Ashcroft PT-1 Operating Manual

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TABLE OF CONTENTS

Section Description Page

SAFETY PRECAUTIONS

....................................................................................

1.0 General Product Overview

................................................................................

....................................................................

1.2 Optional Product Features

...........................................................................

2.0 Theory of Operation

..........................................................................................

Theory of Operation – Base (Display) Unit

.................................................

2.2

Theory of Operation – Low Pressure Sensor Assemblies

2.3

Theory of Operation – Medium and High Pressure

2.4

Temperature Measurement with Standard RTD Probes

...............................

3.0 Unpacking

...........................................................................................................

4.0 System Start-Up

5.0 Shift Functions (Shift Key)

................................................................................

6.0 The Enter Function (ENT Key)

7.0 The Port Select Function (PORT Key)

7.1

.....

8.0 Zeroing the Instrument

Zeroing All Installed Pressure Sensor Assemblies On Power UP

...............

8.2

Zeroing All Installed Pressure Sensor Assemblies In Normal Operation

....

8.3

Zeroing Either of Two Installed Pressure Sensor Assemblies

......................

9.0 Selecting Engineering Units

Changing the Engineering Unit On Indicators with One Installed

Pressure Sensor............................................................................................. 12

9.2

Simultaneously Changing the Engineering Unit for Two

Installed Pressure Sensor Assemblies........................................................... 12

9.3

Assemblies.................................................................................................... 13

10.0 The Tare Function

Using the Tare Function On An Indicator with a Single Installed

Pressure Sensor............................................................................................. 14

10.2

Using the Tare Function to Simultaneously Tare Two

Installed Pressure Sensors............................................................................ 14

10.3

Taring Either of Two Installed Pressure Sensor Assemblies

........................

11.0 Damping Function

..............................................................................................

.............................

12.0 Max/Min Tracking Function (Max. & Min. Pressure Measurement Tracking)

Recalling and Maintaining Stored Max/Min Values

....................................

12.2

Recalling Stored Max/Min Values and Erasing After Review

.....................

13.0 RS232 Output Function

RS 232 Connector

........................................................................................

13.1.1

.............................................................

13.1.2

The Remote Protocol

................................................................................

13.1.3

The Print Protocol

.....................................................................................

13.2

.....................................................................

13.3

.........................................................................

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Section Description Page

14.0 The Back Light Function (Optional)

.................................................................

14.1

Timed Back Light Function

.........................................................................

14.2

.................................................................

15.0 Battery Check Function

15.1

Using Battery Check Function

.....................................................................

15.2

Low Battery Indicator

..................................................................................

16.0 The Hold Function

..............................................................................................

16.1 Using The Hold Function

....................................................................................

17.0 The Print Function

.............................................................................................

17.1

Using The Print Key

.....................................................................................

18.0 Temperature Measurement Using RTD probes

18.1 Setting Up the System for Temperature Measurement

...............................

18.2 Calibrating/Programming the RTD Interface Assemblies

...........................

19.0 Calibrating the Indicator

19.1 Adjusting Calibration Zero and Span Settings

............................................

19.2 Performing A Complete Recalibration

........................................................

19.2.1 Terminal Requirements for Performing A Complete Recalibration

.......

19.2.2 Performing A Recalibration/ Relinearization of the Indicator

................

19.2.3 Remote Zero Adjustment

........................................................................

19.2.4 Remote Full Scale Adjustment

...............................................................

19.2.5 Remote Adjustment of Linearization Values

..........................................

20.0 Installing a Second Pressure or Changing Sensor Assembly

20.1 Procedure for Installing or Changing a Pressure Sensor Assembly

................

21.0 Replacement of Optional Cadmium Batteries

.................................................

21.1 Procedure for Installing Replacement Nickel Cadmium Batteries

..................

A-1.0 Introduction – Remote Communication Protocol

...............................................

A-2.0 Notation Conventions

A-3.0 Numeric Format

.....................................................................................................

A-4.0 Command Reference

A-5.0 Command Library Summary

Appendix A Indicator Serial Port Functions Version 1.0

..............................................

Appendix B End of Message Characters

Appendix C Product Speciﬁ cations

...............................................................................

Appendix D Remote Communications Protocol Errata Sheet

Appendix E. RTD Probe Connector

................................................................................

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SAFETY PRECAUTIONS

A few general guidelines for the selection of pressure

measurement instrumentation follow:

– Select a range so that the maximum applied

pressure will never exceed the upper range limit.

Vibration

– Excessive vibration could cause loosening

– Excessive pressure pulsation could result in

fatigue failure of the pressure element.

Temperature

– Operation of the instrument in an envi-

ronment where temperatures are in excess of design

ratings may result in loss of accuracy and failure.

– Some of the sensor types available for the

indicator are designed for use on clean dry air. Use

liquids, wet gases or corrosive gases will reduce system

– Only approved explosion proof

Instruments should

not be used in locations where EMI/RFI conditions may

Electronic pressure instruments must be selected in

ASME B40.100, that apply to elastic pressure elements

ASME B40.100 is available from:

ASME

New York, NY 10017

provides a wide array of pressure measurement and test

nish individuals responsible for pressure measurement

the requirements of both ﬁ eld and lab type applications.

This digital indicator incorporates the latest in pressure

measurement technology. Each instrument is comprised

installed pressure measurement assemblies.

The base display electronics provide:

1) The user interface, via a combination of a liquid

2) Interface connections for two pressure measurement

types and ranges available.

3) Digital interface capability via the full function RS232

interface.

Pressure sensor assemblies are available in two basic conﬁ gu-

rations. These include:

1) Specialized low pressure sensing units based on micro-

machined variable capacitance sensors. These sensor

water through 200 inches of water in gauge, differential

2) Piezo resistive strain gauge based sensor assemblies cov-

The instruments are powered via an AC adapter provided

which each unit. An optional built-in nickel cadmium

rechargeable power pack is available for application in which

AC power is not available.

The instruments are housed in a custom manufactured, injec-

tion molded case. The case is constructed of high impact ABS

plastic. This material is non-conductive and is resistant to

both chipping and cracking. Panel and bench mount conﬁ gu-

rations are available.

Each

Indicator is a fully equipped pressure measurement

instrument. Standard product features include the ability to:

ment display.

Zero:

Zero displayed pressure measurement value(s) at the

push of a button.

programmed engineering units. Dual sensor units can simul-

taneously display both measurement values in independent

Activate any of 3 factory pro-

Tare

Tare the displayed measurement for either one of two

installed sensors or both sensors simultaneously.

Display minimum and maxi-

mum pressure value(s) at the push of a button.

RS232 interface can be conﬁ gured for

transmission of measurement data as well as set up the instru-

ment conﬁ guration over the RS232 interface.

SECTION 1.0 GENERAL PRODUCT OVERVIEW

1.1 Product Capabilities Overview

Page 6

Freeze the measurement values on the dis-

play at the push of a button.

Print the pressure measurement value(s) at

the push of a key over the standard RS232 interface.

Additional capabilities for instruments equipped with the

Display the measured values

Dis-

play measurement data from two sensors in the same or

pressure by automatically subtracting the measurement

value of one sensor from the other.

Two Sensor Addition

two installed sensors. Allows unit with single absolute

pressure sensor assembly to provide measurement data for

both sensors in terms of absolute pressure.

1.2 Optional Product Features

As previously outlined, the pressure indicator is a fully

product features are available to enhance the capabilities of

the unit. These are:

bly can be speciﬁ ed as an option. Any combination of

play can be provided with back-lighting to enhance

readability in low light and high glare areas.

without use of the back lighting option or for up to 5

hours with continuous use of back lighting.

The indicator incorporates the latest in electronic, micro-

processor and sensor technologies. This combination pro-

The instrument includes one or, optionally, two calibrated

ics. All pressure measurement calibration data is stored in

EEPROM (Electrically Erasable Programmable Read Only

Memory) located within the pressure sensor assembly. The

pressure sensor assembly produces an output from 0-1 Vdc

for pressure inputs from the minimum to the maximum

measurement rating of the pressure sensor assembly. The

front end electronics of the main unit “read” the voltage

the EEPROM in the sensor assembly for the correction fac-

tors required to convert the voltage measurement into the

tors in the EEPROM correct for non-linearity and thermal

In addition, the main unit provides the application oriented

user interface to simplify the use of indicator. All higher

level functions, such as: unit select, tare, max/min recall,

push to print and so forth are provided for by the capabili-

ties of the microprocessor in the main unit.

The inches of water pressure measurement assemblies pro-

vide specialized low pressure measurement capabilities.

These pressure measurement assemblies incorporate a

micro-machined silicon variable capacitance sensor. Inside

the sensor there is a micro-machined silicon diaphragm.

This diaphragm is between two non-moving plates on

which metal has been sputtered. The air between the dia-

phragm and the non-moving plates acts as an insulator.

As pressure or vacuum is applied to the sensor, the dia-

phragm moves changing the distance between the dia-

phragm and the ﬁ xed plates. This change in distance

vacuum during the calibration process.

The sensor is connected to an Application Speciﬁ c Inte-

ramp and applies this signal to the top plate of the sensor

while a signal of equal intensity but with opposite polarity

is applied to the bottom plate.

When the measured pressure is balanced, for example

when both ports are opened to atmosphere, the distance

between the diaphragm and both of the ﬁ xed plates is

the same. When this is case, the signal to the top plate

is capacitively coupled to the equal and opposite signal

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

pressure or vacuum, the excess current ﬂ ows through the

into a voltage which is scaled over the full scale range of

the sensor assembly.

Low pressure sensing assemblies incorporating the micro-

machined silicon variable capacitance sensor are available

in ranges from 0.25 inches of water through 200 inches

2.2 Theory of Operation – Low Pressure Sensor Assemblies (Inches of Water Column)

SECTION 2.0 THEORY OF OPERATION

2.1 Theory of Operation – Base (Display) Unit

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The RT2 assembly is supplied factory programmed to

RT assemblies can be programmed with coefﬁ cients for

programmed into the RT assembly to provide enhanced

ferent programmed RTD calibration curves. Programming

package ( part number 838X014-01 for the 3 1/2 inch disk

Prior to removing the indicator from the packaging mate-

rial inspect all cartons for shipping damage. Document

must be made against the shipper. After inspection, remove

the instrument, AC adapter, manual and any accessories

purchased from the packaging material. Retain the packag-

ing for use in returning the indicator to the factory for

future recalibration or repair.

Locate, unpack and untie the AC adapter.

Looking at the back of the indicator, locate the AC

back of the instrument) of the rear panel.

Plug the AC adapter jack into the back of the

indicator.

Plug the transformer into an outlet providing the

provided on the label of the AC adapter.

Press the Power key on the far left side of the row

the following start up screens as it performs the initial start

up self tests.

Mfg Date xx/xx/xx

range range

where:

xxxxx = the full scale range of the sensor assembly

installed in the corresponding side of the

indicator

the available low pressure sensor assemblies is provided in

Appendix C- Product Speciﬁ cations.

2.3 Theory of Operation-Medium and High Pressure

The PSI pressure measurement assemblies incorporate a

piezoresistive strain gauge sensor. This technology takes

the ﬂ 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

fashion, the output will be near zero when no pressure

with the application of pressure or vacuum. The reverse

When power is applied to the sensor the level of resistance

to the level of pressure or vacuum applied. The output

from the sensor is extremely repeatable and has minimal

hysteresis due to the fact that the sensor substrate is silicon.

The sensor output is then ampliﬁ ed by circuitry within the

pressure sensor assembly to a level of 0-1 Vdc for the full

mable Read Only Memory) within the pressure sensor

Pressure sensor assemblies for PSI measurement ranges

These pressure sensor assemblies can be conﬁ gured to

provide the capability to measure gauge, absolute and com-

pound pressures as well as vacuum. PSI sensor assemblies

in ranges up to 300 psi are designed for use on clean,

0/10 through 0/300 psi. Ranges from 500 psi through

The RTD interface assembly allows the base unit, when

used with RTD temperature probes, to provide precision

temperature measurement data. The interface assembly is

into the Switchcraft TA4F connector on the module. The

RT1 assembly comes factory programmed with the curves

for Pt 100 (385 & 392), Cu 10 and Ni 120 RTD probes. It

(Single Port Sensor Assemblies)

SECTION 3.0 UNPACKING

SECTION 4.0 SYSTEM START-UP

2.4 Temperature Measurement with Standard RTD Probes

Page 8

EU = the primary or default engineering unit for

the sensor assembly installed in the cor-

responding side of the indicator.

ing unit data will appear centered on the display during

normal instrument pressure measurement operations.

