GE Druck DPI 740 User manual

GE
Sensing
Druck DPI 740
Precision Pressure Indicator
User Manual K0200

© The General Electric Company. All rights reserved

K200 Issue No. 1
i DPI 740 User Manual
Safety
The manufacturer has designed this instrument to be safe
when operated using the procedures detailed in this
manual. Do not use this instrument for any other purpose
than that stated.
This publication contains operating and safety
instructions that must be followed for safe operation and
to maintain the instrument in a safe condition. The safety
instructions are either warnings or cautions issued to
protect the user and the equipment from injury or
damage.
Use qualified* personnel and good engineering practice
for all procedures in this publication.
Pressure
Donotapplypressure greaterthanthemaximum safe working
pressure to the instrument.
Toxic Materials
There are no known toxic materials used in this instrument.
Maintenance
The instrument must be maintained using the manufacturer’s
procedures and should be carried out by authorised service
agents or the manufacturer’s service departments.
Technical Advice
For technical advice contact the manufacturer, agent or
subsidiary refer to the list at the rear of this manual.
* A qualified technician must have the necessary technical
knowledge, documentation, special test equipment and tools to carry
out the required work on this equipment.
This product meets the essential protection
requirements of the relevant EEC directives.
Further details of applied standards may be
found in the product specification.

DPI 740 User Manual ii
K200 Issue No. 1
Battery Safety
This instrument is fitted with three size AA batteries either
rechargeable (nickel cadmium) or non-rechargeable (alkaline).
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 corrsion
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.

K200 Issue No. 1
iii DPI 740 User Manual
Abbreviations
The following abbreviations are used in this manual.
Note:
Abbreviations are the same in the singular and plural.
ABS acrylonitrile butadiene styrene
atm atmosphere
BS British standard
cmHg centimetre of mercury
CTS clear to send
DC direct current
DCE data circuit terminating equipment
DTE data terminal equipment
DUCI Druck Universal Communication Interface
ftH2Ofeetofwater
FS full-scale
hPa hecto Pascal
Hz Hertz
ICAO International Civil Aviation Organisation
i/d inside diameter
inHg inch of mercury
inH2Oinchofwater
ISA International standard atmosphere
kg kilogram
kgf/cm2kilogram forceper square centimetre
kgf/m2kilogram forceper square metre
kPa kilo Pascal
lbf/ft2pound force per square foot
LCD liquid crystal display
mA milli Ampere
mbar millibar
mbar a millibar absolute
mm millimetre
mmHg millimetre of mercury
mHg metre of mercury
MPa mega Pascal
mV millivolt

DPI 740 User Manual iv
K200 Issue No. 1
Abbreviations continued
Ni Cad nickel cadmium
o/d outside diameter
Pa Pascal
PCB printed circuit board
ppm parts per million
psi pound per square inch
QFE barometric pressure at airfield level (local)
QFF calculated sea level pressure including air temperature
QNH calculated sea level pressure
RPT resonant pressure transducer
RTS ready to send
RS232 Serial data communication standard
Rx receive
Tx transmit
VVolt
VA Volt amp
CdegreesCelsius
F degrees Fahrenheit
Symbols
The following symbols are used to identify hazards on this
instrument.
Static sensitive components handle with
extreme care.
Thissymbol,on theinstrument, indicates that
the user should refer to the user manual.

