

Memory (RAM) used to store data logged values. If the

battery voltage is low the following message will appear

on the DATA LOG key pressed.

When this message appears on the display the battery

24.2 for details on battery re place ment. Acceptable bat-

teries are listed in section 24.2.

Section 22.1 Sequential Data Logging Function

The sequential data logging function provides three means

of capturing and storing measurement data. These are:

• automatically at a de ned time interval

• automatically with delayed start

• manually at the push of the data store key

In the automatic data logging mode, data logging can

be pro grammed to occur at a time interval of from 0.1

to 65,000 seconds. The manual mode of data logging

allows storage of the displayed measurement data at the

push of a key.

In the sequential data logging mode the MDI has the

ca pac i ty to store a maximum of 714 data sets with the

time/date stamp function disabled. If the time date stamp

is enabled the MDI system data logging memory can

the following; the record number, the measured value

and the engineering units of the measurement value. If

the time/date stamp is enabled the time (hours/minutes/

the logged mea sure ment data.

When used in conjunction with the Event Timer func-

tion (see Section 25) the MDI system can be set up

to take data during a selected future time period at an

operator programmed time interval. For example, the

com bi na tion of data logging and event timer pro vides

the ability to set up the MDI system to take pressure

measurements from 9:00 PM to 11:00 PM at a timed

interval of one data set every 10 seconds, without opera-

tor intervention.

The setup menu for the data logging function is accessed

through a dedicated key on the keypad of the MDI sys-

tem. This key has the designation DATA LOG. Pressing

the data log key provides access to the com plete data

logging set up menu.

When the data log key is pressed the MDI system will

re spond with one of two prompt screens. If the unit is

not equipped with the certi cation generation en hance -

ment the calibrator will display:

(Optional)

Section 22.0 Data Logging Function (Op tion al)

Section 22.2 Setting up the Data Logging

Function (Optional)

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Line 1

Line 2

Line 3

If the MDI system is equipped with the certi cation gen-

eration data logging enhancement the response will be:

To perform “standard” sequential manual or time based

data logging highlight the text “Std” and with it  ashing

on the display press the enter key.

To access the certi cation generation capability of the

MDI, using the right pointing arrow key high light the

text CertGen and with it  ashing press the enter key.

The up/down and left/right arrows can be used to choose

the desired selection from the data log set up menu.

Information on the function of each of the above menu

options follows.

Proceed to section 23 of this manual for details on the

certi cation generation mode of data logging.

Proceed through the balance of Section 22 for details

on the use of the ca pa bil i ties provided by the stan dard

Section 22.3 Labeling Function – Standard Data

The label option allows the input of an alphanumeric

label of up to 16 characters in length. Multiple labels

can be used. For example, a label can be entered and

data taken to be stored under the label. After com ple tion

of the mea sure ment activities to be included under the

 rst label another label may be entered and the next data

mis sion sequence. Label in for ma tion can be viewed on

the MDI system display and is trans mit ted when stored

values are reviewed via the computer upload program

detailed in Section 24.

To enter a label follow the steps below.

Step 1

With the MDI system on and reading pres sure/

temperature, press the data log key on the MDI system

keypad.

In response the MDI system display will respond:

THE LAST DATA LOG MENU SCREEN USED

Step 2

Using the up/down and right/left arrows browse

through the data log menu and locate the word “label”.

The menu line that contains the label function appears as:

Step 3

Using the left/right arrow keys select the word

Label. When selected the word label will  ash.

Step 4

With the word Label  ashing press the enter key.

The MDI system will respond by displaying:

Step 5

Use the Up/down arrows to enter letters,

numbers or a blank and the right/left arrows to move

the cursor to the position in which the character is to be

en tered. When the label information is displayed press

the enter key.

The label is now stored and will appear in se quence with

the corresponding data logged values when the stored

information is viewed on the display or up load ed to a

computer.

The automatic data logging function allows for the

automatic, unattended logging of mea sure ment data. The

data logging process com menc es immediately after the

completion of the set up of the automatic data function

to be performed.

Automatic data logging can be accomplished by the fol-

lowing procedure.

Step 1

With the MDI system on and reading pres sure

press the data log key on the keypad.

The MDI system will respond by displaying:

THE LAST DATA LOG MENU SCREEN USED.

Step 2

Using the up/down and right/left arrows browse

through the data log menu and locate the word “Auto”

The menu line with the word “Auto” appears as:

To initiate automatic, time interval, data logging select

the word “Auto” by using the arrow keys. When selected

Logging Mode

Section 22.4 Automatic Data Logging – Standard

Data Logging Mode

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the word “Auto” will  ash on the display. For manual,

operator controlled, data entry proceed to Section 22.5.

Step 3

With the word ‘‘Auto”  ashing press the

enter key.

The MDI system will respond by displaying:

Step 4

Using the number keys enter the desired time

interval in seconds. The interval may be from 0.1 sec-

onds to 65,000 seconds.

Step 5

After the desired time interval is shown on the

display press the enter key.

Step 6

The MDI system will respond by displaying the

following:

Step 7

Using the arrow key select the desired Quick

Select pressure modules to be monitored and logged.

In this example we have opted to log the output from

both Quick Select pressure modules.

Step 8

With the Quick Select module(s) to be mon i -

tored selected and  ashing press the enter key.

The MDI system will respond by displaying:

Note:

If data storage is done with the time/date stamp

option activated, the MDI system can store 387 sets of

pressure measurements. If data storage is done without

the time/date stamp option activated the MDI system

can store 714 sets of pressure mea sure ments. A data set

is the full package of in for ma tion de ning the logged

output from one module.

Using the arrow keys select the desired storage format.

The desired format will  ash when selected.

In this example we have opted to forego the date/time

Step 9

With the desired format displayed press the

enter key.

The MDI system will immediately begin storing the

pressure data requested at the desired interval until

instructed to stop the data logging process.

Step 10

To stop the data logging process press the Data

Log key. The MDI system will respond by dis play ing:

Step 11

Using the arrow keys select the word off. When

Step 12

With the word “Off”  ashing press the enter

key to disable the data log function.

Automatic, time interval based, data logging has now

been terminated.

Section 22.5 Manual Data Logging – Stan dard

Follow the procedure below to conduct manual, operator

controlled, data logging.

Step 1

With the MDI system on and reading pres sure

press the data log key.

The MDI system will respond by displaying:

THE LAST DATA LOG MENU SCREEN USED

Step 2

Using the up/down and right/left arrows browse

through the data log menu and locate the word “Man u al”.

The menu line with the word “Man u al” appears as:

To initiate manual data logging select the word “Man-

u al” using the arrow keys. When selected the word

“Manual” will  ash on the display.

Step 3

With the word “Manual”  ashing press the

Data Logging Mode

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enter key.

The MDI system will respond by displaying:

Step 4

Using the arrow key select the desired Quick

Select modules to be monitored.

In this example we have opted to log the output from

both Quick Select pressure modules.

Step 5

With the Quick Select module(s) to be mon i -

tored and logged selected and  ashing press the enter

key.

The MDI system will respond by displaying:

Note:

If data storage is done with the time/date stamp

option activated the MDI system can store 387 sets of

pressure measurements. If data storage is done without

the time/date stamp option the MDI system can store 714

ment data include all the data stored to de ne the output

of one module.

Using the arrow keys select the desired storage format.

The desired format will  ash on the display when se-

lect ed.

In this example we have opted to forego the date/time

Step 6

With the desired format selected and  ash ing

press the enter key.

Step 7

The MDI system is now ready to log data on

command. To store a measured pressure,  ow, leak test,

press the data store key.

Step 8

To disable the manual data logging ca pa bil i ty

press the Data Log key.

The MDI system will respond by displaying:

Step 9

Using the arrow keys select the word “Off”.

When selected the word “Off” will  ash.

Step 10

With the word “Off”  ashing press the enter

key to disable the data log function.

Manual, operator initiated, data logging has now been

terminated.

Section 22.6 Review of Stored Data –

Data stored in either the manual or automatic data log-

ging functions can be reviewed on the display of the

MDI system or up loaded to an IBM compatible PC.

For information regarding uploading of stored data to a

personal computer skip to Section 24.0.

The MDI system provides the ability to review, on the

display, the data logged measurement values. To review

Step 1

With the MDI system on and reading pres sure

press the data log key on the keypad.

The MDI system will respond by displaying the

fol low ing:

THE LAST DATA LOG MENU SCREEN USED

Step 2

Using the up/down and right/left arrows browse

through the data log menu and locate the word “Re view.”

The menu line with the word “Review” appears as:

To initiate the review process select the word “Re view”

using the arrow keys. When selected the word “Review”

will  ash.

Step 3

With the word “Review”  ashing press the

enter key.

On In stru ment Display Standard Data Logging Mode

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Step 4

The MDI system will respond by displaying the

last data logged value stored in memory. The display of

the data logged value will appear as follows:

where:

the 1-3 digit number representing the record

number for the data point in the sequence of

logged data.

+12345 = stored mea sure ment value.

eng =

is the en gi neer ing unit of the stored value.

time =

time pressure mea sure ment taken, when

date/time stamp was enabled.

Important Note:

If both the left and right pressure/ ow

or electrical measurements are logged the MDI system

will store the data from the left module or side of the

display in the odd numbered records and the data from

the right module or right side of the display in the even

numbered records. There is no stored indication of right

or left module for the stored data values.

Step 5

To review data logged values use the arrow

keys to browse through the stored values. Pressing the

cor re spond ing arrow key will result in the following ac-

tion in the data log review process.

Key

Re sult

brings the next lowest stored address val ue to

the display.

brings the next highest stored address value to

the display.

direction.

brings  rst data point to display.

mA/V

brings last data point to display.

Step 6

When the review process is complete press the

data log key to return to normal pressure mea sure ment.

Section 22.7 Erasing of Selected Stored Data

In some instances the ability to delete speci c stored

data points can be useful. In particular, this can be the

case when data of questionable integrity has been stored

in the data log memory. The MDI system allows for the

deletion of speci c operator selected stored data points.

