DH Instruments RPM3 - VERSION 2002, RPM3 Operation And Maintenance Manual

RPM3™

Reference Pressure Monitor

Operation and Maintenance Manual

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.

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

AABBLLEE

OONNTTEENNTTS

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

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

LIQUID FILLED GROUP 1 .........................................................................................................................

GROUP 1 ...................................................................................................................................................

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

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

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

AABBLLEES

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)

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

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

or One Liquid Filled Group 1 Specifications..............................................................................

Liquid Filled Group 1 Specifications ..........................................................................................

FIGURES & TABLES

IIGGUURREES

Figure 1 Rear Panel (Left) One or Two Group 1 RPTs (Right) One or Two Group 1 RPTs with

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

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,

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,

Figure 16 Relationship of the QUEStionable Registers and Its Support Registers................................. 105

Figure 17 RPM3 Internal View ................................................................................................................. 116

a GXXXX RPT ...........................................................................................................................

GXXXX RPT and One Group 2 RPT.........................................................................................

and ISUMmary Registers ......................................................................................................

101

104

RPM3™ OPERATION AND MAINTENANCE MANUAL

BBOOUUTT

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!

HHIISS

AANNUUAAL

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

11..

NNTTRROODDUUCCTTIIOON

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

Operating Temperature Range

Storage Temperature Range

Vibration

Weight

Dimensions

Microprocessors

Communication Ports

Overall Pressure Ranges

Operating Media

85 to 264 VAC, 47 to 440 Hz, 18 VA max. consumption

15 to 35 °C

-20 to 70 °C

Meets MIL-T-28800D

3.5 kg (7.7 lb) max depending on RPT configuration

8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.) approx.

Motorola 68302

RS-232 (COM1), RS-232 (COM2), IEEE-488

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

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

Pressure Connections

Pressure Limits

Self Defense System (SDS™)

CE Conformance

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

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)

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)

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

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

Warm Up Time

Resolution

Overpressure Limits

Without effect on calibration Without permanent damage

Temperature Effect

Oscillating quartz resonator

≤ 1 500 psi 15 minutes

To 1 ppm, user settable by individual range

115 % of Range 3 125 % of Range 3

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

Precision

± 0.008 % /g maximum, worst axis

≤ 1 500 psi 0.005 %, > 10 500 and ≤ 20 000 psi 0.010 %, > 20 000 psi 0.015 %

Predicted Stability

Absolute Mode (w/out Autozero)

Measurement Accuracy

Absolute Mode (w/out Autozero)

Precision: Combined linearity, hysteresis, repeatability of measurements made by the reference pressure transducer. When using an absolute RPT

Stability: Maximum change in zero and span over specified time period for typical transducer used under typical conditions. As stability can only be

Accuracy: Maximum deviation of the reference pressure transducer indication from the TRUE value of the applied pressure including precision,

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.

predicted and varies from transducer to transducer, stability for a specific RPT should be established from experience.

stability, temperature effect and calibration standard accuracy of ± 0.0035 % of reading.

Gauge Mode (w/Autozero)

Absolute Mode (w/Autozero)

Gauge Mode (w/Autozero)

Absolute Mode (w/Autozero)

All Ranges

90 day / 1 yr

0.003 % / 0.009 %

0.006 % / 0.0015 %

≤ 1 500 psi

90 day / 1 yr

0.008 / 0.012 %

0.010 / 0.017 %

> 1 500 ≤ 20 000 psi

90 day / 1 yr

0.012 / 0.015 %

0.012 / 0.020 %

> 20 000 psi

90 day / 1 yr

0.020 / 0.022 %

0.022 / 0.025 %

RPM3™ OPERATION AND MAINTENANCE MANUAL

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

Warm Up Time

Resolution

Overpressure Limits

Without effect on calibration Without permanent damage

Temperature Effect

Micro-machined piezoresistive silicon

None required

10 ppm, user settable by individual range

120 % of Range 3 150 % of Range 3

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

Precision

Predicted Stability

Gauge Mode (w/Autozero)

Absolute Mode (w/Autozero)

Absolute Mode (w/out Autozero)

Measurement Accuracy

Gauge Mode (w/Autozero)

Absolute Mode (w/Autozero)

Absolute Mode (w/out Autozero)

Precision: Combined linearity, hysteresis, repeatability of measurements made by the reference pressure transducer. When using an absolute RPT

Stability: Maximum change in zero and span over specified time period for typical transducer used under typical conditions. As stability can only be

Accuracy: Maximum deviation of the reference pressure transducer indication from the TRUE value of the applied pressure including precision,

predicted and varies from transducer to transducer, stability for a specific RPT should be established from experience.

stability, temperature effect and calibration standard accuracy of ± 0.0035 % of reading.