K200 Issue No. 1
v DPI 740 User Manual
Table of Contents
title page
1 Introduction .............................. ...............................................1
1.1 Specification.............................. ...............................................2
1.2 Accessories and Options...... ...............................................4
2 Installation................................. ...............................................5
2.1 Battery......................................... ...............................................5
2.2 Electrical Connections........... ...............................................6
2.3 Initial Settings............................ ...............................................10
3 Operation ................................... ...............................................11
3.1 General........................................ ...............................................11
3.2 Measurement Modes............. ...............................................11
Local (QFE) Measurement.... ...............................................13
Sea Level (QFF) Measurement ..........................................14
Altitude Measurement........... ...............................................16
Processing Measurements.. ...............................................18
Tare ............................................... ...............................................18
Filter .............................................. ...............................................18
Max/Min ...................................... ...............................................21
3.3 Set-up Menu.............................. ...............................................25
Battery......................................... ...............................................26
Units.............................................. ...............................................26
Time-out...................................... ...............................................28
Serial Communications........ ...............................................29
Entering a new PIN................. ...............................................31
Sending Measurements to a Printer or PC .................32
4 Calibration.................................. ...............................................33
Calibration Check.................... ...............................................33
5 Maintenance............................. ...............................................37
5.1 General........................................ ...............................................37
5.2 Fault finding............................... ...............................................37
5.3 Cleaning...................................... ...............................................37

DPI 740 User Manual vi
K200 Issue No. 1
Table of Contents (contd)
title page
6 Communications...................... .............................................. 39
6.1 Introduction................................ .............................................. 39
6.2 General Command Format. .............................................. 40
6.3 Command Summary.............. .............................................. 43
6.4 Command Set........................... .............................................. 45
Input Commands..................... .............................................. 45
Process Commands............... .............................................. 47
Set-up Commands.................. .............................................. 50
Calibration Commands......... .............................................. 51
Automatic Commands.......... .............................................. 55
Read Commands..................... .............................................. 56
Protocol Format Commands............................................ 58
Key Commands........................ .............................................. 59
Approved Service Agents...................... .............................................. 64
Table of Illustrations
fig. title page
1-1 General view.............................. .............................................. 1
2-1 Fitting the battery.................... .............................................. 6
2-2 Electrical connections........... .............................................. 8
2-3 Adaptor/charger connector 9
3-1 Instrument front panel.......... .............................................. 11
3-2 Measurement mode menu. .............................................. 12
3-3 Local pressure measurement ........................................ 13
3-4 Sea level measurement........ .............................................. 14
3-5 Altitude measurement.......... .............................................. 16
3-6 Process sub-menu.................. .............................................. 19
3-7 Max/Min menu.......................... .............................................. 22
3-8 Set-up menu.............................. .............................................. 25
3-9 Communications set-up....... .............................................. 30
3-10 Calibration................................... .............................................. 35

DPI 740 User Manual 1
K0200 Issue No. 1
1 Introduction
The Druck 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 moulded 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

K0200 Issue No. 1
2 D P I 7 4 0 U s e r M a n u a l
1.1 Specification
Dimensions
Weight: (nominal).................................................................. ..................0.5 kg
Size: height = 190 mm width = 90 mm, depth = 36 mm
Environmental
Temperature:
Operating.......................... ........ ......... ......... -10 to +50
 C
Storage ......................................................... ......... -40 to +70
 C
Pressure medium: ................ Any gas compatible with pyrex,
.................. .................. silicon, stainless steel and epoxy resin
Sealing standard................................................................... ..................IP54
Pressure
Connector...................................................... ......... 6 mm o/d
or.................................................... ......... 4 mm i/d hose fitting
Accuracy
Non-linearity, hysteresis and repeatability:
over the range of 10°to 30°C
........................................................................... ......... ±0.02 % FS
over the range of 0° to 40°C
........................................................................... ......... ±0.03 % FS
over the range of -10° to 50°C
........................................................................... .........±0.045 % FS
Stability .................................................................. ........ <100 ppm/year
Range (barometric)............................................ ........ 750 to 1150 mbar a
alternative ranges:
.................................................................. ........ 35 to 1300 mbar a
.................................................................. ........ 35 to 2600 mbar a
.................................................................. ........ 35 to 3500 mbar a
Maximum safe working pressure........................ ......... 4375 mbar a
Display
Read-out................................... .........999999 LCD digits, 13.6mm high
.................. .................. with additional 16 text characters
Overload indication
Error code flashing................. .........at nominal 110% FS
Response............................................ ........ nominal 2 readings/second
Resolution 0.01 mbar (e.g., 1013.25 mbar a)