There are limitations to this capability.

These lim i ta tions are as follows:

with blank data  elds left where the stored data

points have been deleted.

2) The MDI system will not compress the data to the

new, smaller data set.

3) The newly erased  elds cannot be used for the storage

of new data values until a com plete data erase has

been done.

The process to delete selected data points is as follows:

Step 1

With the MDI system on and reading pres sure

press the datalog key on the MDI system key pad.

In response the MDI system will display:

THE LAST DATA LOG MENU SCREEN USED

Step 2

Using the up/down and right/left arrows browse

through the data log menu and locate the word “Re-

view.” The menu line with the word Review appears as:

Using the arrow keys select the word Review. When

Step 3

With the word review  ashing press the enter

key.

Step 4

Data points may be browsed through by using

the keys as indicated below:

Key

Result

brings the next lowest stored address val ue to

the display.

brings the next highest stored ad dress val ue to

the display.

direction.

brings  rst data point to display.

mA/V

brings last data point to display.

To erase a stored data value press the clear entry key,

designated CE, while the data to be deleted is dis played.

The MDI system will respond by displaying:

Standard Data Logging Mode

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Step 5

To delete the displayed stored data point press

the enter key.

The MDI system will respond by displaying:

Step 6

Using the arrow keys additional data points can

be reviewed and kept or deleted as desired.

Step 7

To exit this function press the data log key.

The MDI system will now resume normal pressure mea-

Section 22.8 Erasing All Stored Data

Step 1

With the MDI system on and reading pres sure

press the data log key.

In response the MDI system will display:

THE LAST DATA LOG MENU SCREEN USED

Step 2

Using the up/down and right/left arrows browse

through the data log menu and locate the word “Erase”.

The menu line with the word Erase appears as:

Step 3

Using the left/right arrow keys select the word

Erase. When selected the word Erase will  ash.

Step 4

With the word Erase  ashing press the enter key.

The MDI system will respond by displaying:

The word cancel will be  ashing. Select the word erase

using the arrow keys to erase stored data.

Step 5

Using the right arrow select the word Erase and

press the enter key.

Pressing the enter key with the erase command  ashing

will irrevocably erase all stored data. If it is required

that any of the stored data be retained select the word

“cancel” and press the enter key on the keypad.

Step 6

To erase all stored data press the enter key.

The MDI system will now resume standard pressure

measurement activities.

The certi cation generation operating mode is de-

signed to simplify the capture of measurement data

taken during the calibration for easy gen er a tion of

cal i bra tion cer ti  ca tion sheets. It has been de signed for

use with FieldLink 2 software. How ev er, even without

the FieldLink 2 software the cer ti  ca tion gen er a tion

mode of data logging will simplify calibration activities.

Per for mance of calibrations will be fa cil i tat ed through

operator prompts provided by the MDI when used in

the enhanced cer ti  ca tion gen er a tion mode. Further, the

ma nip u la tion and use of cal i bra tion data is facilitated by

the en hanced data la bel ing capability provided by this

mode of op er a tion.

Step 1

With the MDI on and displaying mea sure ment

data press the data log key.

The MDI will re spond to the data log entry by dis-

play ing the following.

“Std” represents standard sequential data log ging

with out the bene t of formatting to aid in the cal i bra tion

process. Standard data logging is most com mon ly used

for time based data logging of processes or system con-

trols or sampling of such things as HVAC ducts.

“CertGen” represents the Certi cation Gen er a tion mode

of data logging. This is the mode that is detailed here.

To review or use standard data logging refer to Section

22 of the users manual.

To access the “CertGen” capabilities use the arrow keys

Standard Data Logging Mode

Section 23.0 Certi cation Generation Enhanced

Data Logging Mode

Section 23.1 Set Up and Use of Certi cation Generation Data Logging Mode

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to highlight the text “CertGen” .

Step 2

With the text “CertGen”  ashing press the enter

key.

The MDI will respond by displaying:

The text “CertGen” will be  ashing, indicating that

pressing the enter key will activate the “CertGen” data

logging process.

Selecting and entering the “Exit” option will return the

cal i bra tor to standard measurement activities.

Selecting the text “Erase” will allow deletion of any

previous data logged information. The “Erase” se lec tion

deletes all data logged information, in clud ing any in for -

ma tion stored from either “Std” or “CertGen” operating

modes. If “Erase “ is selected the MDI will respond by

displaying:

Cancel Erase

Selecting “Cancel” will result in the MDI reverting to

basic measurement activities. Selecting “Erase” will

result in the deletion of

ma tion.

Step 3

Using the arrow keys, highlight the text “Cert-

Gen to proceed with the certi cation generation process

”.

Step 4

With the text “CertGen”  ashing on the display

press the enter key.

The MDI will respond by displaying the fol low ing:

This display provides an indication of the ap prox i mate

data logging memory available for storage of ad di tion al

measurement and calibration data. The number of actual

points that may be stored will vary based on the length

of tag names assigned and wheth er or not the ambient

temperature logging option has been exercised.

The percent indication is the percent of data logging

memory used. As data is added to the data log mem o ry

during the data ac qui si tion process the percent level

will increase. This will be seen on the display as each

data set is added to the data log memory. In addition the

com plete memory available summary as shown above

will be displayed each time the “CertGen” process is

initiated.

The MDI can store a minimum of 10 complete cal i bra -

tions including: 10 “as received” data points, 10 “as left”

data points, tag name, ambient tem per a ture at time of

“as found” tests, ambient temperature at time of “as left

tests”and the indication of the action taken.

Step 5

Pressing any key will clear the memory avail-

able summary from the display and allow con tin u a tion

of the “CertGen” process.

After pressing any key the MDI will respond by dis-

play ing the following.

The text “New Tag” will automatically be se lect ed and

be  ashing on the display when the “CertGen” process

is initiated.

Step 6

To initiate the data logging of mea sure ment in-

formation for the generation of a cer ti  ca tion sheet press

the Enter key with the text “New Tag”  ashing.

The MDI will respond by displaying the fol low ing.

Use the up and down arrow keys to enter letters and or

numbers to de ne an instrument tag name. The entry/

is as fol lows:

Up/down arrows provide access as follows:

0, 1, 2, 3, 4, 5,

6, 7, 8, 9, _, A,

B, C, D, E, F, G,

H, I, J, K, L, M,

N, O, P, Q, R, S,

T, U, V, W, X, Y, Z

By maintaining pressure on the up/down arrow the dis-

played number or letter will continue to change until the

last character has been reached.

By pressing and releasing the up/down arrow a single

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The left/right arrow keys allow for entry of alpha nu-

meric data in any of the 16 available positions.

The tag name can be any combination of al pha bet i cal or

numeric entries. The maximum entries per tag name is

The tag name is the key designation under which all

be organized. Tag names or tag numbers are rou tine ly

identi ers assigned to measurement in stru ments when

put into service within a facility. If no tag identi er is as-

one be created by com bin ing some abbreviation for the

man u fac tur er’s name and the instrument serial number

for the device to be tested. The use of the “CertGen”

 rm ware requires the entry of a tag name for each de-

vice to be cal i brat ed.

Use the up/down and left/right arrows to enter a tag

name, as shown here.

Step 7

With the desired tag name dis played press the

enter key.

The MDI will respond by displaying:

The text “AsFound” will be  ashing when this

found” data press the enter key with the text “AsFound”

 ashing on the display.

The MDI will respond by prompt ing the op er a tor to en-

ter the number of “as found” data points to be taken. A

data point consists of the pres sure mea sure ment as read

on the instrument and the current or voltage output from

the device under test as mea sured on the in stru ment.

There fore, each data point is actually two (2) mea sure -

ment values. The prompt appears as follows.

.000000

The number of test points can be any value from 1 to 21.

Important Note:

The MDI can store suf  cient mea-

sure ment data to calibrate 10 devices each with 10 “as

found” and 10 “as left” data points (cor re spond ing to

200 test points. Each test point includes both pressure/

temperature and electrical mea sure ment data). In ad-

di tion to storing the mea sure ment test data the head ing

or label in for ma tion for each cal i bra tion is also stored in

memory. This in for ma tion includes: tag name, am bi ent

tem per a ture, “as found” label, “as left” label and action

taken.

Prior to initiating the calibration process the base unit

will prompt the operator with a screen providing the

re main ing storage capacity for data in terms of number

of data points. If the operator enters a number of test

points that exceeds the available memory the following

message will be displayed:

Pressing any key will return the prompt re quest ing entry

of the number of test points to be run. The number of

test points entered must be less than or equal to the

remaining test points avail able. Memory requirement for

the cal i bra tion heading information are already factored

into the information provided regarding the number of

test points remaining. The number displayed may be

completely allocated to measurement data without worry

about leaving space for needed labelling.

Step 8

Using the numeral keys enter the desired

number of “as found” data points to be logged. In this

example 10 data sets will be stored in the cal i bra tor’s

data logging memory.

Step 9

With the desired number of test points entered

and displayed press the enter key.

The MDI will respond by returning basic mea sure ment

operation.

Step 10

Prior to beginning the collection of data the

MDI should be set up to display the in for ma tion to be

logged in the MDI’s memory. For ex am ple, in stan-

dard trans mit ter calibration the cal i bra tor display will

routinely display the measured value from the Quick

Select pressure module being used as the pres sure

from the transmitter (input to the mA and COMM jacks

on the calibrator front panel) as a result of the pres sure

input applied to the transmitter. Therefore the MDI will

typ i cal ly be dis play ing either of the two following sets

of in for ma tion when per form ing the calibration process.

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where:

yyyy=

the pres sure mea sure ment value

the current measurement value

Step 11

With the data to be logged shown on the dis-

play, introduce the  rst pressure/temperature mea sure -

ment to be logged. After the system has stabilized press

the data store key.

The MDI will brie y show the following in for ma tion

on the display each time a mea sure ment set is logged to

memory.

where:

the number of data points (records) and data

 elds used for cal i bra tion labelling in for -

ma tion stored in

this

calibration data set.

yy =

the percent of data logging memory allocated

to stored data.

the measured values in the en gi neer ing units

chosen.

