Omega Products DPI 740 Installation Manual

DPI 740

Precision Pressure Indicator

User Manual

M-2912

@ Omege Engineering, Inc. This document is the property of Omega Engineering, Inc and maynot, either in part

orwhole, be copied or otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing System, without the express written authority of Omega Engineering, Inc

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Battery Safety This instrument is fitted with three size AA batteries either rechargeable (nickel cadmium) or non-rechargeable (alkaline).

DPI 740 User Manual

Before storing this instrument remove the batteries

When fitting batteries make sure the electrical contacts are clean and observe the correct polarity.

The battery compartment should be inspected for corrosion caused by leaking batteries. Corrosion must be removed using approved methods*.

When storing and transporting batteries make sure that they cannot be short circuited. A short circuited battery can become very hot and can, in certain circumstances, explode. It is recommended that a suitable container is used for storing and transporting batteries.

Dispose of old batteries using a safe, approved method.*

*Refer to the Battery Manufacturer for this information.

Software Version This manual contains operating instructions for instruments with software version 1.XX. Further changes to the instrument's software may require a change to the operating instructions and an issue number change of the manual.

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Abbreviations continued

DPI 740 User Manual

PCB ppm

psi OFE

OFF

ONH RPT RTS RS232

Rx Tx V VA oC of

printed circuit board parts per million pound per square inch barometric pressure at airfield level (local) calculated sea level pressure including air

temperature calculated sea level pressure

resonant pressure transducer ready to send Serial data communication standard

receive transmit Volt Volt amp degrees Celsius degrees Fahrenheit

Symbols

The following symbols are used to identify hazards on this instrument.

Static sensitive components handle with

extreme care.

This symbol, on the instrument, indicates that the user should refer to the user manual.

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Table of Contents (contd)

title

6 Communications ..." " , "' , "'.."

6.1 Introduction , "'..." ,.,..." " "..."".."

6,2 General Command Format .." , " "'.

6,3 Command Summary "' "..."' ,,...""..""

6.4 Command Set "...""..""..."' ' " "' '

Input Commands ""..."' "' , " " ,.

Process Commands , ", " " , , Set-up Commands ."...""..."' " " " '

Calibration ComrtJands .." " " " "..

Automatic Commands , " "'..." "..."..

Read Commands ..."'..."".."' "'..."'..." '

Protocol Format Commands ,..." ,,'..." ,

Key Commands .." "'..." "'..."' "..."

DPI 740 User Manual

Table of Illustrations

fig. title

1-1 General view 2-1 Fitting the battery 2-2 Electrical connections 2-3 Adaptor/charger connector 3-1 Instrument front 'panel 3-2 Measurement mode menu 3-3 Local pressure measurement

3-4 Sea level measurement 3-5 Altitude measurement 3-6 Process sub-menu 3-7 MaxiMin menu 3-8 Set-up menu 3-9 Communications set-up 3-10 Calibration

page

...39 ...39 ...40 ...42 ...44 ...44 ...46 ...49 ...50 ...54 ...55 ...57 ...58

page

1 6 8 9

11 12 13 14 16

19 22 25 30 34

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DPI 740 User Manual

1 Introduction

The Omega DPI 740 precision pressure indicator uses a

silicon resonant pressure transducer producing a pressure reading in units of pressure measurement and altitude.

The instrument is contained in a molded enclosure of a

composite ABS material and can be used as a hand-held indicator or. using a retractable stand. as a bench instrument. The instrument can also communicate. through a serial RS232 connector. with a compatible computer system or printer.

Figure 1-1 General view

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DPI 740 User Manual

Specification (contd)

Display

Read-out 999999 LCD digits, 0.535' (13.6 mm) high

with additional 16 text characters

Overload indication

Error code flashing

Response

at nominal11 0% FS

nominal 2 readings/second

Resolution

Electrical Power Supply

0.001 inHg (e.g., 1.034 inHg a)

Batteries

Connections

external power adaptor/charger

RS232 serial communications Electrical safety This instrument meets:

""""""""""" BS EN 61010 as applicable

Electromagnetic compatibility This instrument meets"

3 x 1.5 V alkaline size AA

.International power jack

6-way LEMO type

..EN50081-1 (emissions) ...EN50082-1 (immunity) rJes necessitatesContinuing development some

specification changes.

