DH Instruments RPM3 - VERSION 2002 User manual

© 1998-2002 DH Instruments, Inc.
RPM3™
Reference Pressure Monitor
Operation and Maintenance Manual

© 1998-2002 DH Instruments, Inc.
High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases
can be released unexpectedly and with extreme force. High pressure systems should be assembled
and operated only by personnel who have been instructed in proper safety practices.
© 1998-2002 DH Instruments, Inc. All rights reserved.
Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any
form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, Inc.
4765 East Beautiful Lane Phoenix AZ 85044-5318 USA.
DH Instruments makes sincere efforts to ensure accuracy and quality of its’ published materials; however, no warranty, expressed
or implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or indirect damages resulting from the
use of the information in this manual or products described in it. Mention of any product or brand does not constitute an
endorsement by DH Instruments of that product or brand. This manual was originally composed in English and was subsequently
translated into other languages. The fidelity of the translation cannot be guaranteed. In case of conflict between the English version
and other language versions, the English version predominates.
Products described in this manual are manufactured under international patents and one or more of the following U.S. patents:
5,142,483, 5,257,640, 5,331,838, 5,445,035. Other U.S. and international patents pending.
DH Instruments, DH, DHI, AutoZ, COMPASS, CalTool, PPC, PPC2+, RPM3 and SDS (Self Defense System) are trademarks,
registered and otherwise, of DH Instruments, Inc.
LabVIEW is a registered trademark of National Instruments Corporation.
Document No. 550094f-01
020909
Printed in the USA.

TABLE OF CONTENTS
Page I © 1998-2002 DH Instruments, Inc.
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TABLE OF CONTENTS ...............................................................I
TABLES .................................................................................IV
FIGURES.................................................................................V
ABOUT THIS MANUAL .............................................................VI
1. INTRODUCTION ................................................................. 1
1.1 PRODUCT OVERVIEW ...........................................................................................................................1
1.2 SPECIFICATIONS ...................................................................................................................................1
1.2.1 GENERAL SPECIFICATIONS .......................................................................................................................1
1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS........................................................................................2
1.2.2.1 STANDARD REFERENCE PRESSURE TRANSDUCER (RPT) ...............................................................3
1.2.2.2 B TYPE REFERENCE PRESSURE TRANSDUCER (RPT) ......................................................................4
1.2.2.3 ON-BOARD BAROMETER ........................................................................................................................4
1.2.3 CONFIGURATIONS.......................................................................................................................................5
1.2.3.1 ONE OR TWO RPTS: GROUP 1 (< A1500) .............................................................................................6
1.2.3.2 TWO RPTS: ONE GROUP 1 (> A1500) AND ONE GROUP 2 (> A1500 AND < A10000) OR ONE
LIQUID FILLED GROUP 1 .........................................................................................................................7
1.2.3.3 TWO RPTS: BOTH GROUP 2 (> A1500 AND < A10000) OR LIQUID FILLED GROUP 1.......................8
1.2.3.4 ONE RPT: GROUP 2 (> A1500 AND > A10000) OR GROUP 3 (> A10000) OR LIQUID FILLED
GROUP 1 ...................................................................................................................................................9
2. INSTALLATION ................................................................ 11
2.1 UNPACKING AND INSPECTION ..........................................................................................................11
2.1.1 REMOVING FROM PACKAGING................................................................................................................11
2.1.2 INSPECTING CONTENTS...........................................................................................................................11
2.2 SITE REQUIREMENTS..........................................................................................................................11
2.3 INITIAL SETUP......................................................................................................................................12
2.3.1 PREPARING FOR OPERATION .................................................................................................................12
2.3.2 FRONT AND REAR PANELS......................................................................................................................12
2.3.2.1 FRONT PANEL ........................................................................................................................................12
2.3.2.2 REAR PANEL...........................................................................................................................................13
2.3.3 POWER CONNECTION...............................................................................................................................13
2.3.4 TEST PORT CONNECTING ........................................................................................................................13
2.3.4.1 THE ATM AND VENT PORTS .................................................................................................................14
2.4 POWER UP AND VERIFICATION .........................................................................................................15
2.4.1 APPLY POWER ...........................................................................................................................................15
2.4.2 CHECK PROPER PRESSURE MEASUREMENT OPERATION ................................................................15
2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT.............................................................15
2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT...................................................................16
2.5 SHORT TERM STORAGE .....................................................................................................................16
3. OPERATION..................................................................... 17
3.1 GENERAL/MANUAL OPERATION .......................................................................................................17
3.1.1 MAIN RUN SCREEN....................................................................................................................................17
3.1.2 GENERAL OPERATING PRINCIPLES .......................................................................................................18
3.1.2.1 KEYPAD LAYOUT AND PROTOCOL......................................................................................................18
3.1.2.2 SOUNDS ..................................................................................................................................................18
3.1.2.3 SOFT [ON/OFF] KEY ...............................................................................................................................19
3.1.2.4 PRESSURE READY <*>/NOT READY (<↑> OR <↓>)...........................................................................19
3.1.2.5 MULTIPLE PRESSURE RANGES...........................................................................................................19
3.1.2.6 SDS SELF DEFENSE SYSTEM ..............................................................................................................20