Step 12

Repeat the process, subjecting the MDI

and the device under test to the con trolled pressure/

tem per a ture input for each test point to be taken and

for each mea sure ment set to be logged.

After the last set of data to be logged has been stored the

MDI will prompt the operator with the following display.

The options available are as follows:

View:

Allows operator to scan through the stored values

using the arrow keys. Use the left pointing arrow

to move in decreasing order from data point to

data point. Use the down-ward pointing arrow

to move in de creas ing order 10 data points at a

time. Use the right pointing arrow to move in in-

creasing order from data point to data point. Use

the upward pointing arrow to move in in creas ing

order 10 data points at a time.

Done:

Completes the collection of “AsFound” mea-

sure ment data. See step 13 for continuation of

the “CertGen” process.

Redo:

Provides the ability to discard all the “As Found”

data taken under the tag name being test ed. Prior

to deleting the data the op er a tor will be prompted

by the query.

Selecting yes will result in the deletion of the just taken

“as found data”.

Step 13

After selecting “Done” the MDI will

offer the opportunity to enter the ambient (en vi ron -

men tal) tem per a ture at the time the cal i bra tion is being

done. This is accomplished by the display of the follow-

ing.

To skip the act of logging the ambient temperature value

To “capture” the ambient temperature and make it part

of the calibration record use the arrow keys to select the

text “Enter”.

Step 14

To proceed with the entry/recording of the

ambient temperature value with the text “Entry”  ashing

press the enter key.

Step 15

Note

mod-ule and the probe is installed it will au to mat i cal ly

offer the opportunity to store the measured temperature

value.

If a different value is to be entered or if the MDI is not

equipped with a temperature module the tem per a ture

can be entered via the numeral keys on the keypad. With

manual tem per a ture entry com plet ed the display will

look as follows:

73.4

for an ambient temperature of 73.4 degrees Fahr en heit.

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Step 16

With the desired temperature value

dis played press the enter key.

The MDI will respond by displaying:

Using the arrow keys select the desired course of action.

None:

if no action is required and the device under test

is performing satisfactorily.

Recal:

If ad just ments are to be made to the device un der

test.

Repl:

If it has been determined that the tested de vice

must be taken off line and replaced.

The selected entry will become part of the stored data

for the calibration being done against the previously

entered tag name.

Step 17

With the desired selection highlighted press the

enter key.

The MDI will respond by displaying:

Use the arrow keys to highlight the desired selection.

The

typical

Yes:

If recalibration is selected as the ac tion taken.

Proceed to Step 18 for details on taking “As

Left” data.

No:

If replace is selected as the action taken.

AsFnd:

If no action is taken because the device under

test was found to be within speci cation.

Selecting “AsFnd’’ will result in the following com-

ment being added to the calibration record for the device

under test:

“Use AF for AL”

Step 18

To take “As Left” data and store the

mea sured values in the MDI’s memory use the arrow

key to high-light the text “yes” under the “As Left” data

prompt screen.

Step 19

With the text “yes”  ashing press the enter key

The MDI will respond by displaying:

Step 20

Use the numeral keys to enter the num ber of “as

left” data records to be stored. The number selected can

be any value be tween 1 and 21. In this example 5 “As

Left” data records will be taken and stored in the MDI’s

memory.

Step 21

Be certain that the desired data to be logged

is show

n on the MDI’s display. With the data to be

logged shown on the display, apply the  rst pres sure/

tem per a ture measurement to be logged. After

the sys-

tem

has stabilized, press the data store key.

The MDI will brie y show the following display.

where:

xx =

the number of data sets (records) stored in

this

calibration data set.

yy =

the percent of data logging mem o ry allocated

to stored data.

the measured values in the en gi neer ing units

chosen.

Step 22

Repeat the process, subjecting the

MDI and the device under test to the con trolled pressure/

temperature input for each test point to be taken and

for each mea sure ment set to be logged.

After the last set of data to be logged has been stored the

MDI will prompt the operator with the following display.

The options available are as follows:

View:

Allows operator to scan through the stored values

using the arrow keys. Use the left pointing arrow

to move in decreasing order from data point to

data point. Use the downward pointing arrow

to move in decreasing order 10 data points at a

Page 57

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time. Use the right pointing arrow to move in in-

creas ing order from data point to data point. Use

the upward pointing arrow to move in increasing

order 10 data points at a time.

Done:

Completes the collection of “As Found” mea-

sure ment data. See step 13 for continuation of the

“CertGen” process.

Redo:

Provides the ability to discard all the “As Found”

data taken under the tag name being test ed. Prior

to deleting the data the op er a tor will be prompted

by the query.

Selecting yes will result in the deletion of the just taken

“as left”data.

Step 23

After selecting “Done” the MDI will

offer the opportunity to enter the ambient tem per a ture at

the time the “as Left” calibration is done. This is accom-

plished by the display of the following prompt screen.

Enter

To skip the logging of the temperature in for ma tion select

the text “Skip” and press the enter key.

To “capture” the ambient temperature and make it part

of the calibration record use the arrow keys to select the

text “Enter”.

Enter

Step 24

To proceed with the entry/recording

of the ambient temperature value with the text “Enter”

 ashing press the enter key.

Step 25

Note

per a ture module installed, it will automatically offer the

op por tu ni ty to store the measured value the base unit is

re ceiv ing from the RTD or thermocouple.

If a different value is to be entered or if the MDI is not

equipped with an RTD probe and GQS-RT module the

temperature can be entered via the numeral keys on the

keypad. With manual tem per a ture entry completed the

display will look as follows:

for an ambient temperature of 73.4 degrees Fahr en heit.

Step 26

With the desired temperature value

dis played press the enter key.

The MDI will respond by displaying the fol low ing:

Using the arrow keys select the desired course of action.

Select:

None:

if no action is required and the device under test

is performing satisfactorily.

Recal:

If ad just ments are to be made to the device un der

test.

Repl:

If it has been determined that the tested de vice

must be taken off-line and replaced.

The selected entry will become part of the stored data

for the calibration being done against the pre vi ous ly

entered tag name.

Step 27

With the desired selection highlighted

press the enter key.

After completion the MDI will once again display the

memory available summarization screen as follows:

Points left

This display provides an indication of the ap prox i mate

data logging memory available for storage of ad di tion al

measurement and calibration data.

Step 28

Press any key to return to the  rst “CertGen”

Screen as follows:

Highlighting and selecting:

New Tag:

will result in ini ti at ing a new cal i bra tion

cer ti  ca tion process.

Previous Tag:

will allow the review of data pre vi ous ly

taken for speci ctag names.

Press the clear entry key to return to standard MDI mea-

sure ment and test activities.

Section 24.0 MDI System Set Up for Uploading

IBM Compatible PC

Stored Data Into an

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The following steps will allow you to upload stored data

to an IBM compatible PC.

Step 1

Turn the power off on the base unit.

Step 2

Connect the 9 pin RS232 cable to the MDI

Step 3

Turn the power to the base unit on and with the

MDI system on and reading pressure press the setup key.

Step 4

Using the arrow keys locate and select the text

RS232. When selected the text RS232 will  ash.

Step 5

With the text RS232  ashing, press the enter key.

The MDI system will respond by displaying:

Step 6

Using the arrow keys select the word Enable.

When selected the word Enable will  ash.

Step 7

With the word Enable  ashing press the

enter key.

The MDI system will respond by displaying:

Step 8

Using the left/right arrow keys select the de-

In the above example 9600 baud has been selected.

Step 9

With the desired baud rate  ashing press the

enter key.

The MDI system will respond by displaying:

Step 10

In order to use the upload software provided

with the MDI system use the arrow keys to select the

text ISO1745. When selected the text ISO1745 will  ash.

Step 11

With the text ISO1745  ashing press the

enter key.

The MDI system is now set up for data logging. Next,

the computer to be used for uploading must be prepared.

Section 24.1 Installing and Operating Up load

Important

Note:

Information regarding the in stal la tion

and use of the upload utility software is pro vid ed in the

uct. Please consult the User’s Manual for the Upload

Utility shipped with the MDI system.

When the display indicates that the battery back up is

low the lithium battery should be replaced as soon as

possible. The battery is a standard 3 volt lithium battery.

Re place ment should be made with a Panasonic BR1225

or CR1220 battery.

Replace battery with recommended batteries only. Use

of another battery may present a risk of  re or ex plo sion.

Re place ment batteries are available through most indus-

trial supply and elec tron ic supply distributors. Caution,

battery may explode if mistreated. Do not recharge,

disassemble or dispose of in  re.

Note:

2- Pollution degree 2

***CAUTION***

This procedure should only be performed by a trained

electronic technician. The MDI incorporates CMOS

components that can be dam aged by elec tro stat ic

dis charge. Tech ni cians per form ing battery re place ment

must be properly grounded to avoid dam ag ing sensitive

electronic com po nents.

Follow the procedures below to change the battery back

up unit.

Note:

The MDI system should be turned off prior to

initiating battery replacement procedure.

Step 1

Turn the MDI indicator bottom side up and

locate the four (4) phillips head screws that secure the

upper and lower case halves together.

Section 24.2 Battery Back Up Replacement

Software

Page 59

Revision 4.3 3/2004

Step 2

Remove and place aside the four Phillips head

Step 3

Holding the two case halves together, turn the

instrument over (right side up) and slip off the top of

the case.

Step 4

Note the orientation of the cables and the con-

nector used for each cable. Then, carefully dis con nect

the two ribbon cables. One cable con nects the keypad to

the main board and the second con nects the display to

the main board.

Step 5

Locate battery to be replaced. The battery unit

is near connection P6, immediately to the right of pin 10.

Step 6

Remove depleted battery and install re place -

ment unit. Be certain to install appropriate 3 volt lithium

battery as outlined in introduction to this section.

Step 7

Remove jumper on connection P6 between pin

7 and pin 8. Wait 2-3 seconds and reinstall jumper in

original location.

Step 8

Carefully reconnect cable between printed

circuit board and keypad.