Insignificant on all axes

0.03 %

90 day / 1 yr

0.02 % / 0.03 %

0.03 % / 0.05 %

90 day / 1 yr

0.04 % / 0.05 %

0.05 % / 0.06 %

1.2.2.3 ON-BOARD BAROMETER

Sensor Technology

Warm Up Time

Resolution

The on-board barometer is NOT used as a source of absolute accuracy. It is

Micro-machined silicon

None required

1.25 Pa (0.00018 psi)

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

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

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

TEST

CONNECTION

SDS

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

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

1 1/8 in. NPT F

HI RPT

TEST PORT

FITTING

LO RPT TEST

PORT FITTING

(IF 2 RPTS)

Uses same

Test Port

as HI RPT

TEST (-) PORT

FITTING

(IF GXXXX RPT PRESENT)

1/8 in. NPT F

SDS

PROTECTION

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

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.

Figure 2 Schematic

(Left) Two Group 1 RPTs

(Right) One Group 1 RPT

1. INTRODUCTION

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

2 1/8 in. NPT F 1/8 in. NPT F 1/8 in. NPT F

HI RPT

TEST PORT

FITTING

LO RPT TEST

PORT FITTING

(IF 2 RPTS)

TEST (-) PORT

FITTING

(IF GXXXX RPT PRESENT)

SDS

PROTECTION

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

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

2 1/8 in. NPT F 1/8 in. NPT F

HI RPT

TEST PORT

FITTING

LO RPT TEST

PORT FITTING

(IF 2 RPTS)

SDS

PROTECTION

YES

(On LO, Group

1 RPTs only)

Figure 5 Two Group 2 RPTs

(Left) Rear Panel / (Right) Schematic

1. INTRODUCTION

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

1/8 in. NPT F (If Group 2)

HI RPT

TEST PORT FITTING

DH500 F (If Group 3)

SDS

PROTECTION

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

OOTTEES

2. INSTALLATION

22..

NNSSTTAALLLLAATTIIOON

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

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.

1. Display

2. Multi-Function Keypad

3. Remote Indicator

Figure 8. Front Panel

4. RPT Designator Label

5. Soft ON/OFF Key and Indicator

2. INSTALLATION

2.3.2.2 REAR PANEL

The rear panel assembly provides pressure connections, communications interfaces and the power connection module. Pressure fittings are internally secured to prevent loosening when making and breaking connections.

1. Pressure Port(s), layout depending on RPT

Configuration (see Section 1.2.3)

2. Electrical Power Connector Configurations

(IEC320-C13)

Figure 9. Test Ports

3. IEEE-488 (GPIB) Connector

4. COM1 Connector

5. COM2 Connector

6. Label, Product (on bottom of case)

2.3.3 POWER CONNECTION

• Connect the power cable to the rear panel power module

• Do NOT connect the other end of the power cable to a power source yet

RPM3 is always powered and active when power is supplied through the rear panel power

connector. The front panel ON/OFF key controls a soft ON/OFF (see Section 3.1.2.3).

2.3.4 TEST PORT CONNECTING

Depending on the reference pressure transducer (RPT) configuration of the specific RPM3, the TEST port layout, TEST port fittings and acceptable test medium differ (see Sections

1.2.3 and 1.2.1).

Using a pressure hose or tube of appropriate pressure rating, connect the appropriate TEST port to the test system or supply from which pressure is to be measured. The RPM3 TEST port is either a 1/8 in. NPT F or a DH500 F, high pressure fitting. Always use compatible male hardware of the same type. Use Teflon tape or another sealer to make 1/8 in. NPT connections.

If RPM3 is equipped with a gauge RPT (GXXXX), it has a TEST(-) port. The TEST(-) port is connected to the low side of the gauge RPT. This connection is normally left open to atmosphere. It can also be connected to the low side of a differential device that is being calibrated or tested. When measuring very low pressures, this may enhance the results by helping assure that the RPM3 and the device under test reference ports are at the same pressure (see Section 1.2.3).