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DPI 740 User Manual 5

2 Installation

WARNING: DO NOT ATTEMPT TO CHARGE NON-RECHARGEABLE BATTERIES. TO PREVENT ACCIDENTAL CHARGING OF NONRECHARGEABLE BATTERIES THE CHARGE LINK LK2 MUST BE IN THE DISABLED POSITION (X).

CAUTION: Do NOT LEAVE OISCHARGEO BATTERIES IN THE INSTRUMENT.

OLD BATTERIES CAN LEAK AND CAUSE CORROSION. WHEN FITTING THE BATTERIES MAKE SURE THE ELECTRICAL

CONTACTS ARE CLEAN AND OBSERVE THE CORRECT POLARnY. N!lJ#-: For further information. refer to the safety page

at the front of this manual and to the battery manufacturer.

2.1 Battery (Figure 2-1)

Three batteries are fitted in the battery compartment.

For non rechargeable batteries make sure the charging link LK2 is fitted in the disabled positibn (X).

For rechargeable batteries make sure the charging link LK2 is fitted in the enabled position (,1).

N!lJ#-: The charging link LK2 is located on the

instrument PCB. To access th,s link remove the

top case assembly.

To replace the batteries, unscrew the captive screw and slide off the battery compartment cover. Make sure the polarity of the new batteries is correct.

If the battery capacity is low the display shows:

" The battery symbol (approximately 1 hour left). " The flashing message Battery Very Low for 15 to 20

minutes.

" The message Batteries Dead! followed, after a short

time, Switching Off!! the instrument then automatically switches off

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DPI 740 User Manual R$232 connections

Option C is the adaptor cable recommended for use with the

RS232 serial communication interface. The adaptor cable

has, at one end, 6-pin LEMO type connector and, at the other, a 9-way D type connector. The instrument's serial communication settings and the data terminal equipment (DTE) settings must be the same. The recommended initial settings are as follows:

Baud rate 9600 Data bits 8 Stop bits 1 Parity none Handshaking none

Adaptor Cable

Pin No. Function

1 RxD input f- 2 CTS input f- 3 GND (screen) H

I Flow I Function I Pin No. -1-Pin No.

TxD

RTS GND

4 not used 5 RTS output -t 6 TxD output -t

CTS RxD

,. The function column for the D type connector uses

RS232 terminology with respect to DTE.

2. In the D-type connector DTR and DSR should be connected together as follows:

9-way pin 4 and 6 25-way pin 20 and 6

3. The instrument's sen81 communication settings can

be changed using the set-up menu.

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DPI 740 User Manual

Figure 2-3 Adaptor/charger connector

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DPI 740 User Manual

3 Operation

3.1 General (Figure 3-1)

The instrument is switched on by the ON/OFF push-button and powers up in the last selected mode and units of measurement. The instrument "times-out" after a period of one minute if no push-button selections are made. To keep the instrument in the powered-up state the ON/OFF and MODE push-buttons should be pressed together. The display briefly shows a "Time-out Disabled' message. Pressing the MODE push-button steps through the three pressure measurement modes. Pressing the SET push-button steps

through the set-up menu (described in 3.3).

3.2 Measurement Modes (Figure 3-1)

Selecting the MODE push-button, changes the measurement mode between:

Local (OFE unprocessed pressure at the pressure port). Sea (OFF calculated pressure at sea level). Altitude (calculated height from pressure datum).

Selecting the push-button F2 changes the units of pressure measurement, continuous pressing steps between three pre-

selected units, the display shows the units for each measurement mode.

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Figure 3-1 Instrument front panel

::=-0 ~status line F1 SET \J--- function

9 ~ Set-up menus

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DPI 740 User Manual

Local (QFE) Measurement (Figure 3-3)

This is the direct measurement of the absolute pressure sensed at the pressure port. In addition to measuring local pressure the instrument can, with the use of a hose and a connector, measure absolute pressure at a system test point.

measurement mode pressing F1 changes

to tare (T)

Figure 3-3 Local pressure measurement

units of measurement press F2 to change

between three units.

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