Step 9

Carefully reconnect cable between printed

circuit board and display.

Step 10

Replace top half of case.

Step 11

Holding the two case halves together, turn the

unit over (bottom side up).

Step 12

Reinstall four (4) screws used to connect the

top and bottom sections of case.

Step 13

Follow steps in Section 3.5 to reinstall the

desired Quick Select pressure modules.

Step 14

Power unit up and down three (3) times to en-

able the battery backup logic.

Battery replacement is now complete.

Section 25.0 Event Timer Function

The Event Timer allows for unattended data logging dur-

ing a desired time period. For example, if it is nec es sary

to monitor the pressure levels of a  ue or HVAC duct

during a speci c time period the Event Timer, used in

combination with the data logging function, can satisfy

this requirement.

Delayed initiation of unattended measurement ac tiv i ties

requires the set up of

BOTH

the Event Timer and data log-

ging function.

To program the MDI system for delayed monitoring and

data logging follow the steps below.

The event timer sets the starting and ending times for

unattended monitoring to be performed during a future

time period. The Event Timer function is programmed as

follows.

Step 1

With the MDI system on and measuring pres-

Step 2

Using the arrow keys select the event timer,

designated EvntTimr, option on the set up menu. When

Step 3

With the text EvntTimr selected and  ashing on

the display press the enter key.

The MDI system will respond by displaying:

where:

HH =

hours in military time

minutes (0-60)

SS =

Use the number keys to enter the hours, minutes and

Step 4

When entered the start time will look as follows

for a time of 9:30 PM.

Step 5

When the desired start time has been input and

appears on the display press the enter key.

The MDI system will respond by displaying:

Step 6

Enter the desired stop time using the number

keys. When properly entered a stop time of 11:30 PM

will look as follows:

Step 7

When the desired stop time has been input and

appears on the display of the MDI system press the

enter key.

Section 25.1 Event Timer Set-Up

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The MDI system will respond by displaying:

Step 8

Use the right arrow key to select the word En-

able. When selected the word Enable will  ash on the

display.

Step 9

With the word Enable  ashing press the enter

key.

Section 25.2 Data Log Set Up for Operation

Automatic data logging must be set up to control the

data logging parameters to be followed in time delayed

data logging. For delayed data logging the logging func-

tion must be set up as follows.

Step 1

With the MDI system on and reading pres sure

press the data log key.

The MDI system will respond by displaying the fol low ing:

THE LAST DATA LOG MENU SCREEN USED

Step 2

To program the MDI system for time de layed

data logging use the arrow keys to locate and select the

word “Auto” in the data log menu. When se lect ed the

word Auto will  ash on the display.

Step 3

With the word Auto  ashing press the enter

key.

The MDI system will respond by displaying:

Step 4

Using the number keys enter the desired time in-

terval in seconds. The interval may be from 0.1 seconds

to 65,000 seconds.

The above example shows an interval of 600 seconds or

Step 5

After the desired time interval is entered and

The MDI system will respond by displaying the fol low ing:

Step 6

Using the arrow key select the desired Quick

Select Modules to be monitored.

In the above example the left module has been des ig -

nat ed as the Quick Select Module to be mon i tored for

data logging.

Step 7

With the Quick Select module(s) to be mon i -

tored selected and  ashing press the ENT key.

After the Quick Select pressure module(s) to be mon i -

tored has been entered the MDI system will respond by

dis play ing:

Note:

If data storage is done with the time/date stamp

option the MDI system can store 387 sets of pressure

measurements. Sets of pressure mea sure ment data in-

clude pressure measurement from the left, right or both

modules.

If data storage is done without the time/date stamp

option the MDI system can store 714 sets of pressure

mea sure ments. Sets of pressure measurement data in-

clude pressure measurement from the left, right or both

modules.

Step 8

Using the arrow keys select the desired storage

format. The desired format will  ash on the display

when selected.

In the above example the date time stamp function has

been enabled and the stored data will be labeled with

time date information in the database.

Step 9

With the desired format displayed press the

enter key.

After pressing the enter key immediately turn the MDI

with the Event Timer

Page 61

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When the event timer and data log functions are set up

as outlined in Section 25, the MDI system will au to mat i-

cal ly turn itself on and make the pro grammed mea sure -

ments over the desired time in ter val. At the conclusion

of the programmed monitoring period the MDI system

will au to mat i cal ly turn itself off.

To review logged data or perform any other data log-

ging functions such as data labeling or uploading to a

personal computer see the main data logging section

Section 26.0 Alarm Function – Overview

The MDI system can be equipped with a set of single

pole single throw (SPMDI) relays for use in trig ger ing

an nun ci a tor lights, fans, sirens, etc. The relays have the

fol low ing speci cations:

Parameter

Speci cation

Switch Arrangement:

Form C

Resistance (max):

50 micro ohms

Switching Power (max):

30 W, 62.5 VA (resistive

load)

Switching Voltage (max):

Switching Current (max):

Switching Capability (min):

The relay contact closures are accessed through the 9 Pin

female D connector on the right side of the MDI system.

Pin out information for set point contacts is as follows:

Pin 1 Relay 1 common

Pin 7 Relay 1 (normally open or normally closed)

Pin 8 Relay 2 common

Pin 9 Relay 2 (normally opened or normally closed)

The alarm level trip points can be pro grammed from the

keypad as follows.

Step 1

With the MDI system on and reading pres sure

press the SET UP key.

Step 2

Using arrow keys select the alarm function

from the setup menu. When selected the word “Alarm”

will  ash on the display.

Step 3

With the word Alarm  ashing press the enter key.

This is an optional feature, if the option is not in stalled

the MDI system will respond with:

If this message appears press any key to resume normal

operation.

Step 4

After pressing the enter key the display will read:

To set alarm levels, using the arrow keys, select the word

Enable. When selected the word will  ash.

Step 5

With the word “Enable”  ashing press the enter key.

Step 6

After pressing the enter key the MDI system

will query:

Important Note

a setpoint of 10 is entered the alarm relay will trip when

measured and displayed pressure exceeds the nu mer i cal

value of 10. The MDI system will not au to mat i cal ly

convert the entered trip point to a new nu mer i cal value

to re ect a change in en gi neer ing units.

Step 7

Using the number keys, enter the alarm level

from left to right, including any decimal point. In this

example a high setpoint of 10 has been selected.

Step 8

After the desired alarm value has been keyed

(Optional Feature)

Section 26.1 Alarm Set Up

Page 62

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Step 17

When the desired con guration has been

enter key.

Step 18

After the enter key has been pressed the MDI

This will determine whether the MDI system is mon-

i tor ing the left or right Quick Select pressure or tem-

per a ture mod ule. Using the arrow keys select the desired

pressure module to be monitored.

Step 19

Use the left/right arrow keys to select the

desired module to be monitored. In this example the left

module has been identi ed for monitoring.

Step 20

With the desired module selected and  ash ing,

press the enter key.

The alarm function is now armed and operating. This

function is automatically disabled when the MDI system

is turned off and must be re-initiated by enabling the

alarms via the set up menu.

Section 27.0 Recerti cation of the Cal i bra tor

Both the base unit and the pres sure modules can be

recalibrated and re cer ti  ed in the  eld. The base unit

in cludes a  rm ware based, menu driv en pro ce dure that

pro vides op er a tor prompts to fa cil i tate the recalibration

pro cess. The pro ce dure en com pass es both the ac qui -

recalibration of the base unit and modules. The re cer ti f-

i ca tion pro gram is ac cess ed via the set up menu key.

The calibration data is pass word pro tect ed with an ac-

cess code. The recalibration ac cess code is dif fer ent

than the owner ac cess code. Both of the ac cess codes

are pro vid ed with the MDI at time of ship ment and are

lo cat ed on the base unit and the cal i bra tion cer ti cate. If

the ac cess code has been lost con tact the fac to ry and be

pre pared to pro vide the se ri al num ber of the base unit.

The se ri al num ber is lo cat ed on the prod uct la bel on the

underside of the base unit.

and is seen on the display press the enter key.

Step 9

The MDI system will respond by displaying the

following:

If Open is selected, the high limit contact will be open

when the measured pressure exceeds the setpoint value.

If Close is selected, the contact will close if the setpoint

is exceeded.

Step 10

Using the arrow keys select the desired me-

chan i cal con guration. When selected the con  g u ra tion

type will  ash. In this example we have con gured the

exceeded.

Step 11

With the desired con guration selected and the

text is  ashing on the display, press the enter key.

Step 12

After pressing the enter key the MDI system

will respond.

Step 13

Using the number keys on the keypad, enter the

desired alarm level from left to right including decimal

point. In this example a low setpoint of one (1) has been

Step 14

After the desired alarm value has been keyed

and appears on the display press the enter key.

Step 15

The MDI system will respond by displaying the

following:

If Open is selected, the low limit contact will be open

when the measured pressure exceeds the setpoint value.

If Close is selected, the contact will close if the setpoint

is exceeded.

Step 16

Using the arrow keys select the desired me-

chan i cal con guration. In this example we have con-

 g ured the system to close the relay contact when the

Section 27.1 Access Codes

Page 63

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Section 27.2 Calibration/Recerti cation Over view

The base unit cal i bra tion  rm ware pro vides a means

of lin ear iza tion and re cer ti  ca tion of pres sure modules

and the base unit’s elec tri cal in put (Vdc/mA) cal i bra tion

ref er ence. In ad di tion, the base unit employs a pre ci sion

can be cal i brat ed. The cal i bra tion of this ref er ence

is crit i cal to en sure the com bined out put of pres sure

module and base unit is with in rat ed accuracy.The fol-

low ing equip ment is re quired to per form recalibration or

re cer ti  ca tion of the MDI.

pre ci sion volt age sup ply

ca pa ble of pro vid ing

Pri ma ry pres sure stan dard

with an ac cu ra cy rat ing

of 4:1 com pared to the rat ing of the pres sure module

to be test ed.

Test leads

with ba nana jacks and mini clips.