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page II
3.1.2.7 DIRECT FUNCTION KEYS SUMMARY...................................................................................................21
3.2 3.2 DIRECT FUNCTION KEYS..............................................................................................................22
3.2.1 3.2.1 [RANGE] .............................................................................................................................................22
3.2.2 [UNIT]...........................................................................................................................................................24
3.2.3 [MODE] ........................................................................................................................................................25
3.2.4 [UL] (UPPER LIMIT) ....................................................................................................................................26
3.2.4.1 OVER-PRESSURE FUNCTION (PMAX!) ................................................................................................27
3.2.5 [RES] (RESOLUTION).................................................................................................................................28
3.2.6 [DISPLAY]....................................................................................................................................................29
3.2.6.1 AVG (AVERAGE) .....................................................................................................................................30
3.2.6.2 RATE........................................................................................................................................................31
3.2.6.3 DEV (DEVIATION) ...................................................................................................................................32
3.2.6.4 RPT ..........................................................................................................................................................33
3.2.6.5 HI/LO ........................................................................................................................................................34
3.2.6.6 FREEZE ...................................................................................................................................................35
3.2.6.7 CLEAN .....................................................................................................................................................35
3.2.7 [HEAD] .........................................................................................................................................................36
3.2.8 [SDS] (SELF DEFENSE SYSTEM) .............................................................................................................37
3.2.9 [AUTOZ].......................................................................................................................................................40
3.2.9.1 RUNNING AUTOZ IN GAUGE MEASUREMENT MODE ........................................................................40
3.2.9.2 RUNNING AUTOZ IN ABSOLUTE MEASUREMENT MODE ..................................................................41
3.3 [SETUP] MENU KEY .............................................................................................................................45
3.3.1 HEAD ...........................................................................................................................................................45
3.3.2 PRESU .........................................................................................................................................................46
3.3.3 READRT (READ RATE)...............................................................................................................................47
3.3.4 STAB (STABILITY) ......................................................................................................................................48
3.3.5 LEAK (LEAK CHECK) .................................................................................................................................48
3.4 [SPECIAL] MENU KEY..........................................................................................................................50
3.4.1 AUTOZ .........................................................................................................................................................51
3.4.1.1 AUTOZ ON/OFF.......................................................................................................................................53
3.4.1.2 VIEW AUTOZ ...........................................................................................................................................54
3.4.1.3 EDIT AUTOZ ............................................................................................................................................54
3.4.2 SDS ..............................................................................................................................................................55
3.4.3 ATM..............................................................................................................................................................56
3.4.4 REMOTE ......................................................................................................................................................56
3.4.5 RESET..........................................................................................................................................................57
3.4.5.1 RESET - SETS.........................................................................................................................................58
3.4.5.2 RESET - UNITS........................................................................................................................................58
3.4.5.3 RESET - COM..........................................................................................................................................58
3.4.5.4 RESET - CAL ...........................................................................................................................................59
3.4.5.5 RESET - ALL............................................................................................................................................59
3.4.6 CAL ..............................................................................................................................................................59
3.4.7 INTERN ........................................................................................................................................................59
3.4.7.1 SCRSAV...................................................................................................................................................60
3.4.7.2 SOUND.....................................................................................................................................................60
3.4.7.3 TIME.........................................................................................................................................................60
3.4.7.4 ID..............................................................................................................................................................61
3.4.8 LEVEL..........................................................................................................................................................62
3.4.9 LOG..............................................................................................................................................................64
4. REMOTE OPERATION ....................................................... 65
4.1 OVERVIEW............................................................................................................................................65
4.2 INTERFACING.......................................................................................................................................65
4.2.1 4.2.1 RS-232 INTERFACE...........................................................................................................................65
4.2.1.1 4.2.1.1 COM1 ...........................................................................................................................................65
4.2.1.2 COM2 .......................................................................................................................................................66
4.2.2 IEEE-488 (GPIB)..........................................................................................................................................66
4.3 REMOTE COMMAND SYNTAX AND STYLE .......................................................................................66
4.3.1 LOCAL AND REMOTE SETTING................................................................................................................66
4.3.2 COMMAND SYNTAX ...................................................................................................................................66
4.3.3 QUERIES AND REPLIES ............................................................................................................................67
4.3.4 MULTIPLE COMMANDS .............................................................................................................................67
4.3.5 COMMAND PARAMETERS.........................................................................................................................67
4.3.6 SUFFIXES....................................................................................................................................................68
4.3.7 PROGRAMMING TIPS.................................................................................................................................68
4.3.7.1 SCPI AND IEEE-488.2 .............................................................................................................................68
4.3.7.2 PROGRAM TECHNIQUE.........................................................................................................................68
4.4 COMMANDS..........................................................................................................................................72
4.4.1 ERROR MESSAGES 75