RPM3™ OPERATION AND MAINTENANCE MANUAL

USE THE CORRECT TEST PORT: Some RPM3s have more than one TEST port

corresponding to more than one internal RPT. Before connecting an RPM3 TEST port to a pressure source, familiarize yourself with the RPTs, their pressure limits and their TEST port fittings (see Section 1.2.3). In most cases, over-pressuring an RPT by more than 25 % will damage it beyond repair.

USE THE CORRECT PRESSURE CONNECTORS: RPM3 TEST port fittings are either 1/8 in.

NPT F or DH500 F (see Section 1.2.1). Never use fittings other than the corresponding male fittings in these connectors. Damage to the connectors and dangerous failure under pressure could result from using incorrect fittings.

NEVER connect a pressure source to the TEST(-) port. The pressure applied to this port

should be maintained at standard atmospheric pressure ± 3 psi (20 kPa). Exceeding these limits may damage the RPT.

USE THE PROPER MEDIUM: b Type RPTs are intended for use only with dry (instrument

grade, non-condensing), non-corrosive gases. Contaminated gases may cause measurement shifts and offsets. Standard RPTs are delivered for set up for gas operation (A6000 and lower) or liquid operation (A10000 and higher). Contaminating gas operated RPTs with liquids may cause aberrant measurements.

SDS Self Defense System: RPTs designated A1500 or lower include the SDS Self Defense

System. SDS, operated properly, allows a Group 1 RPT TEST port (see Section 1.2.3) to be left connected to a pressure up to 2 000 psi (13 MPa) without damage to the RPT. Do NOT attempt to use SDS in this manner without first becoming thoroughly familiar with its operations and limitations (see Sections 3.1.2.6, 3.2.8, and 3.4.2).

2.3.4.1 THE ATM AND VENT PORTS

The ATM pass through is connected to the on-board barometer. This connection assures that the on-board barometer actually measures ambient atmospheric pressure rather than the pressure inside the RPM3 case that may vary slightly from ambient pressure. The ATM port should be left open and unobstructed.

The VENT port is only present on RPM3s equipped with SDS Self Defense System (Group 1 RPTs only) (see Sections 1.2.3 and 3.1.2.6). The VENT port is connected to the SDS vent valve to assure that any gases vented through SDS escape outside the RPM3 case. A connection may be made to the VENT port to direct these gases if desired but the port must NOT be obstructed. Obstructing the VENT port may interfere with SDS operation.

NEVER plug or obstruct the ATM pass through as this may adversely affect

gauge mode operation and autozeroing on an absolute transducer.

2. INSTALLATION

NEVER plug or obstruct the VENT pass through as this may interfere with

SDS operation and RPT autozeroing (see Section 3.1.2.6).

2.4 POWER UP AND VERIFICATION

2.4.1 APPLY POWER

Connect the RPM3 power cable to an electric supply of 85 to 264 VAC (47 to 440 Hz). Observe the front panel display as RPM3 initializes, error checks and goes to the main run screen (see Section 3.1.1).

RPM3 is always powered and active when power is supplied through the rear panel power

connector. The front panel ON/OFF key controls a soft ON/OFF (see Section 3.1.2.3).

If the RPM3 fails to reach the main run screen, service is required. Record the sequence of operation and displays observed.

Any SDS present in RPM3 is active at power up. This causes SDS to flash over the

measured pressure (see Section 3.1.2.6).

The active range on power up is the same as the range that was active at the last power

down (see Section 3.1.2.5).

2.4.2 CHECK PROPER PRESSURE MEASUREMENT OPERATION

2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT

If the RPM3 has an absolute RPT (designated AXXXX), check that it operates properly in absolute mode.

Make sure that the TEST port of the RPT is open to atmosphere.

Use [RANGE] to change ranges if necessary (see Section 3.2.1). Select a range of the absolute RPT.

Press [MODE] and select absolute mode (available on AXXXX RPTs only). Change the pressure unit if desired (see Section 3.2.2).

If SDS is ON (SDS flashes over the pressure indication on the top display line), turn SDS OFF. Press [SDS] and select <2 Yes> to defeat SDS (see Section 3.2).

Do NOT defeat SDS with a pressure higher than the active range maximum applied to the

TEST port. Damage to the RPT may result.

RPM3™ OPERATION AND MAINTENANCE MANUAL

Observe the current value of atmospheric pressure. Check that the value agrees with the local value of atmospheric pressure within measurement tolerances. Repeat this process for all the ranges on both RPTs if the RPM3 has two absolute RPTs. Check that the values of atmospheric pressure measured by the different ranges agree with each other within RPM3 measurement tolerances (see Section 1.2.2). If they do NOT agree within tolerances, RPM3 may need calibration or repair.