Recommended

- Model CQS cal i bra tion quick se lect

module. Al though recalibration and re cer ti  ca tion

work can be per formed with out it, this module will

great ly sim pli fy the pro cess and re duce risk of dam age

to the base unit.

Please note. The fol low ing con ven tion is used when

re fer ring to modules or mod ule bays in this procedure.

Module Bay #1 Module Bay #2

Step 1

Remove any in stalled measurement modules.

If the CQS cal i bra tion module is to be used, in stall it in

module bay #1 at this time.

Step 2

Turn pow er on and al low for at least 15 min utes

warm up time.

Step 3

With the MDI pow ered up and dis play ing a

dashed line across the dis play, press the set up key.

Step 4

Using the ar row keys lo cate the text “Calib” in

the set up menu.

Using the ar row keys se lect the text “Calib” from the

Step 5

With the text “Calib” dis played and  ash ing

press the en ter key.

Step 6

The MDI will re spond by dis play ing:

.00000

Step 7

Enter the 5 dig it cal i bra tion ac cess code pro-

vid ed with the base unit.

12345

Note:

The ac cess code is spe ci c for the base unit be ing

used. The code is pro vid ed on the cer ti  ca tion sheet that

ac com pa nied the prod uct ship ment from the fac to ry.

See sec tion 27.1 “Access Code” for in for ma tion on lost

pass words.

Step 8

With the cor rect ac cess code dis played press

the en ter key.

The MDI will re spond by dis play ing:

The elec tri cal cal i bra tion pro cess al lows for the cal i -

bra tion of the cur rent and volt age in put mea sure ment

ca pa bil i ty of the base unit and cal i bra tion of the 0/1 vdc

an a log com po nent of the in ter face be tween the base unit

and the Quick Se lect module in use.

Step 9

When this screen ap pears, the word “Elec tri cal”

for elec tri cal re cer ti  ca tion is al ready  ash ing. There fore,

press the en ter key to com mence the elec tri cal cal i -

bra tion.

The MDI will re spond by dis play ing:

Section 27.3 Required Equipment

Section 27.4 As Recieved Readings of the Base Unit Electronics

Page 64

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Step 13

The val ue dis played un der the dashed line

rep re sents the as re ceived read ing for the 1 Vdc mea-

sure ment. The read ing will look as fol lows:

base unit to be with in spec i  ca tion)

Af ter tak ing note of the read ing press the en ter key to

pro ceed to the next as re ceived read ing. The MDI will

re spond by dis play ing the fol low ing

This is used for cal i bra tion of the 20 mA mea sure ment

ca pa bil i ty. The measured val ue must be with in 0.03%

of the ap plied volt age for the cur rent mea sure ment to be

with in the 0.03% of full scale spec i  ca tion

Step 14

To check the measured volt age us ing a pre-

ci sion volt age source:

To ap ply the 0.1 Vdc sig nal use the same pro ce dure as

out lined in steps 11 and 12 of this sec tion.

Step 15

The val ue dis played un der the dashed line

rep re sents the as re ceived read ing for the 1 Vdc mea-

sure ment. The read ing will look some thing like fol lows:

Take note of the measured val ue.

Step 16

To re peat tak ing the as re ceived read ings press

the en ter key to re turn to the 1.0 Vdc as re ceived read ing

CE key.

As re ceived read ings for the mA and Voltage mea sure -

ments per formed through the miniature ba nana jacks on

the in stru ment key pad can be done by sim ply set ting the

base unit up to measure the elec tri cal pa ram e ter (cur-

rent or volt age) to be test ed and in put ting a se ries of

known val ues to the cor rect jacks. Refer to Sec tion 7.0

to de ter mine the set up pro ce dure for the measurement

of cur rent and/or volt age in puts.

As re ceived read ings are now com plet ed.

Step 1

With the MDI on and dis play ing pres sure mea-

Step 10

To per form “as re ceived” read ings use the down

ar row key to se lect Reference Check. When se lect ed

the text “Reference Check” will  ash on the dis play. To

cal i bra tion skip to Sec tion 27.5.

Reference Check

Step 11

With text Reference Check Flash ing press the

Enter Key.

The MDI will re spond by dis play ing:

*****WARNING*****

If the volt age stan dard is set to a lev el in ex cess of the

rec om mend ed cal i bra tion in put or is con nect ed to in cor -

rect pins or in con tact with pins ad ja cent to the spec i  ed

in put pins during the cal i bra tion pro cess the base unit

elec tron ics may be dam aged. Use ex treme cau tion when

con nect ing test leads and ap ply ing test volt age in puts.

The Model CQS Calibration Quick Se lect module is

avail able to sim pli fy con nec tion of the volt age stan dard

to the base unit. The module pro vides ba nana jack con-

nec tions for the in put of the volt age stan dard to the MDI

base unit.

Step 12

To check the measured volt age us ing a pre-

ci sion volt age source ap ply 1.00000 volt ±50 microvolts.

Do not use a volt age less than or great er than 1 volt

±50 microvolts.

When the MDI is ready to measure the

ref er ence volt age it will dis play:

These pins are lo cat ed in the con nec tor in module

bay #1 as shown be low.

To ap ply the 1 Vdc sig nal to the MDI con nect the pre-

ci sion volt age gen er a tor so that the pos i tive line is con-

nect ed to pin 7 and the ground is con nect ed to Pin 6.

RS 232

Section 27.5 Adjustment/Calibration Base Unit Electronics

Page 65

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Step 2

Using the ar row keys lo cate the text “Calib” in

the set up menu.

Using the ap pro pri ate ar row keys se lect the text “Calib”

from the set up menu.

Step 3

When the cal i bra tion func tion has been se lect ed

it will  ash on the dis play.

Step 4

With the text “Calib” dis played and  ash ing

press the en ter key.

Step 5

The MDI will re spond by dis play ing:

Step 6

Enter the 5 dig it cal i bra tion ac cess code pro-

vid ed with the MDI base unit.

Step 7

With the cor rect ac cess code dis played press

the en ter key.

The MDI will re spond by dis play ing:

The elec tri cal cal i bra tion pro cess al lows for the cal i -

bra tion of the cur rent and volt age in put mea sure ment

ca pa bil i ty of the base unit as well as the cal i bra tion of

the 0/1 Vdc an a log com po nent of the in ter face be tween

the base unit and the Quick Se lect module in use.

Step 8

Use the ar row keys to se lect the word “elec-

tri cal”. When se lect ed the word will  ash on the

in stru ment dis play.

Step 9

When this screen ap pears, the word “Elec tri cal”

for elec tri cal re cer ti  ca tion is al ready  ash ing. There fore,

press the en ter key to com mence the elec tri cal cal i bra tion.

The MDI will re spond by dis play ing:

Step 10

Select the text “Calibration”, when se lect ed the

word cal i brate will  ash on the dis play

Step 11

With the text “Calibrate”  ash ing

press the en ter key.

Step 12

Using a pre ci sion volt age source ap ply 1.00000

volt (+50 mi cro volts ap plied volt age should, at a min-

i mum, equal 1.0 volt. Do not ac cept a volt age less than

plus 50 mi cro volts) to pin 7 of the sen sor con nec tion

plug lo cat ed in the right (look ing into the MDI with the

unit in the up right po si tion and the module bays near est

the op er a tor) module bay of the base unit. Connect the

ground for the volt age source to pin 6.

Looking into the

right

module bay (when looking at the

MDI from behind)

pin 7 is the 2nd pin from the top in

the right column. In the left column, pin 6 is the cen ter

pin, third from the top or bottom of the column.

These pins are lo cat ed in the con nec tor in module

bay #1 as shown be low.

*****WARNING*****

Volt age lev els in ex cess of the rec om mend ed cal i bra tion

in put, in cor rect pin con nec tion or con tact with pins

ad ja cent to the spec i  ed in put pins dur ing the base unit

cal i bra tion pro cess may dam age the unit. Use ex treme

cau tion when ap ply ing volt age sig nals to the base unit.

An ac ces so ry cal i bra tion module is avail able to sim pli fy

con nec tion of the volt age stan dard to the base unit. This

module is model CQS Calibration Quick Se lect module.

This module pro vides ba nana jack con nec tions for the

in put of the volt age stan dard to the MDI base unit.

Step 13

The MDI will dis play the fol low ing:

With 1.00000 volt (±50 mi cro volts) ap plied press the

en ter key.

Page 66

Revision 4.3 3/2004

After com ple tion of the ad just ments for the 30.0000 volt

in put the MDI will dis play:

Step 18

Using a pre ci sion cur rent gen er a tor ap ply a

20.0000 mA (±5 microamps) in put to the mA jacks.

Use the COM and mA jacks on the MDI key pad.

Step 19

When the prop er cur rent is be ing ap plied press

the en ter key.

The MDI will re spond by dis play ing:

Af ter com ple tion of the 20 mA re cer ti  ca tion the MDI

will dis play:

Step 20

Using the left/right ar row keys se lect “Save” to

write the new data to the EEPROM cal i bra tion stor age.

To dis card the elec tri cal read ings se lect Cancel.

Se lect ing and en ter ing the word “Save” will over write

the cal i bra tion data pre vi ous ly stored in EEPROM

memory. Previously stored cal i bra tion data will be per-

ma nent ly destroyed.

Step 21

With the de sired se lec tion  ash ing (Save or

Cancel) press the en ter key.

Step 22

If “can cel is se lect ed the MDI will exit the

cal i bra tion mode. If “save” is se lect ed the cal i bra tor will

prompt you to en ter the date of the new cal i bra tion as

follows:

Step 23

Using the num ber keys en ter the cur rent date

For March (03), elev enth (11), 1996

Step 24

With the de sired date en tered and dis played,

press the en ter key.

The MDI will re spond by dis play ing:

The word “working”  ash es as the MDI makes the nec-

es sary in ter nal ad just ment to cal i brate the volt age mea-

sure ment elec tron ics to 1.0000 volts.

The read ing must

be within ±0.005%FS (.99995 to 1.00005 Vdc) for base

unit to be with in spec i  ca tion. The ref er ence check

mode can be used to ver i fy cal i bra tion ac cu ra cy.