TABLE OF CONTENTS
Page III © 1998-2002 DH Instruments, Inc.
4.4.2 COMMAND DESCRIPTIONS.......................................................................................................................76
4.4.2.1 IEEE STD. 488.2 COMMON AND STATUS COMMANDS ......................................................................76
4.4.2.2 MEASUREMENT SUBSYSTEM ..............................................................................................................78
4.4.2.3 CALCULATE SUBSYSTEM .....................................................................................................................81
4.4.2.4 CALIBRATION SUBSYSTEM ..................................................................................................................82
4.4.2.5 DISPLAY SUBSYSTEM ...........................................................................................................................84
4.4.2.6 SENSE SUBSYSTEM ..............................................................................................................................84
4.4.2.7 STATUS SUBSYSTEM ............................................................................................................................86
4.4.2.8 SYSTEM SUBSYSTEM............................................................................................................................90
4.4.2.9 UNIT SUBSYSTEM..................................................................................................................................94
4.5 STATUS SYSTEM .................................................................................................................................96
4.5.1 STATUS REPORTING SYSTEM .................................................................................................................96
4.5.1.1 SCPI STATUS SUBSYSTEM...................................................................................................................96
4.5.1.2 ERROR QUEUE.......................................................................................................................................96
4.5.1.3 STATUS BYTE REGISTER......................................................................................................................97
4.5.1.4 STANDARD EVENT REGISTER .............................................................................................................98
4.5.1.5 RPT READY STATUS REGISTER ..........................................................................................................99
4.5.2 STATUS SUBSYSTEM..............................................................................................................................100
4.5.2.1 OPERATION REGISTER STRUCTURE................................................................................................100
4.5.2.2 QUESTIONABLE REGISTER STRUCTURE .........................................................................................103
5. MAINTENACE, ADJUSTMENTS AND CALIBRATION .............107
5.1 INTRODUCTION..................................................................................................................................107
5.2 CALIBRATION OF REFERENCE PRESSURE TRANSDUCERS.......................................................107
5.2.1 PRINCIPLE ................................................................................................................................................107
5.2.1.1 PA/PM COEFFICIENTS.........................................................................................................................108
5.2.1.2 SETTING ZNATERR..............................................................................................................................108
5.2.1.3 ORDER OF OPERATIONS ....................................................................................................................109
5.2.2 EQUIPMENT REQUIRED ..........................................................................................................................109
5.2.3 SET-UP AND PREPARATION...................................................................................................................110
5.2.4 RPT CALIBRATION USING CALTOOL FOR RPTS SOFTWARE............................................................111
5.2.5 EDITING AND VIEWING RPT CALIBRATION INFORMATION................................................................111
5.2.6 SETTING ZNATERR..................................................................................................................................112
5.2.7 RPT CALIBRATION/ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE.............................113
5.3 ADJUSTMENT OF ON-BOARD BAROMETER...................................................................................114
5.4 OVERHAUL .........................................................................................................................................114
5.5 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY......................................................115
5.6 SUBASSEMBLY DESCRIPTION AND LOCATION ............................................................................116
5.6.1 INTERNAL VIEW .......................................................................................................................................116
5.6.1.1 SDS MODULE........................................................................................................................................116
5.6.1.2 RPTS......................................................................................................................................................117
5.6.1.3 POWER SUPPLY...................................................................................................................................117
5.6.1.4 COOLING FAN.......................................................................................................................................117
5.6.1.5 MICRO BOARD......................................................................................................................................117
5.6.1.6 MAIN BOARD.........................................................................................................................................117
5.6.1.7 ON-BOARD BAROMETER ....................................................................................................................117
5.6.1.8 DISPLAY ................................................................................................................................................117
6. TROUBLESHOOTING .......................................................119
6.1 OVERVIEW..........................................................................................................................................119
7. APPENDIX ......................................................................123
7.1 PRESSURE UNIT CONVERSIONS.....................................................................................................123
7.2 WARRANTY STATEMENT..................................................................................................................124
8. GLOSSARY.....................................................................125