2.4.2.2 CHECKING GAUGE MODE PRESSURE MEASUREMENT

Make sure that the TEST port(s) of the RPT(s) is/are open to atmosphere.

Use [RANGE] to change ranges if necessary (see Section 3.2.1). Select a range of the RPT.

Press [MODE] and select gauge mode. Change the pressure unit if desired (see Section 3.2.2).

If SDS is ON (SDS flashes over the pressure indication on the top display line), turn SDS OFF. Press [SDS] and select <2Yes> to defeat SDS (see Section

3.2.8).

Do NOT defeat SDS with a pressure higher than the RPT maximum applied to

the TEST port. Damage to the RPT may result.

The value indicated should be near zero (± 6 psi, 35 kPa). Press [AutoZ]. This runs AutoZ to zero the range (see Section 3.2.9). Upon return to the main run screen, observe that the indication of measured pressure has zeroed.

Use [RANGE] to change ranges, repeat the zeroing process for each range.

If a range fails to zero properly, RPM3 may need repair.

It is normal for RPM3 to indicate a value other than zero when vented when

gauge mode is first entered or ranges are changed, especially if AutoZ is OFF and/or RPM3 has been OFF for some time or its location has changed.

2.5 SHORT TERM STORAGE

The following is recommended for short term storage of RPM3:

Vent the RPM3 TEST port.

Disconnect the power supply.

When RPM3 will NOT be used for some time, it may be left powered, but use the soft ON/OFF key to turn OFF the display.

3. OPERATION

33..

PPEERRAATTIIOON

3.1 GENERAL/MANUAL OPERATION

RPM3 is designed to offer the optimum balance between simple, straight forward operation and the availability of a wide variety of functions with a high level of operator discretion if desired. The local operator interface is through a 2 x 20 character alpha-numeric display and a 4 x 4 multi-function keypad.

3.1.1 MAIN RUN SCREEN

The RPM3 main run screen is its home display that is reached on power up and from which other functions and menus are accessed. It is the top level of all menu structures.

The main run screen is where the RPM3 is left in normal operation. It displays the current measured pressure as well as a variety of additional information if desired.

1. <k> Ready/NOT ready indication, <k> when ready, <-> or <¯> indicating direction of measured pressure evolution when NOT ready (see Section 3.1.2).

2. <PRESSURE1> Numerical value and sign of pressure measured by active RPT and range. Shows result of last average in average display mode (see Section 3.2.6.1). <**SDS**>: To indicate when SDS is ON (see Section

3.1.2.6) for the active RPT, **SDS** is displayed alternating with PRESSURE1.

3. <UNIT> Current unit of measure (see Section 3.2.2).

4. <M> Pressure measurement mode: <g> for gauge, <a> for absolute (see Sections 3.2.3 and 3.2.2).

5. <h> Indicates whether a head correction is applied. <h> if applied, blank if NOT (see Section 3.2.7).

6. <z> Indicates whether the autozero function is ON or OFF. <z> if ON; blank if OFF (see Section 3.4.1).

7. <RR> Indicates active RPT (<H> = high, <L> = low) and range (<1> = low, <2> = mid, <3> = hi) (see Section 3.2.1).

8. <DISPLAY FUNCTION> Information displayed depends on current display function.

9. <D> Indication of what is being displayed on the bottom line of the display as set by the DISPLAY function (see Section 3.2.6). Choices include:

• <s> Current DISPLAY mode is average (see Section 3.2.6.1).

• <R> Current DISPLAY mode is rate (see Section 3.2.6.2); or if <n avg> is in the bottom right hand corner of the display, current DISPLAY mode is average and this is the instantaneous reading average screen (see Section 3.2.6.1).

• <H> Current DISPLAY mode is hi/lo (see Section 3.2.6.5).

• <D> Current DISPLAY mode is deviation (see Section 3.2.6.3).

• <S> <-> or <¯> Current DISPLAY mode is RPT (see Section 3.2.6.4).

• <F> Current DISPLAY mode is freeze (see Section 3.2.6.6).

• Blank, NO character Current DISPLAY mode is clean (see Section 3.2.6.7).

* PRESSURE1 UNITM hZRR

D DISPLAY FUNCTION

RPM3 has a screen saver function that causes the display to dim if NO key is pressed

for 10 minutes. Pressing a key restores full power to the display. The screen saver activation time can be changed or screen saving can be completely suppressed (see Section 3.4.7.1).