If your instrument is equipped with the optional

rechargeable nickel cadmium batteries the battery pack

was charged prior to shipment. While in storage, nickel

mended that the nickel cadmium batteries be recharged

prior to use of the indicator. When the indicator is

ies will automatically recharge. While connected to line

power, the batteries will be recharged whether the instru-

ment is in use or not. Battery recharge time is 12-14

hours from a completely discharged state to a fully charged

indeﬁ nitely without damaging the batteries.

SECTION 5.0 SHIFT FUNCTIONS (Shift Key)

There are two classes of functions accessible through the

front panel of the indicator. These are primary functions

providing access to two capabilities. Secondary functions

the key that will activate the desired secondary function.

In all cases, the primary function of a key is the function

performed when the key is pressed without ﬁ rst pressing

the shift key. Single function keys and the primary position

required digital indicator functions. Functions are accessed

by pressing the key or combination of keys indicated below.

The shift key need only be pressed once during a given

required, to highlight the desired set up conﬁ guration. The

indicator will stay in the shift mode until the desired selec-

tion is made through the use of the enter key.

Power Turn unit on POWER

Zero Zero sensor(s) ZERO

functions

Unit Select engineering UNIT/PORT

unit(s)

Port Select Select port SHIFT then

Tare Tare pressure TARE/DAMP

preload

Damp Set Level of SHIFT then

Damping TARE/DAMP

Max/Min Recall Max/Min MAX/MIN

values OUTPUT

Backlight Lighting LITE

Display display

Battery Checking battery SHIFT then

Enter accepting set ENT

up option high-

lighted on display

Freezing Locking measured HOLD

Display values on display

Push To Print Printing measured PRINT

values on demand

protocol and the indicator must be conﬁ gured in the

measurement data for the push to print function to oper-

included in Section 13.3 Set Up for Print Protocol.

There are various set up functions which require a selec-

tion from a menu of available performance parameters.

These set up functions include selection of the desired:

Engineering Unit(s)

Port or Display Conﬁ guration

Level of Damping

The ENT key is used to select the highlighted conﬁ gura-

tion or operating parameter. Proper use of the ENT key is

included, as required, in each of the following sections.

As an optional feature the indicator can be equipped with

two pressure sensor assemblies.

SECTION 6.0 THE ENTER FUNCTION (ENT Key)

SECTION 7.0 THE PORT SELECT FUNCTION (PORT Key)

Page 9

In units with the dual installed sensor option the UNIT/

PORT key allows the operator to conﬁ gure the instrument

both sensors. For use of the PORT function in indicators

with two installed sensors proceed to Section 7.1 Setting

Instrument Conﬁ guration with the Port key.

The standard indicator is supplied with a single pressure

pressed followed by pressing the PORT key the indicator

will display:

module required

After displaying the above message the indicator will auto-

matically resume pressure measurement.

7.1 Setting Instrument Conﬁ guration with the

This section only applies to indicators equipped with the

Press the SHIFT key one time. After pressing

the shift key an upward pointing arrow will appear on the

Press the PORT key. If the indicator has the

the PORT key will result in the following message display:

L-R R-L L+R

The current conﬁ guration will be the default con-

Press the PORT key the number of times required

to activate the desired measurement display conﬁ guration.

The SHIFT key should not be pressed after the port selec-

tion menu has been activated. Each time the PORT key is

pressed the next port conﬁ guration will be highlighted on

the display and will ﬂ ash.

Left: activates the left sensor and side of the indicator

Right: activates the right sensor and side of the indicator

Both: activates both sensors and both sides of the dis-

play.

L-R:

produces display of the differential of the left

minus the right measured values.

R-L: produces display of the differential of the right

minus the left measured values.

R+L produces the display of the sum of the measure-

ments of the two installed sensors.

With the desired display conﬁ guration ﬂ ashing

press the enter key (ENT). After pressing the enter key the

indicator will begin displaying the measurement values in

the desired conﬁ guration.

The left side of the display presents the pressure

measurement data generated from the pressure sensor

from the sensor assembly installed in the right side of the

indicator.

Upon instrument start up it is possible that gauge, compound,

may display a slight zero offset. In most cases this offset

will diminish or even disappear as the instrument warms

up.

zeroed prior to use or calibration.

Upon power up, abso-

lute pressure sensors will display measured values repre-

pressure sensor assemblies can be accomplished by adher-

ing to the methods detailed in the subsequent sections.

must be vented to atmosphere prior to initiating the zero

process. Be certain any pressure connections to the sensor

to be zeroed are vented to atmosphere prior to zeroing the

pressure sensor assembly.

Absolute sensors must be connected to an evacuated refer-

blies. A vacuum pump and a vacuum gauge are required to

the following error message will appear.

too much

This protects from accidental zeroing of absolute pressure

is appropriately vented to atmosphere (for gauge, vacuum,

have been damaged due to exposure to improper media

brated, if possible, or returned to the factory for evaluation

The zero procedures for the different display conﬁ gura-

Port Select Key

(PORT Key)

SECTION 8.0 ZEROING THE INSTRUMENT

Page 10

tions of the indicator appear in the sections as shown

below. In order for these procedures to provide the desired

results the operator must have already set up the instru-

ment sensor assemblies to be zeroed in accordance with

the instructions outlined in the appropriate subsection of

8.1 For zeroing any installed sensors on power

up.

8.2 Zeroing any installed sensor assemblies in

normal operation.

8.3 Zeroing either one of two installed sensors

in indicator.

zero the indicator.

values from both of the installed assemblies are dis-

8.1 Zeroing All Installed Pressure Sensor

When initially turned on the indicator will commence mea-

blies. The sensor assembly is installed in the left side of

the instrument if one sensor assembly is ordered. As such,

pressure measurement data, the display will look as follows.

PSI

If the indicator was purchased with the optional second

pressure sensor assembly the display, on power up, will

look as follows.

+12345 +12345

The indicator will always commence pressure mea-

pressure measurement assembly. Default engineering units

pressure port) and inches of water column for low pressure

To zero all installed pressure sensor assemblies

press the ZERO key and hold for 2 seconds after the

initial start-up sequence is completed. As shown below,

the indicator will respond by zeroing out any displayed

pressure measurement.

00000 00000

This section only applies to indicators equipped with the

As outlined in Section 8.0, the measured values of a

two installed sensors has been de-activated the deactivated

for the zero procedure to work for that sensor.

The following procedure details the method used to restore

both installed sensor assemblies to the display for zeroing.

Press the SHIFT key one time. After pressing the

Press the PORT key. If the indica-tor has the

the PORT key will result in the following message display.

Left Right Both

The current conﬁ guration will be the default con-

the indicator is only displaying the measurement data from

the pressure sensor assembly installed in the left side of

the indicator.

Press the PORT key the number of times required

to highlight the word ‘‘both’’ in the conﬁ guration menu. In

this example the PORT key would be pressed two times.

The word both will ﬂ ash when highlighted. Each time the

PORT key is pressed the next display conﬁ guration will be

highlighted on the display and will ﬂ ash.

L-R R-L L+R

With the word both ﬂ ashing on the display press

the enter key (ENT).After pressing the enter key the indicator

will begin displaying the measurement for both installed

PSI PSI

To zero both installed pressure sensor assemblies,

press the ZERO key and hold for 2 seconds while the

measured outputs from both sensors are shown on the

installed sensors shown on the display will simultaneously

Assemblies On Power UP

8.2 Zeroing All Installed Pressure Sensor Assemblies In Normal Operation

Page 11

0.0000 0.0000

After the zero procedure has been completed the indicator

will automatically resume pressure measurement activities.

8.3 Zeroing Either of Two Installed Pressure

The following section applies only to indicators equipped

with the optional second pressure sensor assembly.

The zero function will only zero the measurement values

that are shown on the display. If the objective is to zero one

measured values for the sensor assembly not being zeroed.

The following steps detail the methodology for zeroing one

Determine which sensor assembly is to be zeroed.

The measured value from a sensor assembly always

installed.

Press the Shift key to allow access to the port

indicator will respond by adding an upward pointing arrow

to the display as follows.

^ PSI PSI

Press the PORT key to activate the port select

function. Pressing the PORT key will result in the follow-

ing conﬁ guration options being displayed on the indicator.

Left Right Both

values from both installed pressure sensor assem-blies the

word “both” will ﬂ ash on the display.

With the port select conﬁ guration options dis-

played, press the port key the number of times required to

leave only the measured output for the sensor assembly to

be zeroed visible on the display. For example, if the left

not to be zeroed press the PORT key four (4) times, the

number of times necessary to highlight the word left from a

L-R R-L L+R

With the appropriate selection high-lighted and

The indicator will respond by changing the display so that

the indicator is displayed.

+12345 --------

With the measurement data for the pressure

for 2 seconds.

The indicator will respond by zeroing the displayed pres-

PSI--------

To return the measurement values for the sensor

installed in the right side of the instrument case to the

by adding the upward pointing arrow to the display as

follows.

^ PSI ---------

With the shift function active, as shown by the

L-R R-L L+R

Press the PORT key the number of times required

to highlight the word “both”. When highlighted the word

Left Right Both

With the word “both” ﬂ ashing press the enter

key (ENT). The indicator will respond by displaying the

measured values from both installed sensor assemblies.

The measured value from the left sensor will be zeroed

the previous zero offset.

PSI PSI

The digital pressure indicator provides the ability to chose

with the zero function, the engineering unit selection func-

tion will only effect the measured values shown on the

blies as well as for the selection of different engineering

units for each installed pressure sensor assembly.

Sensor Assemblies

SECTION 9.0 SELECTING ENGINEERING UNITS

Page 12

9.1 Changing the Engineering Unit On Indicators

The following procedure should be followed for changing

the engineering unit of measure in indicators that have one

installed pressure sensor assembly.

With the indicator on and displaying pressure

measurement data press the key labeled PORT/UNIT.

The indicator will respond by displaying the factory pro-

Bar mBar kPa mPa

the second screen accessed after scrolling through the ﬁ rst

mmHg cmWC mmWC kgcm

where:

Unit Description

psi pounds per square inch

˝ Hg inches of mercury (@ 0

˝ W Cinches of water (@ 20

ftSW feet of seawater Bar Bar

mBar millibar

kPa kilopascals

mPa megapascal

mmHg millimeters of mercury (@ 0

mmWC centimeters of Water (@ 20

The engineering unit library is automatically presented

with the current engineering unit highlighted (ﬂ ashing) on

the display of the indicator. In this example the engineering

unit currently in use is psi.

To select the desired engineering unit, repeatedly

press the UNIT key to scroll through the on-board engi-

neering unit library. In this example, we will change from

psi to inches of water by pressing the unit key three times

to highlight the text “˝ WC”.

Bar mBar kPa mPa

2nd screen

mmHg cmWC mmWC kgcm

With the text ˝ WC ﬂ ashing press the enter key.

The indicator will respond by resuming the function of

pressure measurement in the selected engineering unit.

+12345

This section applies only to indicators equipped with the

If the measured values from both installed pressure sensor

If either of the installed sensor assemblies has been deacti-

vated (removed from the display via the port select func-

tion) it must be restored prior to initiating the change

restore both measured values to the display and simultane-

With the indicator on and displaying pressure

measurement data, press the SHIFT key to activate the

indicator will respond by adding an upward pointing arrow

to the data currently seen on the display.

+xxxxxx

With the upward pointing arrow visible on the

the port select function. Pressing the Port key will result

in the following conﬁ guration options being displayed on

the indicator.

L-R R-L L+R

The current conﬁ guration in use will automatically ﬂ ash

when the port select menu is activated. In this example, the

measurement values from the left pressure sensor are being

PORT key the required number of times to highlight the

word both from the list of port select options.