After com ple tion of the ad just ments for the 1.00000 volt

in put the MDI will dis play:

With 0.100000 volt (±50 mi cro volts) ap plied press the

en ter key.

The MDI will re spond by dis play ing:

Af ter the MDI com pletes auto-ad just ing the mea sured

val ue it will dis play:

Step 14

Using a pre ci sion volt age gen er a tor ap ply a

re cessed ba nana jacks. Use the COM and V jacks on the

cal i bra tor key pad.

Step 15

When the prop er volt age is be ing ap plied press

the en ter key.

The MDI will re spond by dis play ing:

Af ter com ple tion of the ad just ments for the 10.0000 volt

in put the MDI will dis play:

Step 16

Using a pre ci sion volt age gen er a tor ap ply a

30.0000 volt (±3 mil li volts) in put to the volt age jacks.

Use the COM and V jacks on the MDI.

Step 17

When the prop er volt age is be ing ap-

plied press the en ter key.

The MDI will re spond by dis play ing:

Page 67

Revision 4.3 3/2004

Step 25

Turn off the MDI and in stall the

de sired Quick Se lect pres sure module per in struc tions

pro vid ed in Sec tion 3.2.

Step 26

Turn on theMDI to re sume gen er al pres sure

measurement ac tiv i ties.

Note:

During elec tri cal re cer ti  ca tion any of the cal i -

bra tion rang es may be skipped by press ing the clear en-

try (CE) key. When the clear en try key is pressed dur ing

the elec tri cal cal i bra tion pro cess the MDI will ad vance

to the next elec tri cal in put in the cal i bra tion sequence.

Section 27.6 Recerti cation of Quick Select

The MDI is avail able in a se lec tion of ac cu ra cies from

±0.1% of span through ±0.025% of span, cov er ing

rang es from 0.25 inch es of water to 10,000 psi. Where as,

the MDI can be cal i brat ed in the  eld, appro-priate pres-

sure stan dards must be used to as sure the accu-racy of the

MDI sys tem is not de grad ed by the cal i bra tion pro cess.

As rec om mend ed by stan dards or ga ni za tions such as

A.S.M.E., N.I.S.T and var i ous U.S. and world gov ern -

ment agen cies cal i bra tion stan dards should be at least 4

times more ac cu rate than the de vice to be cal i brat ed.

Therefore, if you will be cal i brat ing a ±0.1% of span

Quick Se lect pres sure module, a stan dard of equiv-

a lent range would have to have an ac cu ra cy of at least

±0.025% of span. If the stan dard to be used is of a

high er range than the Quick Se lect pres sure module to

be cal i brat ed, even great er ac cu ra cy is re quired. For ex-

am ple, if a ±0.1% of span Quick Se lect pres sure module

with a range of 50 psi is to be cal i brat ed with a 100 psi

i mum ac cu ra cy of ±0.0125% of span.

To re cer ti fy a Quick Se lect pres sure module fol low the

pro ce dure out lined be low.

Step 1

With the pow er to the MDI off in stall the Quick

Se lect pres sure module to be cal i brat ed in the left mod-

ule bay (look ing down on the unit with the key pad up

and the dis play at the top).

Step 2

Pow er up the MDI sys tem by press ing the

on/off key.

Step 3

Set the left side of the dis play for the en gi -

neer ing units to be used for the cal i bra tion pro cess.

In for ma tion on en gi neer ing unit se lec tion is pro vid ed in

Sec tion 8, En gi neer ing Unit Se lec tion.

Step 4

With the MDI on and dis play ing pres sure mea-

Step 5

Using the ar row keys lo cate the text “Calib” in

the set up menu.

Select the text “Calib”. When se lect ed the text will  ash

on the dis play.

Step 6

With the text “Calib” dis played and  ash ing

press the en ter key.

Step 7

The MDI will re spond by dis play ing:

Step 8

Enter the 5 dig it cal i bra tion ac cess code pro-

vid ed with the MDI base unit.

Step 9

With the cor rect ac cess code dis played press

the en ter key.

The MDI will re spond by dis play ing:

Step 10

Using the down ar row key se lect the word

“Pres sure”. When se lect ed, the word Pres sure will  ash

on the dis play:

Step 11

With the word “Pres sure”  ash ing

press the en ter key.

The MDI will re spond by dis play ing:

Step 12

To per form zero cal i bra tion (ad just ment) se lect

Yes and press the en ter key.

To skip zero ad just ment and pro ceed to full scale cal i -

bra tion (ad just ment) se lect No and press the en ter key.

Step 13

With the pres sure module at zero pres sure,

press the en ter key.

Pres sure Modules

Page 68

Revision 4.3 3/2004

Quick Se lect module when cal i bra tion ac tiv i ties com-

menced.

In the above ex am ple a pres sure of 100.01 is be ing ap-

plied to the left Quick Se lect pres sure module.

Step 17

With the full scale (F.S.) pres sure ap-

plied and the cor re spond ing val ue shown on the dis play,

press the en ter key.

The MDI will re spond by dis play ing:

Step 18

If cal i bra tion ac tiv i ty is to be lim it ed to zero

and span, us ing the ar row keys se lect the word No (when

lin ear i ty ad just ment is to be per formed pro ceed to Step

21.

Step 19

With the word No  ash ing press the

en ter key.

The MDI will re spond by dis play ing:

Save

Step 20

To save the new zero and span val ues to mem-

o ry, there by over writ ing the pre vi ous ly stored val ues

in the EEPROM, se lect the word “Save” and press the

en ter key. To dis card in for ma tion and re tain the in for -

ma tion cur rent ly in the EEPROM of the cal i bra tor se lect

“Cancel” and press the en ter key . If the save op tion

is se lect ed pro ceed to Step 21. To re-lin ear ize module

pro ceed to Step 26.

Step 21

If “can cel” is se lect ed the MDI will exit the

cali-bration mode. If “save” is se lect ed the cal i bra tor

will prompt you to en ter the date of the new cal i bra tion

as fol lows:

Step 22

Using the num ber keys en ter the cur rent date

Note: The fol low ing should be done to zero each type of

pres sure module:

Absolute – Apply ab so lute zero us ing vac u um pump.

Gauge – Vent to at mo sphere

Compound – Vent to at mo sphere

Differential – Vent both ports to atmosphere

Vacuum – Vent to at mo sphere

The cal i bra tor will re spond by dis play ing:

Where xxxxxx is the volt age be ing read from the Quick

Se lect pres sure module and the  ash ing word “work-

ing” in di cates that the cal i bra tor is making the in ter nal

ad just ments nec es sary for the recalibration.

Af ter ap prox i mate ly 3 sec onds the MDI will dis play:

Step 14

To per form full scale cal i bra tion (ad just ment)

To skip full scale ad just ment and pro ceed to re-lin ear -

iza tion pro cess se lect No and press the en ter key.

Important Note:

If full recalibration of the pres sure

module is de sired the zero and span ad just ment must

be re set through these pro ce dures pri or to en ter ing the

lin ear iza tion mode. The zero and span val ues es tab lished

in these pro ce dures will be used for the zero and span

val ues of the new cal i bra tion data. If zero and span are

not re set at this time the recalibration will use the val ues

for zero and span stored in memory from the pre vi ous

zero and span ac tiv i ties.

Step 15

Apply the full scale pres sure for the

Quick Se lect pres sure module be ing cal i brat ed.

sure ment range of the pres sure module be ing cal i brat ed)

with the pres sure ap plied press the en ter key.

The MDI will re spond by dis play ing:

Step 16

Using the key pad en ter the

ex act

val ue of the

pres sure ap plied to the Quick Se lect pres sure mod ule.

Be cer tain to use the en gi neer ing unit in use for the left

Page 69

Revision 4.3 3/2004

For March (03), elev enth (11), 1996

Step 23

With the de sired date en tered and dis played,

press the en ter key.

Step 24

Turn off the MDI and in stall the de-

sired Quick Se lect module.

Step 25

Turn on the MDI to re sume gen er al pres sure

measurement ac tiv i ties.

Step 26

To re-lin ear ize a Quick Se lect pres sure module

Important Note

module is de sired the zero and span ad just ment must

be re set through these pro ce dures pri or to en ter ing the

lin ear iza tion mode. The zero and span val ues es tab lished

in these pro ce dures will be used for the zero and span

val ues of the new cal i bra tion data. If zero and span are

not re set at this time the recalibration will use the val ues

for zero and span stored in memory from the pre vi ous

zero and span ac tiv i ties.

Step 27

With the word “Yes”  ash ing press the

en ter key.

The MDI will re spond by dis play ing:

Step 28

Use the ar row keys to se lect “Pro ceed” to con-

tinue the lin ear iza tion pro cess. Se lect “Cancel” us ing the

ar row keys to dis con tin ue the re-lin ear iza tion pro cess.

Entering “Proceed” will erase lin ear iza tion data in

the EEPROM of the cal i bra tor.

Step 29

To con tin ue the lin ear iza tion pro cess, with the

word “Pro ceed”  ash ing press the en ter key.

The MDI will re spond by dis play ing:

Step 30

Apply the pres sure re quired for point one and

en ter the nu mer i cal val ue, us ing the num ber keys of

the ex act pres sure lev el ap plied. (Use the en gi neer ing

unit in use for the left pres sure module at the time the

cal i bra tion pro cess was start ed). When point 1 has been

ap plied and en tered the dis play will look as fol lows for

cal i bra tion point of 10.002.

Step 31

With the ap plied pres sure dis played

press the en ter key.

The MDI will re spond by dis play ing:

Af ter 3-5 sec onds the MDI will re quest the next cal i -

bra tion point by dis play ing.

Step 32

Apply the pres sure re quired for the next cal i -

bra tion point and en ter the ap plied pres sure val ue with

the num ber keys. For the sec ond point a pres sure of

20.003 has been ap plied.

Step 33

With the re quired pres sure lev el ap-

plied and shown on the dis play press the en ter key.

Step 34

Repeat steps 23-26 as many times as

re quired to pro duce the de sired num ber of lin ear iza tion

points. Points must be in sequence (low to high).