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.1.2 GENERAL OPERATING PRINCIPLES

3.1.2.1 KEYPAD LAYOUT AND PROTOCOL

The RPM3 has a 4 x 4 keypad for local operator access to direct functions, function menus and for data entry.

The [ENTER] key generally causes execution or forward movement in the menu tree. The [ESCAPE] key moves back in the menu tree and/or causes execution to cease or suspend

without changes being implemented. Pressing [ESCAPE] repeatedly eventually returns to the main run screen. From the main run screen, pressing [ESCAPE] allows momentary viewing of the RPM3 introduction screen.

The [+/-] key changes a numerical sign when editing. It also toggles through multiple screens when available.

The [

They are also used to scroll through choices.

] and [ ]keys allow reverse and forward cursor movement when editing data entry.

Figure 10 Keypad

1. The Function/Data keys allow very commonly

used functions to be accessed directly from the main run screen by a single keystroke. The name of the function is on the bottom half of the key (see Section 3.1.2.7). These keys enter numerical values when editing.

2. The Editing and Execution keys are for

execution, suspending execution, backing up in menus and editing entries.

3. The Menu/Data keys provide access to function

menus from the main run screen. The menu name is on the bottom half of the key. The SETUP menu is for more frequently used functions (see Section 3.3). The SPECIAL menu is for functions that are NOT generally used as a part of day to day operation (see Section 3.4). These keys enter numerical values when editing.

Key press confirmation is provided by both tactile and audible feedback. A single tone confirms a valid entry, a descending two note tone signals an invalid entry. The audible valid entry feedback can be suppressed or modified by pressing [SPECIAL] and selecting <7Intern>, <2sound> (see Section 3.4.7.2).

Some screens go beyond the two lines provided by the display. This is

3.1.2.2 SOUNDS

RPM3 is equipped with a variable frequency tone device to provide audible feedback and alarms. The beeper is used for the following indications.

Valid key press - Brief beep, choice between three frequencies or NO sound is available (see Section 3.4.7.2)

Invalid key press - Descending two tone blurp

Leak check routine completed - Three two second beeps (see Section 3.3.5)

UL (upper limit) exceeded - Intermittent one second beeps (see Section 3.2.4)

Pmax! (overpressure limit) exceeded - Eight second high frequency beep

(see Section 3.2.4.1)

indicated by a flashing arrow in the second line of the display. Use [ ] and [

] to move the cursor to access the lines that are NOT visible or

directly enter the number of the hidden menu choice if you know it.

3. OPERATION

3.1.2.3 SOFT [ON/OFF] KEY

RPM3 is equipped with a soft [ON/OFF] key and indicator LED on the bottom left hand corner of the front panel. The purpose of the soft ON/OFF key is to put RPM3 into a dormant mode in which the display is turned OFF but power is still supplied and SDS and overpressure functions are still active. When RPM3 is ON, the ON/OFF indicator is ON continuously. When RPM3 is soft OFF, the ON/OFF indicator blinks every five seconds.

The soft [ON/OFF] key can also be used to reset from an overpressure condition (see Section 3.2.4.1).

When RPM3 is soft OFF, receiving a remote command turns it ON.

Turning RPM3 soft OFF does NOT turn SDS ON. Do NOT assume that SDS

is ON when an RPM3 is soft OFF. Disconnecting power completely turns SDS ON (see Section 3.1.2.6).

3.1.2.4 PRESSURE READY <*>/NOT READY (<↑> OR <↓>)

The character to the left of the measured pressure on the main run screen provides a pressure Ready (<*>)/Not Ready (<↑> or <↓>) indication. This indication is intended to provide the user with a clear and objective indication of when a stable pressure has been achieved. Ready <*> is indicated when the current stability (rate of change) of pressure is less than the stability limit. The user can set the stability limit (see Section 3.3.4). The ready indication is often used when comparing the RPM3 and a test device to indicate when a valid reading can be made.

Ready (<*>)/Not Ready (<↑> or <↓>) character indications are:

<k > Pressure ready (stable)

<↑> Pressure NOT ready (unstable) and decreasing

<↓> Pressure NOT ready (unstable) and increasing

3.1.2.5 MULTIPLE PRESSURE RANGES

RPM3 has one or two reference pressure transducers (RPT) each of which has three ranges for a total of three or six pressure ranges. This multi-ranging feature allows accuracy to be optimized for the range of pressure in which you are working. Generally, the best range to select (see Section 3.2.1) is that whose full scale is closest to, but greater than, the maximum pressure of the device or system under test.