For this example the PORT key would be pressed two

times to highlight the word “both”.

Left Right Both

With the word "both" highlighted and ﬂ ashing

press the enter key (ENT). The indicator will respond by

rently in use. In this case, the measurement values from

both of the installed pressure sensor assemblies are being

+12345 +12345

with One Installed Pressure Sensor

9.2 Simultaneously Changing the Engineering Unit for Two Installed Pressure Sensor Assemblies.

Page 13

To change the engineering unit for both the dis-

played values press the key designated UNIT with both

measured outputs shown on the display. The indicator will

respond by displaying the factory programmed engineering

unit library as follows.

Bar mBar kPa mPa

2nd screen

mmHg cmWC mmWC kgcm

where:

Unit Description

psi pounds per square inch

˝ Hg inches of mercury (@ 0

˝ WC inches of water (@ 20

ftSW feet of seawaterBarBar

mBar millibar

kPa kilopascals

mPa megapascal

mmHg millimeters of mercury (@ 0

mmWC centimeters of Water (@ 20

The unit currently in use will ﬂ ash on the display. In this

With the engineering unit library activated select

the desired unit of measure by pressing the UNIT key the

number of times necessary to highlight the engineering

unit of choice. When highlighted the unit of measure will

the list will be highlighted.

For the example here we will select ˝ Hg as the engineering

unit of choice. The UNIT key would be pressed one time to

Bar mBar kPa mPa

2nd screen

mmHg cmWC mmWC kgcm

With the desired engineering unit highlighted, ˝

Hg in this example, and ﬂ ashing, press the enter (ENT)

key. As shown, the indicator will respond by altering the

+12345 +12345

9.3 Changing the Engineering Unit for Either of

This section only applies to indicators equipped with the

With the indicator on and displaying pressure

measurement data, determine which sensor assembly is to

be changed to the new unit of measure.

The measured value from a sensor always appears on

the side of the display that corresponds to the side of the

instrument in which the sensor assembly is installed.

Press the SHIFT key to activate the shift function

respond by adding an upward pointing arrow to the data

+xxxxxx +xxxxxx

Press the PORT key to activate the port select

function. Pressing the PORT key will result in the follow-

ing conﬁ guration options being displayed on the indicator.

L-R R-L L+R

In this example, since the measurement values from both

pressure sensor assemblies are actively being shown on the

port select menu is activated.

With the port select function activated, press the

PORT key the required number of times to deactivate (re-

move from the display) the measured output from the sensor

For example, if the left side of the display is to be changed

from psi to kPa and the right side is to remain in psi the

PORT key would be pressed three times (the number of

times necessary to change the highlighted word from the

word “both” to the word left from the list of port select

Left Right Both

L-R R-L L+R

With the appropriate selection highlighted and

The indicator will respond by displaying following.

psi -----

With the side of the display to be changed to the

new engineering unit active (shown on the display) and the

UNIT key. The indicator will respond by displaying

Two Installed Sensor Assemblies

Page 14

Bar mBar kPa mPa

2nd screen

mmHg cmWC mmWC kgcm

With the engineering unit library on the display

to be selected is highlighted.In this case pressing the UNIT

key 4 times will change the highlighted engineering unit

from psi to Bar.

Bar mBar kPa mPa

2nd screen

mmHg cmWC mmWC kgcm

With the desired engineering unit high-lighted

indicator will respond by converting the pressure displayed

+12345 -----

To restore the right side of the display to the

The indicator will respond by adding an upward pointing

^ Bar-----

Press the PORT key. The indicator will respond

by displaying.

Left Right Both

lighted and ﬂ ashing when the port conﬁ guration menu is

Press the PORT key the number of times required

to activate the desired display conﬁ guration (2 times in this

Left Right Both

With the desired conﬁ guration displayed press the

the following.

Bar psi

Using the engineering unit and the port select functions

in tandem any combination of available units and display

location can be arranged.

SECTION 10.0 THE TARE FUNCTION

Use of the tare function allows the indicator to be set up to

is often used for applications such as:

platform or container is to be subtracted from the measure-

ment

used for short term gauge pressure measurement activities.

As with the zero function, the tare function will only effect

the measured values shown on the display. To tare out a

pressure preload the pressure sensor measuring the preload

must be active (shown on the display). This allows for

well as for the taring of either one of two installed pressure

The full scale range of a sensor is not

For example, if a 100 psi sensor is tared with a pressure

preload of 15 psi the remaining usable measurement span

is 85 psi. With 15 psi tared out on a 100 psi sensor the

measured values will exceed the rated range of the sensor

when the measured pressure exceeds 110% of the sensor

measured value exceeds 95 psi (85 psi + 10% of the 100

psi range of the sensor which is 10 psi).

With the indicator on and displaying pressure

measurement data press the key labeled DAMP/TARE. The

indicator will respond by adding a small T to the display

to indicate that the instrument is in the tare mode. When

initially placed in the tare mode, the display of the indica-

tor will show a "zero" pressure measurement until the

measured value changes from the measurement value at the

time the tare function was activated.

+000000

To exit the tare mode press the TARE key again.

The indicator will resume the function of basic pressure

measurement (untared).

This section only applies to instruments with the optional

If the measured values from both installed pressure sensor

10.1 Using the Tare Function On An Indicator with a Single Installed Pressure Sensor

10.2 Using the Tare Function to Simultaneously Tare Two Installed Pressure Sensors

Page 15

TARE key one time will simultaneously tare both sides of

the pressure display.

If either of the installed sensor assemblies have been deac-

tivated (removed from the display via the port select func-

tion) it must be restored prior to initiating the tare function.

Follow the steps below to restore both measured values to

the display and simultaneously tare both sensor assemblies.

If both pressure sensor assemblies are active (measurement

values are visible on the display) skip to step 5 of this

procedure.

With the indicator on and displaying pressure

measurement data press the SHIFT key to activate the

indicator will respond by adding an upward pointing arrow

to the data currently seen on the display.

Press the PORT key to activate the port select

function. Pressing the PORT key will result in the follow-

ing conﬁ guration options being displayed on the indicator.

Left Right Both

With the port select function activated press the

PORT key the required number of times to highlight the

word both from the list of port select options. Each time

the PORT key is pressed the next port select conﬁ guration

will be highlighted and be available for selection.

Left Right Both

With the word "both" highlighted and ﬂ ashing

press the enter key (ENT). The indicator will respond by

12345 12345

To tare both the displayed values press the TARE

key with both measured outputs shown on the display. The

will respond by displaying.

PSI

The T will appear to the upper left of the pressure

measurement being conducted in the tare mode for as long

To discontinue the tare mode of opera-tion press

the TARE key a second time. The tare function will be

the value of the pressure preload from the displayed pres-

+12345 +12345

10.3 Taring Either of Two Installed Pressure Sensor

This section only applies to indicators equipped with the

Determine which sensor assembly is to be tared.

The measured value from a sensor always appears

the instrument in which the sensor assembly is installed.

With the indicator on and displaying pressure

measurement data press the SHIFT key to activate the

functions. The indicator will respond by adding an

upward pointing arrow to the data currently seen on the

With the upward pointing arrow visible on the

function. Pressing the Port key will result in the following

L-R R-L L+R

With the port select function activated press the

PORT key the required number of times to leave activated

be tared press the PORT key the number of times neces-

Left Right Both

With the appropriate selection highlighted and

The indicator will respond by displaying following.

+12345 -----

With the measurement value to be tared on the

respond by taring out the displayed value. The tared value

will ﬂ ash on the display.

+00000 -----

The T will appear to the left of the pressure mea-

the pressure measurement value from the right sensor can

be returned to the display untared through the following

process.

Press the SHIFT key to activate the shift function

Assemblies

Page 16

indicator will respond by adding an upward pointing arrow

to the data currently seen on the display.

+00000 -----

With the upward pointing arrow visible on the

function. Pressing the Port key will result in the following

this example, the word "left" will be highlighted and ﬂ ash

the left pressure sensor assembly was active (measurement

values visible on the display)

L-R R-L L+R

With the port select function activated press the

PORT key the required number of times, 2 for this exam-

ple, to highlight the word “both”.

L-R R-L L+R

To activate (bring to the display) the measure-

ment values from both installed pressure sensor assem-

blies with the word “both” ﬂ ashing, press the enter key

following information.

+00000 +12345

When exiting the tare mode, only the measured

values currently being tared can be on the display. There-

fore, to exit the tare mode, when one of two installed

that is not being tared must be disabled (removed from dis-

play) using the PORT function. When, only the measure-

ment value that is in the tare mode is active, press the

TARE key. As shown below, the indicator will disable the

tare function, including removing the T from upper left

hand corner of the display.

psi -----

After the tare function has been disabled the second sensor

SECTION 11.0 DAMPING FUNCTION

The damping function provides the ability to stabilize the

bility. Damping is a secondary function and, therefore,

requires the use of the shift key to set up and implement.

The level of damping is set up through a damping menu

TARE/DAMP key.

Damping accomplishes the stabilization of the pressure

measurement value by producing an averaged pressure

value which is shown on the display and available for

transmission over the RS232 interface. When damping is

not activated the indicator takes a new pressure value over

required, this same measurement data is also available for

transmission over the RS232 interface.

When damping is activated the measurement value dis-

played and/or transmitted is an average value. With damp-

ing invoked the displayed value will be the average mea-

readings.

The following are the available levels of damping.

Level Effect

New every 130 mS, not averaged

LOW Averages 4 consecutive readings

Represents readings over 0.4 seconds

MEDIUM Averages 8 consecutive readings

Represents readings over 0.8 seconds

HIGH Averages 16 consecutive readings

Represents readings over 1.6 seconds

Programming and initiating the damping function is

This note only applies to instruments equipped with

the optional 2nd pressure sensor assembly.

Damping is a universal function. This means that the level

Damping cannot be enabled for one of two installed pres-

Press the SHIFT key one time. The indicator will

respond by adding an upward pointing arrow to whatever

information is currently presented on the display of the

indicator. For example, if the indicator is a dual sensor

instrument with the measurement values of both sensors

when the shift function is activated.

+12345 +12345

11.1 Setting, Activating & Disabling The Damping Function

Page 17

Press the TARE/DAMP key to activate the damp-

ing menu. The indicator will respond by displaying the

programmable levels of damping allowed.

OFF LOW

where:

Low = averaging of 4 consecutive readings

Medium = averaging of 8 consecutive readings

High = averaging of 16 consecutive readings

When the damping menu is activated the current level of

Press the DAMP key, as required, to highlight the

was pressed 2 times to highlight the medium damping level.

OFF LOW

MEDIUM HIGH

With the desired level of damping highlighted

resume the function of pressure measurement with the

ment value. Damping is also applied to any pressure mea-

effect until damping is turned off as detailed in Step 5

To disable damping press the SHIFT key one

time. The indicator will respond by adding an upward

pointing arrow to the display as shown.

+12345 +12345

Press the DAMP key to activate the damping

menu. The indicator will respond by displaying the pro-

in effect, if any, will ﬂ ash. In this case, medium damping

is in effect.

MEDIUM HIGH

Press the DAMP key, as required, to highlight the

was pressed 2 times to highlight off damping.

OFF LOW

MEDIUM HIGH

With the word "off" highlighted and ﬂ ashing

press the enter (ENT) key. Damping has now been dis-

to any displayed pressure measurement value. In indicators

with two sensor assemblies the programmed level of damp-

ing will apply to each of the displayed installed sensor

SECTION 12.0 MAX/MIN TRACKING FUNCTION

When measuring pressure the indicator constantly tracks

the minimum and maximum pressure measurement values

for each active pressure port. At the end of each measure-

ment cycle, after the electrical measurement from the pres-

mal errors, the indicator compares the measured value

with those stored in both minimum and maximum memory

locations maintained for each active pressure port.

If the measured value is found to exceed the previous

maximum value the reading is stored in memory, over-

writing the last stored value. Likewise, if the value, when

it will be stored in the memory over-writing the previous

minimum value for the given pressure port.