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page IV
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Table 1 Standard RPT Designations and Ranges....................................................................................... 3
Table 2 b Type RPT Designations and Ranges .......................................................................................... 4
Table 3 RPM3 Configurations...................................................................................................................... 5
Table 4 One or Two RPTs: Group 1 (> A1500) Specifications................................................................... 6
Table 5 Two RPTs: One Group 1 (> A1500) and One Group 2 (> A1500 and < A10000)
or One Liquid Filled Group 1 Specifications.............................................................................. 7
Table 6 Two RPTs: Both Group 2 (> A1500 and < A10000) or Liquid Filled Group 1 Specifications........ 8
Table 7 One RPT: Group 2 (> A1500 and < A10000) or Group 3 (> A10000) or
Liquid Filled Group 1 Specifications .......................................................................................... 9
Table 8 RPM3 Parts List ............................................................................................................................ 11
Table 9. RPM3 Range Identification Summary.......................................................................................... 20
Table 10 Summary of RPM3 Direct Function Key Operation .................................................................... 22
Table 11 PresU - Available Units ............................................................................................................... 46
Table 12 READRT - Display Update Rates ............................................................................................... 47
Table 13. Functions - Security Levels........................................................................................................ 63
Table 14 RPM3 COM1 DB-9F Pin Designations ....................................................................................... 65
Table 15 IBM PC/XT DB-9F, DB-9M Connections ....................................................................................65
Table 16 RPM3 COM2 DB-9M Pin Designations ......................................................................................66
Table 17 Quick Tips ................................................................................................................................... 71
Table 18 Command Summary ................................................................................................................... 72
Table 19 “SYSTEM:ERROR?” QUERY REPLY ........................................................................................ 75
Table 20 8 Bit Status Byte Register ........................................................................................................... 97
Table 21 Standard Event Register............................................................................................................. 98
Table 22 8 Bit RPT Ready Status Register ............................................................................................... 99
Table 23. RPM3 Troubleshooting Symptom / Probable Cause / Solution List ........................................ 119
Table 24 Pa Conversions......................................................................................................................... 123
Table 25. DHI Authorized Service Providers ........................................................................................... 124

FIGURES & TABLES
Page V © 1998-2002 DH Instruments, Inc.
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Figure 1 Rear Panel (Left) One or Two Group 1 RPTs (Right) One or Two Group 1 RPTs with
a GXXXX RPT ........................................................................................................................... 6
Figure 2 Schematic (Left) Two Group 1 RPTs (Right) One Group 1 RPT .................................................. 6
Figure 3 Rear Panel (Left) One Group 1 RPT and One Group 2 RPT (Right) One Group 1
GXXXX RPT and One Group 2 RPT......................................................................................... 7
Figure 4 Schematic One Group 1 RPT and One Group 2 RPT................................................................... 7
Figure 5 Two Group 2 RPTs (Left) Rear Panel / (Right) Schematic .......................................................... 8
Figure 6 Rear Panel (Left) One Group 2 RPT (Right) One Group 3 RPT ................................................... 9
Figure 7 Schematic (Left) One Group 2 RPT (Right) One Group 3 RPT .................................................... 9
Figure 8. Front Panel ................................................................................................................................. 12
Figure 9. Test Ports.................................................................................................................................... 13
Figure 10 Keypad....................................................................................................................................... 18
Figure 11 SDS Schematic.......................................................................................................................... 21
Figure 12 Status Byte Register .................................................................................................................. 97
Figure 13 Illustration of this Structure Duplicated for Each of the OPERation, INSTrument,
and ISUMmary Registers ...................................................................................................... 101
Figure 14 Relationship of the OPERation Register and Its Support Registers ....................................... 102
Figure 15 Illustration of this Structure Duplicated for Each of the OPERation, INSTrument,
and ISUMmary Registers ...................................................................................................... 104
Figure 16 Relationship of the QUEStionable Registers and Its Support Registers................................. 105
Figure 17 RPM3 Internal View ................................................................................................................. 116