RPM3 handles all of the data operations needed to make range changes occur transparently to the user when the RANGE function is used for range selection. For a range change to be executed, the current pressure applied to the RPT on which the range is being selected must be lower than the current upper limit (UL) of that range (see Section 3.2.4).

When ranges are changed, the upper limit is automatically changed to the default for that range or to the last upper limit set for that range. In addition, most other functions and settings are range specific (see Section 3.2.1).

RPM3™ OPERATION AND MAINTENANCE MANUAL

Each RPM3 has three or six ranges. In general, settings and operational

adjustments are specific to the range currently in use, as if you had six instruments rather than one. The DISPLAY function, HEAD functions and AUTO READRT function are NOT range specific. In remote mode, most settings are RPT specific rather than

RPM3 internal pressure schematics and rear panel TEST port configurations

change depending on the number of RPTs and their ranges. See Section 1.2.3 for details on possible RPM3 configurations.

Ranges and Identification

The currently active RPT and range is continuously indicated in the upper right hand corner of the main run screen and most other screens (see Section 1.2.2 for complete listing of the RPTs available and their ranges).

Hi RPT The RPT in a single RPT RPM3 or the RPT with the highest

maximum range in a dual RPT RPM3 is referred to as the Hi RPT.

Lo RPT The RPT with the lower maximum range in a dual RPT RPM3

is referred to as the Lo RPT.

Range 1, 2 or 3 The three ranges of an RPT are referred to as 1 = lo range,

2 = mid range, 3 = hi range.

Table 9. RPM3 Range Identification Summary

REFERENCE PRESSURE

TRANSDUCER AND RANGE

Lo RPT, Lo range Lo, 1 L1

Lo RPT, Mid range Lo, 2 L2

Lo RPT, Hi range Lo, 3 L3

Hi RPT, Lo range Hi, 1 H1

Hi RPT, Mid range Hi, 2 H2

Hi RPT, Hi range Hi, 3 H3

* The display symbol is included in the upper, right hand corner of most RPM3 menu displays as a convenient

indicator of active range.

DESIGNATION DISPLAY SYMBOL *

3.1.2.6 SDS SELF DEFENSE SYSTEM

RPTs designated A1500 or lower that are NOT liquid filled are equipped with the SDS self defense system. The SDS system includes hardware and embedded software logic to protect RPTs from overpressure. When SDS is ON for an RPT, that RPT is isolated from the RPM3 TEST port and opened to the VENT port (See Figure 11 and Sections 1.2.3 and 5.6.1.1).

In dual RPTs with a single TEST port, SDS is used to protect the Lo RPT from overpressure when the high RPT is in use.

RPM3 internal logic uses SDS to protect against accidental overpressure. Whenever RPM3 is ON (or in soft OFF mode) it monitors the pressure read by its RPTs. If the pressure reaches the maximum pressure limit for a range, SDS will activate automatically to isolate the RPT from the TEST port and vent it to atmosphere.

3. OPERATION

SDS can also be used to isolate an RPM3 from a test system which may sometimes be subjected to pressures higher than the RPM3s maximum pressure. When configuring a multi-range system, this can eliminate the need for external valving or connecting and disconnecting RPM3s. When used in this manner, SDS should be activated prior to applying pressure. Automatic SDS activation should only be used in an emergency overpressure situation.

SDS ON - ISOLATION Closed / VENT Open

SDS OFF - (Defeated) ISOLATION Open / VENT Closed

Figure 11 SDS Schematic

The maximum pressure that should be applied to an RPM3 TEST port when

SDS is ON is 2 000 psi (13 MPa).

Though the SDS self defense system includes features to automatically

protect RPTs against accidental overpressure, SDS should NOT be considered a fail-safe overpressure protection system. SDS cannot guarantee that overpressure damage will NOT occur. SDS automatic activation may protect an RPT in case of accidental overpressure but conventional measures for protecting against overpressure should also always be followed. Damage to RPTs due to overpressure is NOT covered by the RPM3 product warranty even when SDS is present.