The values stored in the maximum and minimum memory

locations for each installed sensor can be reviewed at any

time by pressing the MIN/MAX/OUTPUT key. The fol-

lowing sections detail the method for reviewing and dis-

the current maximum and minimum pressure values for

below assume the indicator has two installed pressure

pressure sensor assembly the measurement values for that

Press the MAX/MIN/OUTPUT key. The indicator

will respond by displaying the maximum pressure and

minimum pressures measured since the memory locations

were cleared for each active sensor. The display will look

+12345 +12345

If the indicator is equipped with only one pressure

is active (measured outputs appearing on the display) the

indicator will display the maximum and minimum values

for a single sensor assembly. If a pressure sensor assembly

is not active minimum and maximum pressure measure-

ment data are not tracked and will not be displayed when

the MAX/MIN key is pressed.

(Maximum &Minimum Pressure Measurement Tracking)

12.1 Recalling and Maintaining Stored Max/Min Values

Page 18

To return to pressure measurement

without

eras-

ing the values stored in the maximum/minimum memory

locations press any key other than the enter (ENT) key.

The indicator will respond by returning to the basic pres-

+12345 +12345

12.2 Recalling Stored Max/Min Values and

below assume the indicator has two installed pressure

pressure sensor assembly the measurement values for that

Press the MAX/MIN/OUTPUT key. The indicator

will respond by displaying the maximum pressure and

minimum pressures measured since the memory locations

were cleared for each active sensor. The display will look

+12345 +12345

To erase the stored maximum and minimum

values and return to basic pressure measurement press the

measurement

+12345 +12345

If the indicator is equipped with only one sensor or only

mum values for a single sensor assembly. If a pressure

pressure measurement data will not tracked or displayed

when the MAX/MIN key is pressed.

values stored in the max/min memory locations will be

lost when the instrument is turned off.

will not appear even if checked immediately after clear-

ing the max/min memory locations. These values are

reset to +999999 for the minimum value and -999999

for the maximum value when the memory location is

mS after the memory has been cleared will produce a

new value in these memory locations. Even with no

pressure applied to a gauge, compound, vacuum or dif-

ferential pressure sensor assembly the high resolution of

the indicator will display slight zero offsets as measur-

tor to a true pressure change, the averaging software

used for damping is bypassed for the capture of maxi-

mum and minimum pressure values.

The output key provides access to the RS232 set up menus.

fore, requires the use of the shift key to initiate. The cali-

brator supports 3 communications protocols (print, remote

4800 & 9600).

testing and calibration and is not documented for customer

use. The following sections detail the set up of the remote

When the RS232 interface is not in use it should be

particularly important for instruments being powered by

the optional built-in nickel cadmium batteries. Activating

the RS232 interface results in an approximately 20-25%

increase in power consumption. This increase in power

Following, is detailed information on the RS232 interface.

The interface as deﬁ ned here is standard on all indicators.

Pin Function

2 Transmit data

3 Receive data

5 Ground

The RS232 requires a straight through cable type. This

will provide a 9 pin connector to the serial port on the

Pins

5 4 3 2

Pins

Erasing After Review

SECTION 13.0 RS232 OUTPUT FUNCTION

13.1 RS232 Connector

13.1.1 Connecting the RS232 Interface

Page 19

to select the same baud rate on the device as that to be

for the COM port on the computer, recorder or acquisition

For parity select none

For ﬂ ow control select none

To summarize:

none

through

13.1.2 The Remote Protocol

The remote protocol allows the operator to query instru-

ment status and conﬁ gure the indicator remotely over the

RS232 interface. When set up in the remote protocol mode

the operator can query and/or change the following instru-

ment set up and operating parameters over the RS232

interface.

protocol.

Query Set Up

Measurement value(s) yes n/a

Max/Min yes n/a

Last Error yes n/a

Battery Power Level yes n/a

Level Damp yes yes

Engineering Unit yes yes

Hold yes yes

Port Selection yes yes

Tare yes yes

The print protocol simpliﬁ es the process of conﬁ guring the

indicator for communication with an RS232 compatible

printer, dumb terminal or data acquisition system. Through

the print protocol the indicator can be set up to print

instrument front panel is pressed, at one of the factory

preprogrammed print intervals or when a CR (carriage

return) signal is received.

The set up function for the print protocol provides the abil-

ity to select the desired baud rate as well as the content of

The following procedure details how to set the indicator up

for use in the remote mode.

With the indicator on and displaying pressure

measurement value(s) press the shift key. In response to

pressing the shift key the indicator will display an upward

pointing arrow.

With the upward pointing arrow visible on the

respond by displaying the following.

ISO1745 PRINT

The RS232 conﬁ guration currently in use will ﬂ ash on the

With the selection of available interface protocols

interface option will be highlighted (ﬂ ash). With the word

respond be displaying.

300 600 2400

These numbers represent the baud rates (communication

with which the indicator is to communicate. As with the

RS232 protocol menu, the current baud rate selection will

Press the Output key the required number of times

to highlight the desired baud rate. Each time the Output

key is pressed the next baud rate option will be highlighted

two times to change the baud rate from 2400 to 9600. With

the desired baud rate ﬂ ashing press the enter key.

300 600 2400

The indicator will display the eight available end of mes-

is set for the device. The display of the available end of

message characters looks as follows.

CRLF CR EOT ,

ETX HTAB ; NULL

The decimal and hexadecimal representations of each

Appendix B.

13.2 Set Up of the Remote Protocol

13.1.3 The Print Protocol

Page 20

The indicator will automatically display the avail-

rently active ﬂ ashing.

Press the Output key, as required, to highlight the

text character is being changed from CRLF (carriage return

with a line feed) to a CR (carriage return only). With the

key. Although it is difﬁ cult to see, the indicator will brieﬂ y

Storing

This appears as the indicator writes the selected conﬁ gura-

tion data to the Electrically Erasable Programmable Read

the indicator will resume pressure measurement activities

with the display conﬁ gured as it was prior to entering the

+12345 +12345

The setup conﬁ guration, since it is stored in

EEPROM, will be retained in memory until a new conﬁ gu-

ration is programmed into the indicator.

The indicator is now ready for use in the remote communi-

notation conventions and numeric formatting, is provided

in Appendix A of this manual.

13.3 Set Up of the Print Protocol

The following steps should be followed to use the indicator

for use with an RS232 compatible printer, dumb terminal

With the indicator on and displaying pressure

measurement value(s) press the shift key. In response to

pressing the shift key the indicator will display an upward

pointing arrow.

With the upward pointing arrow visible on the

will respond by displaying the following.

OFF REMOTE

The indicator will automatically display the protocol

With the selection of available interface protocols

protocol options. Each time the OUTPUT key is pressed

the next interface option will be highlighted (ﬂ ash). In this

OFF REMOTE

With the word “print” ﬂ ashing press the enter key.

The indicator will respond by displaying.

300 600 2400

These numbers represent the baud rates (communication

with which the indicator is to communicate. As with the

RS232 protocol menu, the current baud rate selection will

Press the OUTPUT key the required number of

times to highlight the desired baud rate. Each time the OUT-

PUT key is pressed the next baud rate option will be high-

lighted (ﬂ ash). In this example the OUTPUT key will be

pressed four times to scroll from 300 baud to 9600 baud.

With the desired baud rate ﬂ ashing press the enter key.

300 600 2400

After the desired baud rate has be entered, the indicator

will display the eight available end of message characters.

As with the baud rate the end of message character must

be selected to be consistent with the requirements of the

CRLF CR EOT ,

ETX HTAB ; NULL

The decimal and hexadecimal representations of each

Appendix B.

The indicator will automatically display the avail-

Press the OUTPUT key as required, to highlight

the desired end of text selection. In this example the OUT-

PUT key will be pressed seven times to scroll from CR (car-

riage return) to CRLF (carriage return with a line feed).

CRLF CR EOT ,

ETX HTAB ; NULL

With the end of text character to be used ﬂ ashing

press the enter key (ENT). The indicator will respond by

Pressure

This allows for the selection of the content to be included

Page 21

1m 15m 1h Cont

As with the RS232 protocol menu, baud rate, end of text

frequency currently in use will automatically ﬂ ash on the

where:

Man the indicator will transmit the programmed data

Pace the indicator will transmit the programmed data

received.

Press the OUTPUT key to scroll through the

Man Pace 1s 15s

With the desired output frequency highlighted and

indicator will brieﬂ y display:

Storing

This appears as the indicator writes the selected conﬁ gura-

tion data to the Electrically Erasable Programmable Read

the indicator will resume pressure measurement activities

with the display conﬁ gured as it was prior to entering the

+12345 +12345

The indicator is now ready for use in the print mode.

The indicator can, optionally, be equipped with a back-

lit liquid crystal display. The back lit display provides

in the data string transmitted by the indicator. As with the

RS232 protocol menu, baud rate and end of text charac-

ter the data string content command currently in use will

following format: hold, damp, left tare, left data, left units,

right tare, right data, right units, end of message

Each ﬁ eld can have the following data:

with Function

Function Disabled Invoked

hold blank space “H”

2 for medium

3 for high

left tare blank space “T”

left data no data with displayed value

sensor inactive for left port

left units no data with engineering unit

sensor inactive of left port

right tare blank space “T”

right data no data with displayed value

sensor inactive for left port

right units no data with engineering unit

sensor inactive of left port

End of n/a end of text

message character

selected

No data will be transmitted for an inac-

tive port. If the indicator is conﬁ gured for differential pres-

replaced with the differential measurement indication for

that port.

All: The indicator will include all the above param-

Pres+EU: The indicator will transmit only the numeric

pressure value and the current engineering unit

in use.

Pressure: The indicator will only transmit the numeric

value of the pressure measurement values.

In this example, the data string will be changed

from All to pressure plus engineering unit. Therefore, the

All Pres+EU

With the desired data string output highlighted

respond by displaying the menu of available output fre-

quency options. The output frequency menu will appear as

follows.

Section 14.0 The Back Light Function (Optional)

Page 22

high glare conditions.

Use of the backlighting option greatly

increase the power consumption of the indicator. The

useful life of the optional built-in nickel cadmium power

pack will be greatly reduced by continuous use of the back

light function. It is estimated that the power pack will pro-

vide 5 hours of operation with continuous use of the back

lighting function.

The operation of the back lighting option is included in the

following two sections.

14.1 Timed Back Light Function

The back light function can be initiated so that it will

To use the timed back light function, with the indicator

BATT/LITE key once. The back light will be turned on and

will stay on for 1 minute. After the 1 minute interval is

light function and return to displaying data and measure-

ment information in the standard non-backlit mode.

The back light function can be initiated so that it will stay

function in the continuous mode the following procedure

With the indicator on and displaying pressure

measurement data press the BATT/LITE key once. The

indica-tor will respond by lighting the liquid crystal dis-

play.

To implement continuous back lighting, press the

LITE key while the back light is on. The back light func-

tion will now stay on until turned off by the operator.

In order to disable continuous back lighting

mode.

The battery check function provides a means to determine

the remaining power level of the nickel cadmium power

pack. In addition, the battery check function provides a

means at looking at the internal voltage regulation of the

indicator when the instrument is being powered off the

To use the battery check function follow the procedure

below.

With the indicator on and displaying pressure

measurement data press the SHIFT key. The indicator will

respond by adding an upward pointing arrow to the display

to indicate the instrument is in the shift mode.

^ psi psi

With the upward pointing arrow visible on the

respond by displaying the current battery voltage. The bat-

tery voltage measurement will look as follows.

Battery Voltage

+x.xx

The voltage measurement will remain on the display for

the display conﬁ guration that was in use prior to perform-

ing the battery voltage check.

A low battery icon is provided on indicators equipped

with the battery option. The unit will display a ﬂ ashing

battery icon indicating that the batteries have discharged

to the point of having insufﬁ cient voltage (5.6 Vdc) to

The hold function allows the operator to freeze the dis-

played measurement data at the push of a key. The hold

function is considered an “immediate need” function. As

The hold function is a universal function. Use of the

hold function freezes the entire display of the indicator.

The indicator cannot freeze the data for one of two dis-

played pressure measurement assemblies.

The following procedure details the use of the hold function.