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page VI
A
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AN NU UA AL L
This manual provides the user with the basic information necessary to operate an RPM3, Reference
Pressure Monitor. It also includes a great deal of additional information provided to help you optimize
RPM3 use and take full advantage of its many features and functions.
Before using the manual, take a moment to familiarize yourself with the Table of Contents structure. All first
time RPM3 users should read Sections 1, 2 and 3. Section 3 provides a comprehensive description of
general RPM3 operating principles. Section 4 is for remote operation from an external computer.
Section 5 provides maintenance and calibration information. Section 6 is a quick troubleshooting guide.
Use it to troubleshoot unexpected RPM3 behavior based on the symptoms of that behavior.
Certain words and expressions have specific meaning as they pertain to RPM3. The Glossary is useful
as a quick reference for exact definition of specific words and expressions as they are used in this
manual.
FOR THOSE OF YOU WHO “DON’T READ MANUALS”, GO DIRECTLY TO SECTION 2.3 TO SET UP YOUR
RPM3 AND THEN SECTION 2.4 FOR POWER UP AND VERIFICATION. THIS WILL GET YOU RUNNING
QUICKLY WITH MINIMAL RISK OF CAUSING DAMAGE TO YOURSELF OR YOUR NEW RPM3. THEN…
WHEN YOU HAVE QUESTIONS OR START TO WONDER ABOUT ALL THE GREAT FEATURES YOU MIGHT
BE MISSING, GET INTO THE MANUAL!
Manual Conventions
(CAUTION) is used in throughout the manual to identify user warnings and cautions.
(NOTE) is used throughout the manual to identify operating and applications advice and
additional explanations.
[ ] indicates direct function keys (e.g., [RANGE]).
< > indicates PG7000 screen displays (e.g., <1yes>).

1. INTRODUCTION
Page 1 © 1998-2002 DH Instruments, Inc.
1
1. . I IN
NT TR RO OD DU UC CT TI IO ON N
1.1 PRODUCT OVERVIEW
RPM3 is a stand-alone, microprocessor driven, reference pressure monitor intended to accurately
measure gas or liquid pressure in a wide variety of pressure calibration, measurement and testing
applications. It has been designed to provide very high performance and extensive features combined
with maximum versatility and ease of use.
RPM3 uses one or two high accuracy reference pressure transducers (RPTs) and an on-board barometer
to measure pressure. Various internal configurations exist depending on the RPT ranges.
RPM3 can be controlled locally by the operator using its front panel display and keypad or remotely by a
computer using ASCII character command strings over its RS-232 and IEEE-488 interfaces.
RPM3 models are available to measure pressure in ranges from 0.6 psi (4 kPa) to 40 000 psi (275 MPa)
in gauge, compound and absolute measurement modes.
1.2 SPECIFICATIONS
1.2.1 GENERAL SPECIFICATIONS
Specifications below are specific to PG7307. All other specifications are identical to PG7000
specifications found in the PG7000 Operation and Maintenance Manual (P/N 550099).
Power Requirements 85 to 264 VAC, 47 to 440 Hz, 18 VA max. consumption
Operating Temperature Range 15 to 35 °C
Storage Temperature Range -20 to 70 °C
Vibration Meets MIL-T-28800D
Weight 3.5 kg (7.7 lb) max depending on RPT configuration
Dimensions 8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.) approx.
Microprocessors Motorola 68302
Communication Ports RS-232 (COM1), RS-232 (COM2), IEEE-488
Overall Pressure Ranges Up to six pressure ranges from 0 to 0.6 psi (4 kPa) to 0 to 40 000 psi
(275 MPa), absolute, gauge and negative gauge, using one or two
reference pressure transducers and a barometer
Operating Media Any non-corrosive gas or liquid (liquid available only on A0100 or
higher RPTs). RPTs < 10 000 psi (70 MPa) delivered set up for gas
operation, RPTs > 10 000 psi delivered oil filled.