A maximum of 18 lin ear iza tion points plus the zero and

sure modules. Fac to ry cal i bra tion con sists of a 10 point

lin ear iza tion com bined with a 10 point up scale and 10

point down scale lin ear iza tion and hys ter e sis check.

Important Note:

The num ber of cal i bra tion points

need ed to as sure ad e quate cor rec tion for non-lin ear i ty is

as fol lows:

Sensor

Number

Accuracy

of Points

0.025% & 0.05%

including temperature

Page 70

Revision 4.3 3/2004

0.025-0.07%

0.1%

0.25%

Step 35

When the  nal lin ear iza tion point to

be per formed has been com plet ed press the clear en try

key.

The MDI will re spond by dis play ing:

Step 36

To save the new lin ear iza tion data

to mem o ry, there by over writ ing the pre vi ous ly stored

val ues in the EEPROM, se lect “Save” and press en ter.

To dis card the new ly gen er at ed cal i bra tion in for ma tion

Step 37

If “can cel” is se lect ed the cal i bra tor

will exit the cal i bra tion mode. If the en ter key is pressed

with the word “save”  ash ing the cal i bra tor will prompt

en try of the date of the new cal i bra tion as fol lows:

- - - - - -

Step 38

Using the num ber keys en ter the cur rent date

031196

For March (03), elev enth (11), 1996

Step 39

With the de sired date en tered and dis played,

press the en ter key.

Step 40

Turn off the MDI and in stall the de-

sired Quick Se lect module.

Step 41

Turn on the MDI to re sume gen er al pres sure

measurement activities.

Page 71

Revision 4.3 3/2004

APPENDIX A. – PRESSURE CONVERSION FACTORS

CONVERSION FACTORS FOR UNITS OF PRESSURE



Page 72

Revision 4.3 3/2004

00000000

00000001

00000010

00000011

00000100

00000101

00000110

00000111

00001000

00001001

CI)

00001010

00001011

00001100

00001101

00001110

00001111

00010000

00010001

00010010

00010011

00010100

00010101

00010110

00010111

00011000

00011001

00011010

00011011

00011100

FS)

00011101

00011110

00011111

00100000

00100001

00100010

00100011

00100100

00100101

00100110

00100111

00101000

00101001

)

00101010

00101011

00101100

00101101

00101110

00101111

00110000

00110001

00110010

00110011

00110100

00110101

00110110

00110111

APPENDIX B – ASCII CHARACTER CODE

This chart shows the ASCII character set and corresponding code numbers in decimal, hexadecimal and binary form

Hexa-

ASCII

Dec i mal

Binary

decimal

Hexa-

ASCII

Dec i mal

Binary

decimal

00111000

00111001

00111010

00111011

00111100

00111101

00111110

00111111

01000000

01000001

01000010

01000011

01000100

01000101

01000110

01000111

01001000

01001001

01001010

01001011

01001100

01001101

01001110

01001111

01010000

01010001

01010010

01010011

01010100

01010101

01010110

01010111

01011000

01011001

01011010

01011011

01011100

01011101

]

01011110

01011111

01100000

01100001

01100010

01100011

01100100

01100101

01100110

01100111

01101000

01101001

01101010

01101011

01101100

01101101

01101110

01101111

Page 73

Revision 4.3 3/2004

Hexa-

ASCII

Dec i mal

Binary

decimal

Hexa-

ASCII

Dec i mal

Binary

decimal

01110000

01110001

01110010

01110011

01110100

01110101

01110110

01110111

01111000

01111001

01111010

01111011

01111100

01111101

01111110

01111111

Page 74

Revision 4.3 3/2004

200

201

202

203

204

205

206

207

208

209

210

211

213

215

216

217

218

219

220

222

223

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

243

245

246

247

248

249

250

251

252

253

254

255

Hexa-

ASCII

Dec i mal

Binary

decimal

Hexa-

ASCII

Dec i mal

Binary

decimal

Page 75

Revision 4.3 3/2004

PHYSICAL SPECIFICATIONS

6.56 in. x 3.53 in.

Weight

Case Material

Sensor Module Capacity

2 bays for Heise HQS “Quick Select

2 line LCD, 0.037 in. height per line. Can display

simultaneous readings from 2 modules.

Standard banana jacks

32° to 120°F

Storage Temperature

–4° to 158°F

±0.002% of span, 60,000 counts (max)

Warm-Up

5 minutes for rated accuracy

0-50 mA or 0-30 Vdc

ging manually or automatically stores up to 643

or control valves. (Hi-Lo not available with FM

approval.)

Standard:

ac adapter provided for 110Vac/60 Hz

Available:

ac adapter provided for 220Vac/50 Hz

ac adapter provided for 100Vac/60 Hz

approximately 30% reduction in battery life.)

Certi cation

for base display unit and sensor modules

HQS-1

Gauge, differential & compound

Available Ranges

Available Accuracies

±0.06 (0/2-0/200 in. H

Compensated Temperature Range

20°F to 120°F

Temperature Effect

±.004% of Span per °F over compensated range

±0.01% of span (range 0/1 in. H

±0.02% of span (ranges below 0/1 in. H

Sensitivity

±0.002% of span (typical)

Clean, dry, non-conductive, non-corrosive gas

–15 to 50 psi

Standard:

NPT female

British standard

HQS-2

Gauge, absolute, compound and vacuum

Available Ranges

Available Accuracies

±0.025, 0.05 or 0.1 % of Span (±0.025 & 0.05%

Compensated Temperature Range

20°F to 120°F

Temperature Effect

Standard: ±.004% of Span per °F over the com-

over the compensated range

±0.01% of span

Sensitivity

±0.002% of span (typical)

0/5 psi range only: Clean, dry, non-conductive,

0/10-0/10,000 psi ranges: Any medium compat-

200% for ranges up to 1000 psi

Standard:

NPT female

female with  ush port

British standard

British standard with  ush

Welded VCR  tting with standard

 nish

APPENDIX C

Product Speci cations

the ST-2H to measure temperature with an RTD:

and other common 2, 3 or 4 wire probes with

common 2, 3 or 4 wire probes with resistance

outputs of 4000 ohms or less.

Selectable Units of Measure

°C, °F, °K, °R and ohms

Accepts TA4F type RTD connector

TA4F connector. Consult factory for details and

availability.

The HQS-TC1 interface module allows the ST-2H

to measure temperature with a thermocouple:

HQS-TC1

Compatibility

thermocouple.

Automatic internal or manual external

Automatic or manually selectable, up to .01°

Selectable; °C, °F, °K, °R and millivolts

Accepts “miniature thermocouple connector”,

type SMP

220Vac/50 Hz ac Adapter

cation documents from datalogged data

BASE UNIT OPERATING SPECIFICATIONS

TEMPERATURE INTERFACE MODULES

PRESSURE SENSOR MODULE SPECIFICATIONS

ACCESSORIES

Page 76

Revision 4.3 3/2004

0.25*

0.5*

1.0*

2.0*

3.0*

5.0*

10*

15*

25*

50*

100*

150*

200*

psi

in. H

in. Hg

ftSW

kPa

cmH

kg/cm

identi ed above are

accessible through the unit

select feature. However,

primary unit of measure on

start-up. Sensor modules

scaled in primary units

other than in. H

O (HQS-1)

or psi (HQS-2) are also

available.

Consult factory.

±0.125*

±0.25*

±0.5*

±1.0*

±1.5*

±2.5*

±5.0*

±7.5*

±12.5*

±25*

±50*

±75*

±100*

ELECTRICAL SPECIFICATIONS

24 Vdc at 25mA.

Accuracy

0/10 Vdc

±0.025% F.S.

0/30 Vdc

±0.10% F.S.

Accuracy

0/20mA

±0.03% F.S.

0/50mA

±0.05% F.S.

Auto-ranging 10/30 Vdc and 20/50mA

Temperature Effects Electrical Measurement:

±0.001% of span per °F over the compensated

with 9-pin D type at 300,

Calibration module and proper

Standard measurements: 714 records

Stores 10 complete sets of the calibration data in-

cluding 10 “as found” and 10 “as left” data sets.

AC Adaptors:

Provide 9 Vdc output.

Adapts From

831X016-01

831X016-02

831X016-03

230 Vac, 50Hz

Calibration Quick-Select Module:

of base unit electronics.

System Protection Module:

Protects base unit

when only one measurement is required.

Cable Assembly:

Connects base unit to 9-pin

female serial port on computer.

Adapter 9-Pin to 25-Pin:

Serial port connector on

computer.

Provide

-20 UNF internal  ttings. For use

with pumps and general process connections.

NPT external  tting adaptor to convert hose

connector from

-20 to NPT.

0.93

0.97

1.44

3.47

4.00

9.24

0.56

6.74

6.33

3.31

1.51

1.25

1.10

STANDARD RANGES

psi

˝H

Other Engineering Units**

(gauge and

(gauge/

absolute

differential

pressure)

100

150

200

250

300

500

600

1000

1500

2000

2500

3000

5000

6000

7500

10,000

vacuum

compound

±5

±10

±15

–15/+30

–15/+60

INTERFACE AND DATA LOGGING

ACCESSORIES

ST-2H DIMENSION DRAWINGS

Page 77

Revision 4.3 3/2004

System Accuracy (reading in temperature units):

Includes the MDI base unit and GQS-TC1 interface module.

Does not include inaccuracy of the thermocouple device. Consult thermocouple manufacturer or ISA MC96.1 for

thermocouple accuracy speci cations. Typical inaccuracies range from ±1 to ±2.2°C.)