With the indicator on and displaying pressure

measurement data, to freeze the displayed data simply

press the HOLD key one time. The indicator will respond

by adding a small “H” to the upper left side of the display.

When in the hold mode the displayed data will look as

follows.

+12345 +12345

To exit the hold mode press any key.

The indicator will remain in the hold mode until a

key is pressed.

14.2 Continuous Back Light Function

15.2 Low Battery Indicator

Section 16.0 The Hold Function

SECTION 15.0 BATTERY CHECK FUNCTION (for use in indicators with optional built-in batteries)

15.1 Using Battery Check Function

16.1 Using The Hold Function

Page 23

SECTION 17.0 THE PRINT FUNCTION

The print key, when used with the RS232 interface allows

the operator to print, on command, pressure measurement

function. If the indicator is not set up in the print mode the

instrument will display the following error message when

the PRINT key is pressed.

PRINT protocol

After displaying the above error message the indicator

will resume basic pressure measurement activities. If it is

this operation.

To print pressure measurement data follow the steps below.

Be certain the conﬁ guration settings are

tion system with which the indicator is to communicate.

With the measurement data to be “printed” press

the PRINT key. The measurement data as conﬁ gured in

ing device.

As long as the indicator is set up with the RS232 interface

in the print protocol it will remain ready to transmit mea-

receiving device.

When the RS232 interface is not in use

it should be disabled by selecting the word “off” from

the RS232 protocol menu. When the off option is selected

the circuitry that supports the interface is powered down.

This conserves on power consumption. Reducing power

being powered by the optional built-in nickel cadmium

batteries. Activating the RS232 interface results in an

This increase in power consumption will produce a cor-

responding 20-25% decrease in battery life. See section

The system can be used with most standard RTDs (Resis-

tance Temperature Detectors) to provide precision temper-

installed in one of the sensor assembly positions in order

for the system to perform temperature measurement with

the system base unit and the RTD probe.

The capabilities of the interface assemblies are summa-

rized below:

-200 to 550° C:

0.15° C 550 to 850° C:

0.2° C

80 to 260° C:

0.1° C

70 to 150° C:

0.6° C

+0.01% reading +0.02 ohms

184 to 275° C:

0.15° C

Fahrenheit, Celsius, Kelvin, Rankine or ohms

RT1 module:0/400 ohms

RT2 module: 0/4000 ohms

The interface assembly incorporates a Switchcraft TA4M

type connector and requires an RTD with the appropriate

the appropriate mating connector is part number 828X136-

01. The pinout assignments are as follows:

Turn the system on by pressing the On/Off key.

To access the temperature setup menu press the

The will respond by displaying the following:

With the upward pointing arrow displayed press

the PORT/UNIT key one time to activate the port select

function. The indicator will respond by displaying:

Left Right Both

The Left minus right (L-R), right Minus left (R-L)

Pin Function

1 2 Wire +

2 4 Wire +

3 4 Wire –

4 2 Wire –

Pin Function

1 2 Wire +

2 4 Wire +

3 4 Wire –

4 2 Wire –

17.1 Using The Print Key

SECTION 18.0 TEMPERATURE MEASUREMENT USING RTD PROBES

18.1 Setting Up the System for Temperature Measurement

Page 24

with two installed pressure sensors are disabled when a

temperature measurement assembly is installed in one of

the two sensor locations.

As required, press the PORT/UNIT key until the

port that the RT interface assembly is installed in ﬂ ashes

in the left sensor location.

Left Right Both

With the text “Left” ﬂ ashing press the enter key

The system will respond by displaying:

2W 3W 4W

This represents the conﬁ guration of the RTD to be used,

where the number equals the number of wires the RTD

uses.

The use of a 4 wire RTD is recommended for opti-

mum accuracy.

Using the PORT/UNIT key select the appropriate

below the 4 wire conﬁ guration was selected.

2W 3W 4W

With the desired wiring conﬁ guration selected press

the enter key (ENT).

The system will respond by displaying the available units

Engnring units:

Using the PORT/UNIT key select the desired

With the desired engineering unit selected

The system will respond by displaying the following:

Probe: 12345678

probe will appear selected. Use the PORT/UNIT key to

programmed for the following RTDs.

Position Probe

1 �385 -200/850 degrees C

Ni Minco

4 Cu 10 ohm

5-8 available for programming using the optional

RT1 module, part number 838X014-01 for 3 ½

inch disks.

with output resistance values of 0 to 400 ohms. Use of the

module with higher resistance RTD probes will result in

The RT2 is pre-preprogrammed for the following RTDs

Position Probe

1 Pt

2-8 available for programming using the optional

RT2 module, part number 838X014-01 for 3 ½

inch disks.

with output resistance values of between 1000 and 4000

tance RTDs accuracy will be greatly diminished. In addi-

tion, use of the module with higher resistance RTD probes

will result in diminished accuracy and possible damage to

the module electronics.

Using the left/right arrow keys select the RTD

probe type for the measurements to be made. In the

PT 100 type 385

a385 -200/850

With the desired probe type selected and

ﬂ ashing press the enter key (ENT).

The system will respond by displaying the following:

1 .1 .01 0.001

The maximum resolution that the combination of the indi-

the RTD module is 0.001% of the full scale resistance of

the reference resistor used in the module. The RT1 incor-

porates a 400 ohm reference resistor and the RT2 incorpo-

rates a 4000 ohm reference resistor.

Page 25

SECTION 19.0 CALIBRATING THE INDICATOR

The indicator provides the ability to perform calibration

terminal is required to perform a complete recalibration

values. In most cases zero and span adjustment will be all

that is required to recalibrate the instrument.

The following sections detail the methodologies for zero/

This procedure details the method for performing a calibra-

tion level zero and span of any installed pressure sensor

Be certain that the indicator is set up in accordance with

the requirements outlined in Section 8 Zeroing Indicator

for the pressure sensor assembly to be zeroed and spanned.

With the indicator off press and hold the PRINT

key. While holding the PRINT key press the POWER key.

After the unit begins the start up process the PRINT key

pressure sensor assemblies, after the start up screens have

following.

Left Right

The left port will be the default calibration port and will

To select:

The Left Port (sensor assembly in left side of indicator):

Press the enter key (ENT)

The Right Port (sensor assembly in left side of indicator):

Press the PRINT key one time. The indicator will respond

by changing the highlighted port selection to the right port.

Pressing the PRINT key a second time will return the left

With the port corresponding to the pressure sensor to be

The indicator will respond by displaying the following.

psi “Hg “WC ftSW

Using the RT1 as the example the maximum resolution is:

0.001% of 400 ohms

= 0.00001 x 400 = 0.004 ohms

For a Pt 100 the temperature resolution can be determined

0.004 ohms/(100 ohms x 0.00385 ohms/degree C) = 0.008

Therefore, rounding to the next highest digit results in a

resolution of 0.01 degrees C.

The resolution supported for the factory programmed

RTDs can be found below:

Probe type Resolution

Pt 100 0.01 degrees C or F

(385 & 392)

Ni 120 0.1 degrees C or F

Cu 10 0.1 degrees C or F

Probe type Resolution

Pt 100 01.0 degrees C or F

Resolution must be selected in conjunction with the full

Select the desired resolution using the PORT/

UNIT key. In this case, since we are using the Pt100 RTD

with a maximum resolution of 0.01 degrees C the 0.01

Resolution:

With the desired resolution selected and ﬂ ashing

press the enter key (ENT).

The system will brieﬂ y show internal limit settings and

will then commence temperature measurement.

The measurement parameters can be changed at any time

through the activation of the RT set up menu via selection

The RT can be programmed in the ﬁ eld. Programming,

plished with the Calibration Programming Utility disk part

number 838X014-01 (3 ½ inch disk). Please note, in order

to improve the accuracy of the measurement system it

will be necessary to generate a signiﬁ cant number of very

temperature baths. In general, the simplest way to enhance

the accuracy of the temperature measurement is to simply

re-zero the probe while immersed in an ice bath.

19.1 Adjusting Calibration Zero and Span Settings

18.2 Calibrating/Programming the RT RTD Assemblies

Page 26

2nd screen

mmHg cmWC mmWC kgcm

The indicator will automatically default to the

primary engineering unitfor the pressure sensor to be

key until the desired unit isﬂ ashing on the display. With

the desired unit ﬂ ashing on the display press the enter key

The indicator will respond by displaying the following:

Zero/Full Scale

The zero/full scale option allows for re-zeroing and re-

REMOTE option provides the ability to re-zero, re-span

The Calibration Remote option is detailed in the next sec-

tion of this manual.

To perform a re-zero and re-spanning of the pressure

press the enter key (ENT). The indicator will respond by

X.XX MODE

where:

X.XX: represents the zero offset.

Unit: represents the engineering unit select

To re-zero the pressure sensor assembly apply

vacuum sensor to atmosphere or pull a hard vacuum for an

With the proper zero applied press the ZERO key. The

indicator will respond by displaying the following

000 MODE

Indicating that any zero offset has been eliminated

Apply full scale pressure and allow the measured

value shown below the engineering unit designation to

Adjust the displayed pressure measure-ment value

to equal that of the applied pressure.

Use the:

TARE key: To decrease the displayed pressure value.

MAX/MIN Key: To increase thedisplayed pressure value.

The required key should be pressed the number of times

required to make the displayed pressure value equal that of

the applied pressure value.

When the displayed pressure value andthe applied

pressure input are the samepress the enter key (ENT).

The indicator will respond by displaying:

Storing Data

This will appear on the instrument display for approxi-

mately 5 seconds

Next, the indicator will display:

Yes No

Use the PRINT key to make the desired selection. With the

19.2 Performing A Complete Recalibration

This section details the process for performing a complete

recalibration of the indicator.

If the pressure sensor assembly has not been zeroed and

point should be the zero pressure input and the last pres-

just been re-zeroed and re-spanned, per the instructions

in section 18.1, then these points can be omitted from

the linearization process. In this case the ﬁ rst linearization

point will be the ﬁ rst non-zero pressure input and the last

linearization point will be the pressure input prior to the

full scale input.

The following are the minimum recommended number of

linearization points:

enhanced temperature performance

Page 27

The indicator can accommodate a maximum of 20 calibra-

tion points, including zero and span. Enhanced tempera-

ture performance sensors meet accuracy speciﬁ cation

though temperature range of 20-120 degrees F. Tem-

perature error will not result in instrument performance

19.2.1 Terminal Requirements for Performing A

In order to calibrate pressure sensors in the indicator the

indicator must be connected to a terminal for data entry

Baud Rate: 2400

Data Bits: 8

Parity: None

Flow Control: Xon/Xoff

In addition the indicator RS232 Remote interface should

be set up as follows:

Baud Rate: 2400

End of

Text Message: CRLF

The RS232 interface does not have to be active in the

remote mode when initiating the calibration function as the

indicator will activate the Remote mode operation when

the Calibration-REMOTE selection is made from the main

This procedure details the method for performing a calibra-

tion zero and span of any installed pressure sensor assembly.

With the indicator off, prior to initiating the calibration

process, connect the indicator to the desired serial port of the

number 838X011-01) will connect the indicator to a stan-

port connector on the terminal or computer.

Be certain that the indicator is set up in accordance with

the requirements outlined in Section 8, Zeroing Indicator,

for the pressure sensor assembly to be zeroed and spanned.

Be certain the indicator has been connected to the

terminal or computer prior to powering up the indicator

With the indicator off press and hold the PRINT

key. While holding the PRINT key press the POWER

key. After the unit begins the start up process the PRINT

key can be released. If the indicator is equipped with two

pressure sensor assemblies, after the start up screens have

following.

Calibrate Port?

If the indicator is equipped with a single pressure

To select:

The Left Port (sensor assembly in left side of indicator):

Press the enter key (ENT)

The Right Port (sensor assembly in left side of indicator):

Press the PRINT key one time. The indicator will respond

by changing the highlighted port selection to the right port.