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page 2
Pressure Connections Test port (RPT ≤10 000 psi): 1/8 in. NPT F
Test port (RPT > 10 000 psi): DH500 (gland and collar type for
coned and left hand threaded
tube, equivalent to AE F250C,
HIP HF4, etc.)
Test (-): 1/8 in. NPT F (with gauge RPT
only)
ATM Ref (On-board barometer): 10-32 UNF
Vent (with SDS only): 10-32 UNF
Pressure Limits Maximum working pressure: Range 3 of active RPT+ 4 %
Maximum pressure w/o damage: Standard RPT: 125 % of H3
b Type RPT: 150 % of H3
Maximum pressure applied to
SDS protected TEST port
when SDS is active: 2 000 psi (13 MPa)
Self Defense System (SDS™) Included on all gas operated RPTs of 1 500 psi (10 MPa) or lower.
Isolates RPT from TEST port and vents it to atmosphere when NOT
in use. SDS is NOT included with liquid filled RPTs.
Maximum SDS isolation pressure: 2 000 psi (13 MPa)
CE Conformance Available. Must be specified.
1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS
RPM3 can be configured with one or two reference pressure transducers (RPT). Each
transducer has three ranges (see Section 3.1.2.5). The type and designation of the RPM3’s
RPTs determine its measurement specifications and configuration (see Sections 1.2.2 and
1.2.3). Two types of RPTs are available. Standard RPTs are for the highest measurement
specifications and b Type RPTs for lower measurement performance requirements.
All reference pressure transducers (RPTs) with designation greater than G0030 (200 kPa)
are of the absolute pressure type with an evacuated, permanently sealed reference. Absolute
RPTs can measure both absolute and gauge pressure. Gauge pressures with an absolute
RPT are defined by offsetting atmospheric pressure dynamically with compensation for
atmospheric changes by the on-board barometer. Gauge RPTs cannot measure absolute
pressure.

1. INTRODUCTION
Page 3 © 1998-2002 DH Instruments, Inc.
1.2.2.1 STANDARD REFERENCE PRESSURE TRANSDUCER (RPT)
Table 1 Standard RPT Designations and Ranges
Standard RPT Measurement Specifications (% FS of Active Range)
Transducer Type Oscillating quartz resonator
Warm Up Time ≤1 500 psi 15 minutes
Resolution To 1 ppm, user settable by individual range
Overpressure Limits
Without effect on calibration
Without permanent damage
115 % of Range 3
125 % of Range 3
Temperature Effect Fully compensated with active independent temperature
measurement from -20 to 100 °C
± 0.005 % maximum temperature effect in normal ambient operating
range of 15 to 35 °C
Attitude Affect ± 0.008 % /g maximum, worst axis
Precision1≤1 500 psi 0.005 %, > 10 500 and ≤20 000 psi 0.010 %,
> 20 000 psi 0.015 %
Predicted Stability2
Gauge Mode (w/Autozero)
Absolute Mode (w/Autozero)
Absolute Mode (w/out Autozero)
All Ranges
90 day / 1 yr
0.003 % / 0.009 %
0.003 % / 0.009 %
0.006 % / 0.0015 %
Measurement Accuracy3
Gauge Mode (w/Autozero)
Absolute Mode (w/Autozero)
Absolute Mode (w/out Autozero)
≤1 500 psi
90 day / 1 yr
0.008 / 0.012 %
0.008 / 0.012 %
0.010 / 0.017 %
> 1 500 ≤20 000 psi
90 day / 1 yr
0.012 / 0.015 %
0.012 / 0.015 %
0.012 / 0.020 %
> 20 000 psi
90 day / 1 yr
0.020 / 0.022 %
0.020 / 0.022 %
0.022 / 0.025 %
1Precision: Combined linearity, hysteresis, repeatability of measurements made by the reference pressure transducer. When using an absolute RPT
for gauge mode measurement add ± 2.5 Pa (0.00035 psi) to the precision specification to take into account the resolution and short term
stability of the on-board barometer used for dynamic atmospheric pressure compensation.
2Stability: Maximum change in zero and span over specified time period for typical transducer used under typical conditions. As stability can only be
predicted and varies from transducer to transducer, stability for a specific RPT should be established from experience.
3Accuracy: Maximum deviation of the reference pressure transducer indication from the TRUE value of the applied pressure including precision,
stability, temperature effect and calibration standard accuracy of ± 0.0035 % of reading.