3.1.2.7 DIRECT FUNCTION KEYS SUMMARY

Local operation of RPM3 is through the 4 x 4 pressure sensitive keypad. To minimize the use of multi-layered menu structure, the 4 x 4 keypad numerical keys also provide direct access to the most commonly used functions. The function accessed is labeled on the bottom half of the keys. Direct function keys are active whenever RPM3 is in its main run screen. Table 10 summarizes the operation of the direct function keys.

Table 10 provides a brief summary of direct function key operation. It may be

useful to keep a copy of this summary near the RPM3, especially when first becoming acquainted with its operation.

RPM3™ OPERATION AND MAINTENANCE MANUAL

Table 10 Summary of RPM3 Direct Function Key Operation

Direct function keys are active from the main run screen.

See corresponding manual sections for full detail.

DIRECT FUNCTION KEYS ARE ACTIVE FROM ANY RUN SCREEN

See corresponding manual sections for full detail.

Menu of commonly used setup features including run LEAK CHECK.

(main, ambient, system).

View/adjust upper limit.

Menu of commonly used setup features including run LEAK CHECK.

Menu of less frequently used internal functions and settings.

Adjust height of fluid head correction. Set to zero to defeat head correction.

Turn SDS (Self Defense System) ON/OFF (if present). SDS ON is indicated by flashing <***SDS***>. SDS must be turned OFF to measure pressures applied to TEST port. Use with caution as turning SDS OFF with overpressure on test port could damage RPT.

Runs AutoZ to rezero active range. Should be used in gauge mode whenever vented.

3.2 DIRECT FUNCTION KEYS

Adjust display resolution of measured pressure and other indications and settings.

Select [DISPLAY] function for second line of RPM3 display. Choices include <average>,

<rate>, <other RPT>, <Hi/Lo>, <Deviation>, <Freeze>, <Clean>.

View/Select ranges. Shows active range and then toggles through available ranges. Pressing [ENTER] on a range activates it.

Change pressure measurement unit. Choice of units can be customized.

Change pressure measurement mode (<gauge>, <absolute>).

3.2.1 [RANGE]

 PURPOSE

To view and/or change the active pressure measurement range.

 PRINCIPLE

Each RPM3 has three or six ranges (see Section 3.1.2.5).

The [RANGE] key allows the range values to be viewed and a range selection to be made.

Most RPM3 settings such as pressure unit of measure (UNIT) and measurement mode (MODE), are range specific. Changes made while in one range apply to that range only and do NOT affect the other ranges (see Section 3.2.1).

 OPERATION

Pressing [RANGE] activates the range viewing and selecting function. Pressing [RANGE] key again or [+/-] while in the RANGE function steps through displays of available ranges: Lo to Hi.

3. OPERATION

When [RANGE] is first pressed, the active reference pressure transducer (RPT) and range are displayed, for example:

1. Identifies active RPT (LO or HI).

2. Identifies active range (1, 2 or 3) of the active RPT.

3. Range designator.

4. Full scale pressure value in the current units for the RPT and range when used in gauge (g) or absolute (a) mode. If the RPT is a gauge only RPT there is NO absolute (a) range indicated.

5. Unit of measure (the unit of measure currently active for this range).

Current LO,Rng3 L3

psi 35g/50a

Pressing [RANGE] again or [+/-] causes the screen to step through the other available ranges in sequence Lo to Hi, for example:

1. Identifies RPT (LO or HI).

2. Identifies range of the RPT (1, 2 or 3).

3. Range designator.

4. Full scale pressure value in the active units of measure for the RPT and range number when used in gauge (g) or absolute (a) mode. If the RPT is a gauge only RPT there is NO absolute (a) range indicated.

5. Units of measure (the unit of measure currently active for the range).

Select HI,Rng1 H1

psi 300g/300a

Range full scale limits are given in the pressure unit that is currently active for that

range.

Pressing [ENTER] while in the RANGE function causes the RPM3 to attempt to change the active range to the range currently displayed. If the pressure currently applied to the RPT with the new range is less then the current upper limit of that range (see Section 3.2.4), the range change will be completed.

Pressing [ESCAPE] while in the range function returns to the main run screen without changing ranges.

For a range change to occur, the pressure currently measured by the new range RPT must

be less than the current upper limit (see Section 3.2.4) of the new range. If this condition is NOT met when a range change is attempted, a warning message is displayed and the range change is NOT completed. Reduce the pressure applied to the TEST port and reattempt the range change. It is, however, possible to make a range change from RPT to another with pressure applied to the current RPT. If both RPTs are on a common TEST port, be sure to reduce pressure on the TEST port before making the range change.