Pressing the PRINT key a second time will return the left

With the port corresponding to the pressure sensor to be

The indicator will respond by displaying the following.

psi “Hg “WC ftSW

Bar mBar kPa mPa

2nd screen

The indicator will automatically default to the

primary engineering unitfor the pressure sensor to be

key until the desired unit isﬂ ashing on the display. With

the desired unit ﬂ ashing on the display press the enter key

The indicator will respond by displaying the following:

Zero/Full Scale

Calibrate REMOTE

The zero/full scale option allows for re-zeroing and re-

REMOTE option , as detailed in this section provides the

using a terminal or computer. The Zero/Span option is

To perform a complete recalibration/relinearization of the

highlight the text "Calibration- REMOTE". With the text

After pressing the enter key the following text

will appear on the screen of the terminal.

Complete Recalibration

19.2.2 Performing A Recalibration/ Relinearization of the Indicator

Page 28

Z zero

F full scale

L linearity

X exit

In some cases the indicator may miss getting the

typing the letter for the desired selection and pressing the

ENTER key on the computer/terminal keyboard.

The procedures for performing each of these functions

Remote Zero: 19.2.3

Remote Span: 19.2.4

Remote Linearity: 19.2.5

19.2.3 Remote Zero Adjustment

The indicator must be connected to the computer or termi-

nal being used for data input and review as outlined in

If the indicator is already in the Remote Calibration

mode skip directly to step 6

With indicator off connect unit to a computer or

terminal as outlined is section 18.2.1

Press the PRINT key on the indicator and while

holding the PRINT key press the POWER key. After the

indicator display will show the following query.

Left Right

Using the PRINT key highlight the sensor to be

The indicator will respond by displaying the following.

psi “Hg “WC ftSW

2nd screen

The indicator will automatically default to the

primary engineering unitfor the pressure sensor to be

key until the desired unit isﬂ ashing on the display. With

the desired unit ﬂ ashing on the display press the enter key

The indicator will respond by displaying.

Calibrate REMOTE

To adjust the calibration zero via the remote mode

press the PRINT key one time to highlight the text "Cali-

brate REMOTE".

With the text "Calibrate REMOTE" ﬂ ashing press

the ENTER key. The indicator will respond by transmitting

the main calibration menu to the computer/terminal display

Z zero

F full scale

L linearity

X exit

the letter Z. With the letterZ typed, pressed the Enter key

lowing information for display on the screen.

Apply ZERO pressure and press ENTER

Apply the appropriate zero pressure. Be certain a good

isand absolute unit.

With the correct zero pressure applied press the Enter key

The will respond by transmitting the following information

for display on the screen of the computer/terminal.

The indicator will respond by displaying 8 readings. These

readings represent the ampliﬁ ed voltage output of the

nominal ampliﬁ ed output range for all sensor assemblies is

0/1 Vdc for zero to full scale pressure. After the completion

value of the reading to establish the new correction value

for the zero linearization point.

The sequence of events will appear as follows.

+0.000001

-0.000000

+0.000001

+0.000000

Sensor ZEROED

After completion of the zeroing procedure the indicator

Page 29

will once again display the main calibration menu as follows.

Z zero

F full scale

L linearity

X exit

To complete the zero adjustment process and exit

the calibration menu Type X on the keypad and press the

Enter key. For information on adjusting the full scale value

proceed to Section 19.2.4

The computer/terminal will respond by displaying:

y- yes n-no

To Save calibration data type "y" and press the

respond by displaying

Storing data

19.2.4 Remote Full Scale Adjustment

The indicator must be connected to the computer or termi-

nal being used for data input and review as outlined in

If the indicator is already in the Remote Calibration

mode skip directly to step 6

With indicator off, connect the unit to a computer

Press the PRINT key on the indicator and while

holding the PRINT key press the POWER key. After the

released. At the end of the start up sequence the indicator

Left Right

Using the PRINT key highlight the sensor to be calibrated.

With the sensor to be calibrated ﬂ ashing on the

by displaying.

Zero/Full Scale

Calibrate REMOTE

To adjust the calibration zero via the remote mode

press the PRINT key one time to highlight the text "Cali-

brate REMOTE".

With the text "Calibrate REMOTE" ﬂ ashing press

the ENTER key. The indicator will respond by transmitting

the main calibration menu to the com- puter/terminal dis-

play as follows.

Z zero

F full scale

L linearity

X exit

the letter F. With the letterF typed, pressed the Enter key on

thekeyboard. The will respond by transmitting the follow-

ing information for display on the screen.

Apply FULL-SCALE pressure and then enter applied pres-

Apply the appropriate full scale pres-sure to the sensor

being adjusted.

With the correct full scale pressure applied to

the sensor and the corresponding value typed into the

the computer orterminal device being used. The indicator

will respond by transmitting for display measurement 8

measurement readings for the applied full scale pressure.

These readings represent the ampliﬁ ed voltage output of

the sensor assembly at the applied pressure or vacuum. The

nominal ampliﬁ ed output range for all sensor assemblies is

0/1 Vdc for zero to full scale pressure. After the completion

full scale linearization point. The sequence of events will

+1.000001

+1.000000

+1.000001

+1.000000

Sensor FULL-SCALE

After the above message has been displayed the indicator

will then return to the main calibration menu as follows.

Z zero

F full scale

L linearity

X exit

To complete the full scale adjustment process and

the Enter key. For information on adjusting the lineariza-

tion values proceed to section 18.2.6. Resetting of calibra-

tion zero was covered in Section 19.2.4.

The computer/terminal will respond by displaying:

Page 30

y- yes n-no

To Save calibration data type "y" and press the

respond by displaying

19.2.5 Remote Adjustment of Linearization Values

The indicator must be connected to the computer or termi-

nal being used for data input and review as outlined in

If the pressure sensor assembly has not been zeroed and

point should be the zero pressure input and the last pres-

just been re-zeroed and re-spanned, per the instructions

in Section 19.1, than these points can be omitted from

the linearization process. In this case the ﬁ rst linearization

point will be the ﬁ rst non-zero pressure input and the last

linearization point will the pressure input prior to the full

The Following are the minimum recommended number of

linearization points:

enhanced temperature performance

The indicator can accommodate a maximum of 20 calibra-

tion points, including zero and span. Enhanced temperature

performance sensors meet accuracy speciﬁ cation though

temperature range of 20-120 degrees F. Temperature error

will not result in instrument performance exceeding rated

The indicator must be connected to the computer or termi-

nal being used for data input and review as outlined in

If the indicator is already in the Remote Calibration

mode skip directly to step 6

With indicator off connect unit to a computer or

terminal as outlined is section 19.2.1

Press the PRINT key on the indicator and while

holding the PRINT key press the POWER key.

After the start up sequence has commenced the PRINT

keycan be released. At the end of the start up sequence the

indicator display will show the following query.

Calibrate

Using the PRINT key highlight the sensor to be calibrated.

With the sensor to be calibrated ﬂ ashing on the

Zero/Full Scale

Calibrate REMOTE

To adjust the calibration zero via the remote mode

press the PRINT key one time to highlight the text "Cali-

brate REMOTE".

With the text "Calibrate REMOTE" ﬂ ashing press

the ENTER key.

the letter L. With the letter L typed, press the Enter key

information for display on the screen.

C- cancel

P- Proceed

Typing "C" on the keyboard of the computer/terminal and

pressing will result in escaping from the linearization pro-

Typing "P" on the keyboard of the computer/terminal will

Enter key on the keyboard of the computeror terminal. In

response to the "P" entry the indicator will transmit the

following information for display on the screen of the

Linearity point 1:

Apply pressure then enter applied pressure and

press Enter.

The ﬁ rst applied pressure can be either zero or, if the

indicator has just been rezeroed and respanned, can be

the ﬁ rst non-zero calibration point. In general, it is recom-

mended that both zero and full scale calibration points be

incorporated in the linearization process.

In response to the request for the ﬁ rst linearity point the

brated.

into the terminal/computer press the Enter key on the

Page 31

keyboard.If zero is used the indicator will respond by

These readings represent the ampliﬁ ed voltage output of

the sensor assembly at the applied pressure or vacuum.

The nominal ampliﬁ ed output range for all sensor assem-

blies is 0/1 Vdc for zero to full scale pressure. After the

rection. The sequence of events will appear as follows.

+0.000001

-0.000001

+0.000001

+0.000002

If the ﬁ rst linearization point is zero the displayed voltage

values will be close to zero. The voltage output displayed

will increase in direct proportion to the level of applied

pressure or vacuum as a percent of the full scale range of

the sensor assembly. After presenting the 8 readings the

indicator will calculate the average value and use it to

the indicator will display the following requesting the next

linearization point..

Linearity point 2: Apply pressure then enter applied pres-

In response to the request for the second linearity

point the operator should:

brated.

the terminal/computer press the Enter key on the Key-

board. At a minimum the following linearization points

enhanced temperature performance

In the case where the ﬁ rst non-zero linearization point

is taken at 10% of the sensors range the indicator will

respond by displaying 8 readings of approximately 10% of

the 1 Vdc full scale output or 0.10000. After the comple-

tion of the eight readings the indicator will use the average

value of the reading to establish the new correction value

for the second linearization. The sequence of events will

The difference between the displayed measured

voltage and the ideal voltage of 0.100000 represents the

non-linearity of the sensor. This linearization process will

ity.

+0.100020

+0.100023

+0.100022

+0.100021

Linearity point 3: Apply pressure then enter

Repeat the process, as outlined in step 7, for each

linearization point to be done. To optimize measurement

very close the full scale range of the sensor being cali-

brated.

If the last linearization point is done at the full scale value

0.1% of the full scale value) will use the this point as

0.1% of

full scale the indicator will retain the last span setting

point be within +0.1% of the full scale range of the sensor

To complete the calibration process, without entering a

numeric value for a new linearization point, press the enter

key on the keyboard of the terminal/computer being used

transmitting the following information to the screen of the

terminal/computer.

Linearization Done

S- SAVE

C- Cancelled

transmitted to the screen of the computer/terminal.

wait

Storing Data

transmitted to the screen of the computer/terminal

Linearization cancelled

old lin data retained

Page 32

Typing and entering "C" on the key-board of the terminal/

ization process and retain old linearization data in the

EEPROM memory

It is not recommended that a calibration point by

placed within 1% of either the zero or span values for the

within the

pressure measurements beyond the range limits of the

instrument could subject to very large inaccuracies.

Regardless of the placement of calibration points, it is not

recommended that indicator sensors be used outside the

**********IMPORTANT NOTE**********

After saving the new linearization data the calibration

from the main calibration menu. Failure to do this will

After entering your selection to step 8

the indicator will respond by transmitting the main calibra-

tion menu to the screen of the terminal/computer being

used for the calibration interface.

The main calibration menu will appear as follows.

Z zero

F full scale

L linearity

X exit

To exit the calibration mode type and enter "X" from the

keyboard of computer/terminal being used as the calibra-

tion interface.

After typing and entering the "X" the indicator will

transmit the following information to the screen of the

yes

Type and enter "Y" on the keyboard of the computer/

terminal to save data. When "Y" is entered the text

"Storing data"

REMOTE Calibration SAVED

will appear on both the display of the indicator as well

result in the text

being displayed on the screen of the computer/terminal

After entry of either "Y" or "N" the will resume normal

pressure measurement activities

SECTION 20.0 INSTALLING A SECOND PRESSURE OR

This section details the procedure for adding a second

pressure sensor assembly in an instrument that previously

had a single sensor or changing an installed sensor assem-

bly. indicator pressure sensor assemblies can be added or

requirements of any speciﬁ c measurement exercise to be

performed. The calibration data for each pressure sensor

Programmable Read Only Memory) located within the

pressure sensor assembly. As such, pressure sensor assem-

blies can be installed in any instrument, originally sold for

the required accuracy, and provide the rated accuracy of

the pressure sensor assembly.

To install a second pressure sensor assembly or change an

installed sensor assembly follow the procedures detailed in

prior to initiating any of the procedures detailed in this

performed by individuals experienced with working on

precision electrical test equipment.

initiating this process. Failure to do so could result in

instrument damage due to electrostatic discharge.

Power down the indicator and unplug from the ac

Place the indicator top down on a workbench and

remove the four (4) feet by removing the phillips head

halves together, pick up the indicator. With the instrument

right side up separate the two case halves.

If a sensor is to be installed in a sensor location

that currently is empty proceed to step 7.