Max. additional error

Accuracy @ 25°C

due to ambient

Thermocouple

Measurement Range

Ambient (Not Including

Ambient (Including

temperature deviation

Type

(°C)

Internal Reference

from 25°C. Expressed

Junction) Expressed as ±°C

as additional C error per

each C deviation from 25°C

–210 to –151

0.7

0.02

–150 to 1200

0.3

0.4

0.01

–240 to –201

2.2

0.05

–200 to –101

0.03

–100 to 999

0.5

0.8

0.02

–250 to –201

2.2

0.05

–200 to –101

0.8

0.03

–100 to 400

0.5

0.8

0.02

–250 to –201

2.0

0.04

–200 to –101

0.6

0.02

–100 to 400

0.3

0.6

0.01

R&S

–50 to 299

3.4

3.6

0.10

300 to 1768

0.04

0.44

200 to 499

5.0

0.16

500 to 999

3.0

0.08

0.04

–250 to –226

4.3

5.7

0.14

–225 to –101

2.1

2.8

0.07

–100 to 1300

0.02

°F = (1.8 x °C) + 32

°K = °C + 273.15

°R = (1.8 x °C) + 427.67

System Accuracy (based on direct millivolt reading from thermocouple – includes MDI base unit and GQS-TC1

interface module. (

Does not include inaccuracy due to the thermocouple device. Reference junction not applicable

to direct millivolt readings.)

Input Range of

Accuracy @ 25°C

Max. additional error due to ambient

temperature deviation from 25°C.

Expressed as additional millivolt error

per each °C deviation from 25°C

–10 to 100 millivolt

0.0125 millivolts

Page 78

Revision 4.3 3/2004

APPENDIX D

Remote Communications Mode

Many of the features of the MDI indicator can be accessed and controlled by a remote terminal, PC or PLC. This

is accomplished by selecting the remote function in the setup menu which is ac cess ed via the front panel of the in di -

ca tor. Press the “setup” key then use the arrow key(s) to scroll through the choices to the RS232 function. With RS232

 ashing press the “ent” key to select. Next select “enable”, choose an appropriate baud rate (based on the terminal or

pc’s serial port con guration) and use the arrow keys to select “re mote”. The last choice is to select an end of message

character which can be CrLf (carriage return/line feed) or “prog” which allows for the entry of an ASCII code for an end

of message character (e.g. 13 for carriage return, etc.). For more in for ma tion regarding the operation of the serial port

Step 1.

Connect cable to MDI Indicator serial port and PC com port. The cable connection should be null modem (i.e

transmit and recieve are  ipped between the two devices).

Step 2.

Power up MDI Indicator by pressing the on/off button.

Step 3.

Con gure the serial port on the MDI indicator as follows:

A. Press “Setup”

B. Cursor to “RS232” <ENT>

C. Cursor to “Enable” <ENT>

D. Cursor to “9600” <ENT>

E. Cursor to “Remote” <ENT>

The MDI indicator’s serial port is now con  g ured for 9600 baud communication.

Step 4.

Con gure the com port in a PC Terminal application.

A. Click on the Settings menu option and pull down to select Com mu ni ca tions

B. Click on 9600 Baud, 8 Data Bits, 1 Stop Bit, Parity None, Flow Control None, select the appropriate

Com Port, and click OK. The Terminal application is now con gured to communicate with the MDI

Indicator in the Remote Mode.

Step 5. Verify Communication between MDI Indicator and PC

Type a question mark character and press enter on the terminal keyboard. The Indicator should respond

with a display of pressure readings from both sensors similar to the following:

If there is no response, verify the cable connections, cable type (modem vs.. thru), the Com Port settings

then repeat steps 1 through 5 above.

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Revision 4.3 3/2004

Step 6. Communication link is es tab lished

After communications have been sucessfully established you are ready to use the commands listed in the following com-

mand library to “talk to” and modify the behavior of the MDI in di ca tor.

The MDI indicator ex pects a CR (carriage return) character as the ter mi na tor on the com mand string. In the following

examples the underscore character ( _ ) represents a single space. Com mas must be included where indicated. The com-

mand can be transmitted in upper case or lower case.

Following is a list of commands and a description of their function. Com mands can be sent from a terminal or PC using a

terminal package or im bed ded in custom soft ware which includes a command. A com mand fol lowed by a question mark

character will return the status of the feature (on/off or value where ap pli ca ble). The status of the feature can be changed

by sending the command and an ap pro pri ate value as summarized in the following table.

Note:

Commands must be ter-

minated with a carriage return.

Note:

The underscore char ac ter ( _ ) in the following table represents a single space.

Function

Returns the cur rent displayed value(s)

BATCK?

Returns the battery charge status

DAMP?

Returns the status of the damping function

DAMP_0

Turns damping off

DAMP_1

Sets damping to level 1

DAMP_2

Sets damping to level 2

DAMP_3

Sets damping to level 3

EUNIT?

Returns a code representing the current engineering unit(s)

EUNIT_1

Sets left display to PSI

EUNIT_2

Sets left display to inHG

EUNIT_3

Sets left display to inH2O

EUNIT_4

Sets left display to FtSeawater

EUNIT_5

Sets left display to Bar

EUNIT_6

Sets left display to mBar

EUNIT_7

Sets left display to Kpa

EUNIT_8

Sets left display to MPA

EUNIT_9

Sets left display to mmHg

EUNIT_10

Sets left display to cm Water

EUNIT_11

Sets left display to mm Water

EUNIT_12

Sets left display to kg/cm2

EUNIT_13

Sets left display to User De ned Engineering Unit (see

engineering unit feature in manual)

Note:

Each displayed value can be set to a unique engineering unit by in clud ing

both in the command line as in the following example: EUNIT_2,_11. This will

Response

EUNIT_15

Degrees C

EUNIT_16

Degrees F

EUNIT_17

Degrees K

EUNIT_18

Degrees R

EUNIT_19

Ohms

Page 80

Revision 4.3 3/2004

Note:

EUNIT_15 through EUNIT_19 commands apply only when a temperature module

is in stalled in one of the MDI ports

HOLD?

Returns the status of the display hold feature

HOLD_1

Activates hold

HOLD_0

Deactivates hold

KEYLOCK?

Returns the status of the keylock feature

KEYLOCK_1

Activates (locks out) front panel access

KEYLOCK_2

Deactivates front panel keylock

LAMDIERR?

Returns the value of the last error code

MINMAX?

Returns the min and max values for each installed module

PORT?

Returns a value representing the current port con guration

PORT_0

Set left display to pressure right display to Ma

PORT_1

Set left display to Ma and right display to pressure

PORT_2

Set left and right displays to pressure

PORT_3

Set left display to left minus right differential display

PORT_4

Set right display to left minus right differential display

PORT_5

Set left display to left plus right

PORT_6

Set right display to left plus right

TARE?

Returns status of tare function

TARE_1,_0

Activate tare on left display only

TARE_0,_1

Activate tare on right display only

TARE_1,_1

Activate tare on both displays

TARE_0,_0

Deactivate Tare on both displays

ZERO

Zeros installed sensors

ZERO_0,_1

Zero left display only

ZERO_0,_1

Zero right display only

ZERO_1,_1

Zero both ports

Page 81

Revision 4.3 3/2004

APPENDIX E

SWITCHCRAFT TINI QG (TA4F)

3 WIRE RTD

TA4F

4W+

2W–

Page 82

Revision 4.3 3/2004

APPENDIX F

THEORY

With the TC1 module installed in the base unit (set-up to display in mV), a precision millivolt calibrator/supply will

apply a known mV signal to the module/base unit system (simulating the Seebeck voltage) in place of a thermocouple.

The applied mV signal can then be read on the base unit display and compared to the nominal input provided by the

precision millivolt calibrator/supply. The TC1 module cannot be adjusted. If the module will not meet the speci ed ac-

curacy, contact the factory or instrument supplier.

1. Remove all existing modules from the base unit (handheld calibrator  rmware rev. 3.01 or later, digital indicator

 rmware 2.00 or later) and install the TC1 in the either module bay.

2. Attach copper wire to the + and - terminal posts of a precision millivolt calibrator/source, rated at .0025% or better.

3. Wire the opposite end of the wires to a miniature “U” type (copper-copper) thermocouple connector, and plug the

connector into the receptacle located in the top of the TC1 module.

4. Turn on the millivolt calibrator/source and adjust until it is supplying 0mV to the TC1 module.

5. Turn on the base unit by pressing the on-off switch. Allow the base unit to complete its startup routine.

6. Press the “Setup” button.

7. Using the arrow key, toggle once to the right and down 7 times until “TCmodule” is  ashing.

8. Press enter.

9. Set engineering unit to “millivolt” by pushing the right arrow button until “mV” is  ashing.

unit.

Page 83

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of

13 months from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace

period to the normal

one (1) year product warranty to cover handling and shipping time. This

ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service

Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components which wear are not warranted, including but not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR

WARRANTY RETURNS, please have the

following information available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems

relative to the product.

FOR NON-WARRANTY REPAIRS,

consult OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST

of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.

Revision 4.2 5/1/2000

Page 84

Revision 4.2 5/1/2000 M3330/0499

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

TEMPERATURE



Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies



Wire: Thermocouple, RTD & Thermistor



Calibrators & Ice Point References



Recorders, Controllers & Process Monitors



Infrared Pyrometers

PRESSURE, STRAIN AND FORCE



Transducers & Strain Gages



Load Cells & Pressure Gages



Displacement Transducers



Instrumentation & Accessories

FLOW/LEVEL



Rotameters, Gas Mass Flowmeters & Flow Computers



Air Velocity Indicators



Turbine/Paddlewheel Systems



Totalizers & Batch Controllers

pH/CONDUCTIVITY



pH Electrodes, Testers & Accessories



Benchtop/Laboratory Meters



Controllers, Calibrators, Simulators & Pumps



Industrial pH & Conductivity Equipment

DATA ACQUISITION



Data Acquisition & Engineering Software



Communications-Based Acquisition Systems



Plug-in Cards for Apple, IBM & Compatibles



Datalogging Systems



Recorders, Printers & Plotters

HEATERS



Heating Cable



Cartridge & Strip Heaters



Immersion & Band Heaters



Flexible Heaters



Laboratory Heaters

ENVIRONMENTAL MONITORING AND CONTROL



Metering & Control Instrumentation



Refractometers



Pumps & Tubing



Air, Soil & Water Monitors



Industrial Water & Wastewater Treatment



pH, Conductivity & Dissolved Oxygen Instruments