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page 4
1.2.2.2 B TYPE REFERENCE PRESSURE TRANSDUCER (RPT)
Table 2 b Type RPT Designations and Ranges
b Type RPT Measurement Specifications (% FS of Active Range)
Transducer Type Micro-machined piezoresistive silicon
Warm Up Time None required
Resolution 10 ppm, user settable by individual range
Overpressure Limits
Without effect on calibration
Without permanent damage
120 % of Range 3
150 % of Range 3
Temperature Effect Fully compensated with active independent temperature
measurement from - 40 to 85 °C
± 0.02 % maximum temperature effect in normal ambient 15 to 35 °C
operating range
Acceleration Affect Insignificant on all axes
Precision10.03 %
Predicted Stability2
Gauge Mode (w/Autozero)
Absolute Mode (w/Autozero)
Absolute Mode (w/out Autozero)
90 day / 1 yr
0.02 % / 0.03 %
0.02 % / 0.03 %
0.03 % / 0.05 %
Measurement Accuracy3
Gauge Mode (w/Autozero)
Absolute Mode (w/Autozero)
Absolute Mode (w/out Autozero)
90 day / 1 yr
0.04 % / 0.05 %
0.04 % / 0.05 %
0.05 % / 0.06 %
1Precision: Combined linearity, hysteresis, repeatability of measurements made by the reference pressure transducer. When using an absolute RPT
for gauge mode measurement add ± 2.5 Pa (0.00035 psi) to the precision specification to take into account the resolution and short term
stability of the on-board barometer used for dynamic atmospheric pressure compensation.
2Stability: Maximum change in zero and span over specified time period for typical transducer used under typical conditions. As stability can only be
predicted and varies from transducer to transducer, stability for a specific RPT should be established from experience.
3Accuracy: Maximum deviation of the reference pressure transducer indication from the TRUE value of the applied pressure including precision,
stability, temperature effect and calibration standard accuracy of ± 0.0035 % of reading.
1.2.2.3 ON-BOARD BAROMETER
Sensor Technology Micro-machined silicon
Warm Up Time None required
Resolution 1.25 Pa (0.00018 psi)
The on-board barometer is NOT used as a source of absolute accuracy. It is
used only to measure changes in atmospheric pressure for dynamic
compensation of the atmospheric pressure offset when using an absolute
reference pressure transducer to make gauge pressure measurements (see
Section 3.4.1).

1. INTRODUCTION
Page 5 © 1998-2002 DH Instruments, Inc.
1.2.3 CONFIGURATIONS
RPM3 rear panel and internal schematic configurations vary depending on the number (1 or 2)
and pressure ranges of the RPM3’s RPT(s). For configuration purposes, RPTs are divided
into three groups by range designation as in Table 3.
Table 3 RPM3 Configurations
RPT GROUP RPT DESIGNATIONS TEST
CONNECTION SDS
1 A1500 or lower 1/8 in. NPT F Yes
2 A2000 to A10000 1/8 in. NPT F No
3 Greater than A10000 DH500 F No
In a single RPT RPM3, the RPT is referred to as the HI RPT.
In a dual RPT RPM3, the higher designation RPT is referred to as the HI RPT and the lower
designation RPT is referred to as the LO RPT.
Identify which RPT or RPTs your RPM3 is equipped with and refer to the corresponding
sections:
• One or two Group 1 (see Section 1.2.3.1)
• One Group 1 and one Group 2 (see Section 1.2.3.2)
• Two Group 2 (see Section 1.2.3.3)
• One Group 2 or one Group 3 (see Section 1.2.3.4)
Liquid filled Group 1 RPTs do NOT have SDS and MUST have their own test port.
The designation of the RPT(s) with which an RPM3 is equipped is given in the label window
just below the front panel display and on the power up introduction screen.

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page 6
1.2.3.1 ONE OR TWO RPTS: GROUP 1 (< A1500)
Table 4 One or Two RPTs: Group 1 (> A1500) Specifications
NUMBER
OF TEST
PORTS
HI RPT
TEST PORT
FITTING
LO RPT TEST
PORT FITTING
(IF 2 RPTS)
TEST (-) PORT
FITTING
(IF GXXXX RPT PRESENT)
SDS
PROTECTION
1 1/8 in. NPT F
Uses same
Test Port
as HI RPT
1/8 in. NPT F YES
(On all RPTs)
Figure 1 Rear Panel
(Left) One or Two Group 1 RPTs
(Right) One or Two Group 1 RPTs with a GXXXX RPT
Figure 2 Schematic
(Left) Two Group 1 RPTs
(Right) One Group 1 RPT
Group 1 liquid filled RPTs do NOT have SDS and MUST have their own test port. Therefore, liquid filled
Group 1 RPTs are presented in Group 2 format. See Sections 1.2.3.2, 1.2.3.3 and 1.2.3.4.