To remove a pressure sensor assembly ﬁ rst disconnect the

ribbon cable between the main board and pressure sensor

Looking at the rear panel, remove and retain

the three (3) phillips head screws that hold the sensor in

position. When removing the last screw, hold the pressure

instrument.

CHANGING SENSOR ASSEMBLY

20.1 Procedure for Installing or Changing a Pressure Sensor Assembly

Page 33

After the last screw has been removed, carefully

lift the pressure sensor assem-bly from the instrument

housing by lifting out and up the end with the ribbon cable

If a pressure sensor assembly is being installed

in the second sensor location for the ﬁ rst time remove

the pressure connection cover by removing the three (3)

phillips head screws that hold it in place. After the screws

have been removed, set aside the cover plate and retain for

future use. Install sensor through the rear panel with the

label side up.

Align the sensor so that the three (3) phillips head

For ﬁ rst time installations, connect the small ten

the larger 10 pin connector to the connector on the printed

If the sensor has been installed for the ﬁ rst time

front board set (switch and display board set) up and out

housing. The ribbon cable between this board set and the

main board can remain connected.

For installation of replacement sensors only: If

the sensor installed is replacing a different range sensor

remove the range indication label on the front panel by

front panel. Retain range label with removed sensor for

future use.

For installation of all other sensors: Locate the range indi-

which the pressure sensor assembly has been installed.

Lift the front board set up and slide back into the

retaining groove in the bezel in the front of the case of

the indicator. Be certain board set is ﬁ rmly seated in the

Replace the top cover of the instrument, carefully

front board set in the front of the indicator.

Carefully, holding the two case halves together,

place the indicator top side down on a workbench.

Re-install the four (4) rubber feet. Do not over-

tighten the phillips head screwsthat hold feet in position.

Installation of the pressure sensor assembly is now com-

plete. General use of the indicator can now be resumed.

Section 21.0 Replacement of Optional

the ability to recharge sufﬁ ciently to provide any long

term use capability. When this occurs the nickel cadmium

power pack must be replaced. The following section

in rechargeable power pack.

prior to initiating any of the procedures detailed in this

performed by individuals experienced with working on

precision electrical test equipment.

initiating this process. Failure to do so could result in

instrument damage due to electrostatic discharge.

The optional built-in power pack uses 5 standard AA

nickel cadmium rechargeable batteries. Use of any other

battery type could cause damage to the indicator as well

AA RECHARGEABLE NICKEL CADMIUM BATTERIES

Power down the indicator and unplug from the ac

Place the indicator top down on a workbench and

remove the four (4) feet by removing the phillips head

halves together, pick up the indicator. With the instrument

right side up separate the two case halves.

Disconnect, at the main board, all ribbon cable

These include;

main board

Cadmium Batteries

21.1 Procedure for Installing Replacement Nickel Cadmium Batteries

Page 34

4- cable between the switch board and the main board (left

front)

Remove the front board set by lifting upward out

Remove four phillips head screws that retain main

board. One screw in each of the rear corners of the main

board. One on the left side of the main, just in from the cut

board just behind the cut out in the board.

to bend the pin connections between the main board and the

power supply board. This will expose the battery holders.

To replace the batteries, lift off each battery

retaining clip by placing a small screwdriver in the gap

between the battery contact and the end clip. Gently angle

the screwdriver handle toward the center of the individual

battery holder to disengage clip. Repeat procedure on clip

With all the battery retaining clips removed, care-

fully remove each of the installed batteries.

Install 5 new AA rechargeable batteries. Be cer-

tain to follow polarity instructions

provided in each of the battery receptacles.

After all 5 batteries have been replaced, re-install

the 5 battery retaining clips by aligning the clip over the

battery recep-tacle and pressing down evenly on each end

Replace main board, carefully aligning the pin

Hints to help when changing batteries:

pins is positioned to the front of the indicator during

main board installation2)Aligning the screw holes with

the main board mounting posts will facilitate the align-

ment of the pin connection between the main board and

the power supply board.

the four (4) retaining screws used to hold the main board

in position.

Re-connect the three ten pin connectors in the rear

panel to receptacle on the left rear of the main board.

tacle directly in front of it on the main board.

boards) into the groove in the bezel on the front of the

instrument case. Make sure the board set is seated all the

way in the groove.

Reconnect the cables between the main board

right side of the front board set to the eight (8) pin (single

row) connection on the front right side of the main board.

pin connector on the front left side of the main board.

Replace the top cover of the instrument, carefully

front board set in the front of the indicator.

place the indicator top side down on a workbench.

Re-install the four (4) rubber feet. Do not over-

tighten the phillips head screws that hold feet in position

Installation of the replacement batteries is now complete.

SECTION A-1.0 INTRODUCTION

The remote RS232 interface is designed to provide the user

with:

tion regarding the various user programmable set up

terminal or computer.

tor receives an unrecognized command it will respond with

Important Note:

When the indicator is in the remote

mode local (keypad activity) is locked out. The indica-

tor must be removed from the remote operating mode to

restore access to front panel functionality.

Page 35

SECTION A-2.0 NOTATION CONVENTIONS

This appendix uses the following conventions:

Bold, uppercase letters indicate a com-

mand name

italicized letters indicate command

parameters

parameter

USER I/O Gothic letters indicate literal user I/O

Numeric arguments may contain the following characters;

will be truncated to an integer value. For example, a

numeric input of 2.7 will be truncated to 2. There is no

requirement in the indicator communication protocol for

the use of numeric values that are not whole numbers.

Each allowable entry is listed alphabetically. The informa-

tion contained herein will provide details on the action

performed as the result of each allowable command as

well the proper syntax to use. A remarks section, providing

included, as required, for each command. The expected

return values (response of the indicator to the speciﬁ c

SECTION A-3.0 NUMERIC FORMAT

SECTION A-4.0 COMMAND REFERENCE

Page 36

SECTION A-5.0 COMMAND LIBRARY SUMMARY

Where input ﬁ elds for two numeric values are provided for independent setting can be accommodated for both installed

pressure sensor assemblies in indicators with optional second sensor.

Command Expected Result

? Indicator transmits numeric pressure value for active installed

pressure sensor assemblies

BATCK? Indicator transmits battery level in volts (numeric only)

DAMP? Indicator transmits numeric value from 0-3 representing level of

damping invoked

DAMP_0 Sets level of damping off

DAMP_1 Sets level of damping to low

DAMP_2 Sets level of damping to medium

DAMP_3 Sets level of damping to high

EUNIT? Indicator transmits numeric value for engineering unit in use for

active sensor(s) where:

Response Represents

-1 leave as is

1 psi

2 “Hg

3 “WC

4 ftSW

5 bar

6 mbar

7 kPa

8 MPa

10 cmWC

11 mmWC

12 kgcm

EUNIT X [,X] Command to change engineering unit(s) numeral in [ ] would be for

optional second (right) sensor.

HOLD? returns 0 or 1 where:

0 = hold off

1 = hold active

HOLD_0 Disable hold function

HOLD_1 Activates hold function

KEYLOCK? Requests status of keypad lockout function returns 0 or 1 where:

Response Represents

0 Keypad is disabled

1 Keybpad is enabled

KEYLOCK_0 Enables keypad

KEYLOCK_1 Disables keypad.

LASTERR? Provides information on last error.

MIN/MAX? Indicator transmits minimum & maximum value of any

MIN/MAX [ ] [, ] Indicator transmits minimum & maximum value of any active

sensor(s)

use: 0 or -1 to review and not reset values

use: 1 to review and reset values

PORT? Indicator transmits numeric value of

0-4 representing current conﬁ guration.

POR_ 0 Set indicator for left port active only

PORT_1 Set indicator for right port active only

PORT_2 Set indicator for left & right ports active

PORT_3 Set indicator for left - right (differential)

PORT_4 Set indicator for right - left (differential)

TARE? Indicator transmits numeric value representative

of current tare status.

TARE X [,X ] where: numeric value -1 = leave as is

numeric value 0 = deactivate tare

numeric value 1 = activated tare

ZERO X [,X] where: numeric value -1 = leave as is

numeric value 1 = establish new zero value

Page 37

2. If there is no response, check cable connec-

tions, cable type (modem vs.thru), Com Port,

3. If communication is established proceed to

III Veriﬁ cation Procedure - Baud Rate

A. Verify communication at all selectable baud

rates.

B. Conﬁ gure the serial port on the indicator

1. Press “Shift”

2. Press “Output” repeatedly until the menu

3. Press “Enter”.

4. Press “Output” repeatedly until “4800” is

5. Press “Enter”

6. Press “Output” repeatedly until CRLF (car-

riage return & line) is ﬂ ashing

7. Press “Enter”. The indicator’s serial port is

now conﬁ gured for 4800 baud communication

with CRLF appended to data packet.

C. Conﬁ gure the com port in the PC Terminal

application.

1. Click on the

2. Click on 4800 Baud, 8 Data Bits, 1 Stop Bit,

Parity None, Flow Control None ,select the

Terminal application is now conﬁ gured to

Remote Mode.

D. Verify Communication at conﬁ gured Baud Rate

1. Type a question mark character and press

0.004469,-0.000227

2. If there is no response, check cable connec-

tions, cable type (modem vs.

thru), Com Port, and repeat steps B and C

3. If communication is established repeat steps

B through D, changing the baud rates to 2400,

is encountered note it in the notes column and

APPENDIX A – INDICATOR SERIAL PORT FUNCTIONS

The following procedure can be employed for veriﬁ cation

understanding of the command library for integration into

I. Equipment Requirements.

A. Indicator with one or two sensors

B. DB 9 Pin serial connector cable wired for straight

through operation

C. HVC, ﬁ ttings and plumbing to generate pressure

D. PC with Windows, Terminal application and

open com port

II. Test setup

A. Connect cable to Indicator serial port and

PC com port.

B. Power up Indicator by pressing and holding

play the Firmware Revision currently installed in

the unit. Record the number in the block labeled

C. Conﬁ gure the serial port on the indicator

as follows:

1. Press “Shift”

2. Press “Output” repeatedly until the menu

3. Press “Enter”.

4. Press “Output” repeatedly until “9600” is

5. Press “Enter”

6. Press “Output” repeatedly until CRLF (car-

riage return & line) is ﬂ ashing

7. Press “Enter”. The ndicator’s serial port is

now conﬁ gured for 9600 baud communication

with CRLF appended to data packet.

E. Conﬁ gure the com port in the PC Terminal

1. Click on the

2. Click on 9600 Baud, 8 Data Bits, 1 Stop Bit,

Parity None, Flow Control None, select the

minal application is now conﬁ gured to com-

municate with the Indicator in the Remote

Mode.

F. Verify Communication between and PC

1. Type a question mark character and press

0.004469,-0.000227

VERSION 1.0

Page 38

IV. Test Procedure - Verify Remote Command Library

The following library commands must be typed in

terminal and the results veriﬁ ed. This is done by simply

typing the commands exactly as shown, followed by press-

ing the enter key, and comparing the display results to

those listed under each command. Where spaces

required in the command string, they are indicated by

underscore marks (don’t type underscore hit space bar)

A. Battery Check Function

1. BATCK?

2. Response: 6.71 (or similar value)

B. Set/Get Dampening Value

1. DAMP_2

a. Response: OK

2. DAMP?

a. Response: 2

C. Set/Get Engineering Unit Values

1. Type: EUNIT_1,_2

a. Response: OK

2. Type: EUNIT?

a. Response: 1,2

3. Type : EUNIT_0,_0

a. Response: OK

D. Verify engineering unit conversion factors

1. Apply slight pressure to the right sensor and

lock HVC system

2. Type: EUNIT_0

a. Response: OK

3. Observe and record the value displayed for

the right sensor on the

4. Type: EUNIT_1

a. Response: OK

b. The right sensor data is now displayed in

Inches of Water

c. Refer to drawing 822B122 “Conversion

Factors for Units of Pressure”

d. Using the PSI value recorded in step E-3,

ing calculate the inches of water value

e. Assuming they are equivalent, proceed, if

not consult engineering

5. Repeat steps E-3 through E-4-e, substituting

the following values in the “type EUNIT_1

2 (inches HG - psi x 2.03602)

3 (inches water @ 20C: psi x 27.703)

4 (ftSW - psi x 2.2457)

5 (Bar - psi x .0689476)

6 (mBar - psi x 68.9476)

7 (Kpa - psi x 6.89476)

8 (MPa - psi x 68.9476x10-4)

9 (mmHg - psi x 51.7149)

10 (cmWC@ 20C - psi x 70.433)

11 (mmWC - psi x 684.82)

12 (Kg/cm2 - psi x .07030696)

E. Set/Check Hold Value

1. Type: HOLD_1

a. Response: OK (display indicates H)

2. Type: HOLD?

a. Response: 1

3. Type: HOLD_0

a. Response: OK (display H disappears)

F. Set/Check Keylock Value

1. Type: KEYLOCK_1

a. Response: OK

2. Type: KEYLOCK?

a. Response: 1 (keyboard is locked)

3. Type: KEYLOCK0

a. Response: OK (keyboard is unlocked)

G. Check Last error code

1. Type: ABC

a. Response: Err01

2. Type: LASTERR?

a. Response: Err01

3. Type: LASTERR?

a. Response: None

I. Reset/Get MinMax Values

1. Type: MINMAX?

a. Response:

2. Type MINMAX?_0,_0

a. Response:

from step 1)

J. Get/Reset Port Conﬁ guration

1. Type: PORT?

a. Response: 2

2. Type: PORT_0

a. Response: OK (display left port only)

3. Type: PORT?

a. Response: 0

4. Type: PORT_1

a. Response: OK (display right port only)

Page 39

11. Press “Enter”. The serial port is now con-

key.

B. Press “Print” Key

1. Response: ,2 -0.0001 kPa +0.000 PSI

VI. Check Data Packet Contents

A. Conﬁ gure the serial port on the indicator as fol-

lows:

1. Press “Shift”

2. Press “Output” repeatedly until the menu

3. Press “Enter”.

4. Press “Output” repeatedly until “9600” is

5. Press “Enter”

6. Press “Output” repeatedly until CRLF (car-

riage return & line) is ﬂ ashing

7. Press “Enter”. The indicator’s serial port is

now conﬁ gured for 9600 baud communication

with CRLF appended to data packet.

8. Press “Output” repeatedly until “Press+EU”

is ﬂ ashing

9. Press “Enter”

10. Press “Output” repeatedly untill “Man” is

11. Press “Enter”. The serial port is now con-

pressure and engineering unit data

B. Press “Print” Key

1. Response: -0.0001 kPa +0.000 PSI (or

C. Conﬁ gure the serial port on the indicator as fol-

lows:

1. Press “Shift”

2. Press “Output” repeatedly until the menu

3. Press “Enter”.

4. Press “Output” repeatedly until “9600” is

5. Press “Enter”

6. Press “Output” repeatedly until CRLF (car-

riage return & line) is ﬂ ashing

7. Press “Enter”. The indicator’s serial port is

now conﬁ gured for 9600 baud communication

with CRLF appended to data packet.

8. Press “Output” repeatedly until “Pressure” is

9. Press “Enter”

10. Press “Output” repeatedly untill “Man” is

5. Type: PORT?

a. Response: 1

6. Type: PORT_2

a. Response: OK (display both ports)

7. Type: PORT?

a. Response: 2

8. Type: PORT_3

a. Response: OK (display left-right port)

9. Type: PORT?

a. Response: 3

10. Type: PORT_4

a. Response: OK (display right-left port

11. Type: PORT?

a. Response: 4

12. Type: PORT_5

a. Response: OK (display left+right port)

13. Type: PORT_2

K. Get/Set Tare Value

1. Type: TARE?

a. Response: 0,0

2. Type: TARE_1,_1

a. Response: OK (display shows two T’s)

3. Type: TARE?

a. Response: 1,1

4. Type: TARE_0,_0

a. Response: OK (display T’s gone)

5. Type: TARE?

a. Response: 0,0

L. ZERO Ports

1. Type ZERO_1,_1

a. Response: OK

1. Type ZERO_0,_1

a. Response: OK

1. Type ZERO_1,_0

a. Response: OK

V. Verify Print Function

A. Conﬁ gure the serial port on the indicator as follows:

1. Press “Shift”

2. Press “Output” repeatedly until the menu

3. Press “Enter”.

4. Press “Output” repeatedly until “9600” is

5. Press “Enter”

6. Press “Output” repeatedly until CRLF (car-

riage return & line) is ﬂ ashing

7. Press “Enter”. The indicator’s serial port is

now conﬁ gured for 9600 baud communication

with CRLF appended to data packet.

8. Press “Output” repeatedly until “All” is ﬂ ash-

ing

9. Press “Enter”

10. Press “Output” repeatedly untill “Man” is

Page 40

11. Press “Enter”. The serial port is now conﬁ g-

ured to respond to activity on the “Print” key

with only pressure data.

D. Press “Print” Key

1. Response: -0.0002 -0.000 (or similar data)

VII. Verify Output Options

A. Pace Mode

1. Conﬁ gure the serial port on the indicator as

follows:

1. Press “Shift”

2. Press “Output” repeatedly until the menu

3. Press “Enter”.

4. Press “Output” repeatedly until “9600” is

5. Press “Enter”

6. Press “Output” repeatedly until CRLF (car-

riage return & line) is ﬂ ashing

7. Press “Enter”. The indicator’s serial port is

now conﬁ gured for 9600 baud communication

with CRLF appended to data packet.

8. Press “Output” repeatedly until “All” is ﬂ ash-

ing

9. Press “Enter”

10. Press “Output” repeatedly untill “Pace” is

11. Press “Enter”. The serial port is now con-

key.

2. Press the “Enter” key on the computer keyboard

1. Response: ,2 -0.0002 kPa -0.001 PSI (or

A. 1s Mode

1. Conﬁ gure the serial port on the indicator as

follows:

1. Press “Shift”

2. Press “Output” repeatedly until the menu

3. Press “Enter”.

4. Press “Output” repeatedly until “9600” is

5. Press “Enter”

6. Press “Output” repeatedly until CRLF

7. Press “Enter”. The indicator’s serial

port is now conﬁ gured

for 9600 baud communication with

8. Press “Output” repeatedly until “All” is

9. Press “Enter”

10. Press “Output” repeatedly untill “1s” is

11. Press “Enter”. The serial port is now

2. Press the “Enter” key on the computer keyboard

1. Response: ,2 -0.0002 kPa -0.001 PSI

B. 15s Mode

1. Conﬁ gure the serial port on the indicator as

follows:

1. Press “Shift”

2. Press “Output” repeatedly until the menu

3. Press “Enter”.

4. Press “Output” repeatedly until “9600” is

5. Press “Enter”

6. Press “Output” repeatedly until CRLF

7. Press “Enter”. The indicator’s serial port

is now conﬁ gured for 9600 baud com-

munication with CRLF appended to data

packet.

8. Press “Output” repeatedly until “All” is

9. Press “Enter”

10. Press “Output” repeatedly untill “15s”

is ﬂ ashing

11. Press “Enter”. The serial port is now

2. Press the “Enter” key on the computer key-

board

1. Response: ,2 -0.0002 kPa -0.001 PS (or

C. Repeat steps B1 through B2.1 substituting “1m”,

Page 41

CRLF 13 10 0D 0A

CR 13 0D

EOT 4 04

, 44 2C

ETX 3 03

HTAB 9 09

; 59 3B

NULL 0 00

APPENDIX B - END OF MESSAGE CHARACTERS

Weight

from both bays.

–4° to 158°F

Available: ac adapter provided for 220Vac/50 Hz

ac adapter provided for 100Vac/60 Hz

Pack*

vating RS232 results in approximately 30% reduction in battery life.)

Available Ranges

Available Accuracies

Temperature Effect

ture range of 70° ±3°)

–15 to 50 psi

NPT female

British standard

Available Ranges

Available Accuracies

Temperature Effect

APPENDIX C – PRODUCT SPECIFICATIONS

PHYSICAL SPECIFICATIONS

OPERATING SPECIFICATIONS

PRESSURE SENSOR SPECIFICATIONS

Page 42

RTD INTERFACE ASSEMBLY

Accepts TA4F type RTD connector

with 2 pressure sensors installed

(gauge and (gauge/

absolute differential

pressure) 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

0.25*

0.5*

1.0*

2.0*

3.0*

5.0*

10*

15*

25*

50*

ftSW

accessible through

the unit select feature.

able. Consult factory.

±0.125*

±0.25*

±0.5*

±1.0*

±1.5*

±2.5*

±5.0*

±7.5*

±12.5*

±25

±50

±75

±100

NPT female

female with ﬂ ush port

(ranges 10 psi and over)

British standard

British standard with ﬂ ush port

(ranges 10 psi and over)

Welded VCR ﬁ tting with standard

ﬁ nish

This errata sheet describes changes were made to the

These changes were made at Firmware Version 2.04 and

Version 2.03.

All characters received by the unit, when

in Remote protocol, will be echoed back to the host.

After the End Of Message (EOM) sequence is received

by the ﬁ nal EOM sequence.

Version 2.04.

An additional menu is added if Remote

Protocol is selected. The user can select between ‘Terminal

Mode’ or ‘Computer Mode’. In Terminal Mode, the char-

query command will not be echoed and an additional EOM

End of Message Character(s).

The End Of Message (EOM) character sequence is conﬁ g-

ured from the menus when Remote protocol is selected.

Version 2.03.

If the unit is conﬁ gured for the CRLF EOM character

mits a two character sequence CRLF (0Dh 0Ah) at the

STANDARD RANGES

. . .

APPENDIX D – REMOTE COMMUNICATIONS PROTOCOL ERRATA SHEET

Page 43

unit will (correctly) transmit the two character CRLF(0Dh

0Ah) EOM sequence on transmissions to the host.

If the unit is conﬁ gured for any single character EOM

transmit a two character EOM sequence consisting of the

EOM character followed by a NULL, on transmissions to

the host.

If the comma is selected as the EOM character, the unit

will not recognize it as an EOM character since the comma

is recognized (ﬁ rst) as a delimiter character.

The EOM sequences and the resultant receive and transmit

Menu Receive Transmit

EOT 04 04 00

ETX 03 03 00

NULL 00 00 00

The following examples illustrate these characteristics.

host running HyperTerminal. Note that the characters are

The host will transmit: EUNIT 1,2[CR]

The unit will reply:

EUNIT 1,2[CR][CR][LF]OK[CR][LF]

EOM=CRLF, MSG=EUNIT 1,2 Data is shown in Hex.

Host 45 55 4E 49 54 20 31 2C 32 0D

Unit 45 55 4E 49 54 20 31 2C 32 0D 0D 0A

Unit 4F 4B 0D 0A

EOM sequences (CR).

The host will transmit: HOLD?[CR]

The unit will reply:

HOLD?[CR][CR][NULL]0[CR][NULL]

EOM=CR, MSG=HOLD? Data is shown in Hex.

Host 48 4F 4C 44 3F 0D

Unit 48 4F 4C 44 3F 0D 0D 00 30 0D 00

Version 2.04.

The unit will correctly recognize and process, one and two

The EOM sequences and the resultant receive and transmit

Host 48 4F 4C 44 3F 0D

Unit 30 0D

Remote calibration is initiated by holding the PRINT key

is activated, the communications protocol is forced to

Remote-Terminal Mode, regardless of any mode that was

previously selected from the front panel menus.

The terminal (or computer) that is attached to the unit

Baud Rate: 300/600/2400/4800/9600

Data Bits: 8

Stop Bits: 1

Parity: None

Flow control: None

Comm Port: per port being used.

The indicator should be set up as follows:

Baud Rate: 300/600/2400/4800/9600 (must

match terminal rate)

End of Msg: CRLF

Note: Any EOM character

References in the manual to Left Port and Right Port

Page 44

PIN FUNCTION

2 4W+

3 4W–

4 2W–

PIN FUNCTION

2 4W+

3 4W–

4 2W–

Page 45

Page 46

Ashcroft Inc.

250 E. Main Street

Tel: (203) 378-8281