1. INTRODUCTION
Page 7 © 1998-2002 DH Instruments, Inc.
1.2.3.2 TWO RPTS: ONE GROUP 1 (> A1500) AND ONE GROUP 2
(> A1500 AND < A10000) OR ONE LIQUID FILLED GROUP 1
Table 5 Two RPTs: One Group 1 (> A1500) and One Group 2
(> A1500 and < A10000) or One Liquid Filled Group 1 Specifications
NUMBER
OF TEST
PORTS
HI RPT
TEST PORT
FITTING
LO RPT TEST
PORT FITTING
(IF 2 RPTS)
TEST (-) PORT
FITTING
(IF GXXXX RPT PRESENT)
SDS
PROTECTION
2 1/8 in. NPT F 1/8 in. NPT F 1/8 in. NPT F
YES
(On LO, Group
1 RPTs only)
Figure 3 Rear Panel
(Left) One Group 1 RPT and One Group 2 RPT
(Right) One Group 1 GXXXX RPT and One Group 2 RPT
Figure 4 Schematic
One Group 1 RPT and One Group 2 RPT

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page 8
1.2.3.3 TWO RPTS: BOTH GROUP 2 (> A1500 AND < A10000) OR
LIQUID FILLED GROUP 1
Table 6 Two RPTs: Both Group 2 (> A1500 and < A10000) or
Liquid Filled Group 1 Specifications
NUMBER
OF TEST
PORTS
HI RPT
TEST PORT
FITTING
LO RPT TEST
PORT FITTING
(IF 2 RPTS)
SDS
PROTECTION
2 1/8 in. NPT F 1/8 in. NPT F
YES
(On LO, Group
1 RPTs only)
Figure 5 Two Group 2 RPTs
(Left) Rear Panel / (Right) Schematic

1. INTRODUCTION
Page 9 © 1998-2002 DH Instruments, Inc.
1.2.3.4 ONE RPT: GROUP 2 (> A1500 AND > A10000) OR GROUP 3
(> A10000) OR LIQUID FILLED GROUP 1
Table 7 One RPT: Group 2 (> A1500 and < A10000) or
Group 3 (> A10000) or Liquid Filled Group 1 Specifications
NUMBER
OF TEST
PORTS
HI RPT
TEST PORT FITTING
SDS
PROTECTION
1 1/8 in. NPT F (If Group 2)
DH500 F (If Group 3) NO
Figure 6 Rear Panel
(Left) One Group 2 RPT
(Right) One Group 3 RPT
Figure 7 Schematic
(Left) One Group 2 RPT
(Right) One Group 3 RPT

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page 10
N
NO
OT TE ES S

2. INSTALLATION
Page 11 © 1998-2002 DH Instruments, Inc.
2
2. . I IN
NS ST TA AL LL LA AT TI IO ON N
2.1 UNPACKING AND INSPECTION
2.1.1 REMOVING FROM PACKAGING
RPM3 is delivered, along with its standard accessories, in a custom corrugated container
with polyurethane inserts to hold it in place.
Remove the RPM3 and its accessories from the shipping container and remove each
element from its protective plastic bag.
2.1.2 INSPECTING CONTENTS
Check that all items are present and have NO visible damage.
A standard RPM3 includes all items listed in Table 8.
Table 8 RPM3 Parts List
DESCRIPTION PART #
1 ea. RPM3 Reference Pressure Monitor FAM0003
1 ea. Calibration Certificate 550100
1 ea. Wrench, Open End, 5/8 in. 103044
1 ea. General Accessories Disk (white CD) 102987
ACCESSORIES: 401455
1 ea. User’s Manual 550094
1 ea. Power Cord (7.5 ft.) 100770
1 ea. General Accessories Disk (Important: Includes
system support software and documentation.)
102987
2.2 SITE REQUIREMENTS
Install RPM3 on any stable surface at a convenient height. The front feet are extendible so that the unit
can be inclined for easier viewing.
The RPM3 can also be mounted in a standard 19 in. rack mount using the optional rack mount kit.
Consider ready access to the RPM3 rear panel if TEST port connections may be changed frequently.
Support facilities required include an electrical power source of 85 to 264 VAC, 47 to 440 Hz.

RPM3™ OPERATION AND MAINTENANCE MANUAL
© 1998-2002 DH Instruments, Inc. Page 12
2.3 INITIAL SETUP
2.3.1 PREPARING FOR OPERATION
To prepare RPM3 for check out and operation:
Remove the plastic caps from the RPM3 rear panel pressure connections.
Remove the protective plastic sheet from the front panel display.
Familiarize yourself briefly with the front and rear panels (see Sections 2.3.2.1 and
2.3.2.2).
2.3.2 FRONT AND REAR PANELS
2.3.2.1 FRONT PANEL
The front panel assembly provides a 2 X 20 vacuum fluorescent display of RPM3
operating status, a membrane keypad for local user interface and a soft ON/OFF key.
12
4
53
1. Display
2. Multi-Function Keypad
3. Remote Indicator
4. RPT Designator Label
5. Soft ON/OFF Key and Indicator
Figure 8. Front Panel