SDS and Range Changes

Changing ranges causes the active RPT to change from the Lo RPT to the Hi RPT or viceversa, SDS will be turned ON for the RPT that is being changed from. This leaves the inactive RPT with SDS ON so that it is protected.

When changing ranges causes the active RPT to be changed, if the new active RPT is equipped with SDS, SDS will almost certainly be ON when the new range is activated (as indicated by the flashing SDS alternating with the pressure display). To open the RPT to the TEST port SDS must be turned OFF using the SDS function key (see Section 3.2.8).

RPM3™ OPERATION AND MAINTENANCE MANUAL

Range Specific Functions and Settings

In general, RPM3 functions and settings are range specific. They are set and stored for each range so that changing settings when in one range does NOT change settings in the other ranges. When returning to a range, settings are be the same as they were when the range was left.

Functions and settings that are NOT range specific are:

• Functions HEAD (see Section 3.2.7), DISPLAY (see Section 3.2.6)

• Setup Menu <3ReadRt> (see Section 3.3.3)

In remote mode, most settings are RPT specific rather than range specific (see Section 4.3).

3.2.2 [UNIT]

 PURPOSE

To specify the pressure unit of measure for the active range.

See also Section 3.2.3.

 PRINCIPLE

RPM3 allows the pressure measurement unit for a range to be changed. Internally, RPM3 always operates in Pascal (Pa), the SI unit of pressure. Values of pressure are represented in other units by the application of conversion factors to convert from Pa (see Section 7.1).

The pressure measurement unit selection (e.g., psi, kPa, etc.) is separate from the pressure measurement mode selection (gauge or absolute). See Section 3.2.3 for information on changing the measurement mode.

 OPERATION

To change the pressure measurement unit for the active range, press the [UNIT] function key. The display is:

The cursor is on the number corresponding to the active unit for the active range. To change the pressure unit for the active range, select the desired unit. The display returns to the main run screen with

1psi 2inWa 3inHg H3

kPa 5mmHg 6kcm2

the selected unit active.

If the pressure unit selected is inWa the reference temperature for water density must be specified. When inWa is selected as the unit, the next display is:

Select inWa ref temp

°C 20°C 60°F

Select the desired reference temperature for water density using [↑] or [↓] key to move the cursor. Pressing [ENTER] returns to the main run screen with inWa based on water density at the selected reference temperature as the pressure unit. The current inWa reference temperature can be viewed by observing the position of the cursor in the reference temperature screen. Reference temperature for inch of water units is NOT range specific.

No reference temperature selection is necessary for the unit mmWa as the only reference

temperature commonly used for mmWa is 4 ºC.

3. OPERATION

The pressure measurement unit selected is range specific. When in a given range, all

functions and settings are represented in the current measurement unit for that range. However, certain internal and/or metrological functions (e.g., RPT calibration coefficients) are always represented in Pa regardless of the active range unit. In addition, when the current unit is an altitude unit, the range and upper limit indications are in kPa if the unit is meters (m) and in psi if the unit is feet (ft).

See Section 7.1 for tables of the conversion factors used by RPM3.

The UNIT function provides rapid access to a choice of six units. The choice of units can

be customized from a wider selection by the user (see Section 3.3.2). The default six units of the UNIT function depend on whether the RPM3 is set up as a US or SI version (indicated by US or SI in the bottom right hand of the RPM3 introduction screen). To return the six units of the UNIT function key to default, see Section 3.4.5.2.

3.2.3 [MODE]

 PURPOSE

To set the measurement mode (gauge or absolute) for the active range.

See Section 3.2.2 also.

 OPERATION

RPTs designated AXXXX can be used by RPM3 to measure absolute or positive and negative gauge pressure. AXXXX RPTs have an evacuated and sealed reference so that they always measure absolute pressure. RPM3 supports extensive on-board measurements and logic to precisely subtract atmospheric pressure from absolute pressure when gauge pressure measurements are desired. A separate on-board barometer and unique atmospheric compensation system are used to assure highly accurate gauge pressure values even if atmospheric pressure changes between zeroing opportunities (see Section 3.4.1). This allows simple, one step switching between gauge and absolute measurement modes without special procedures or hardware.

RPTs designated GXXXX are referenced to atmospheric pressure. GXXXX RPTs are only used to measure gauge pressures. They do NOT support absolute measurement mode.

To change the pressure measurement mode for the active range, press [MODE]. The display is:

Measurement mode: H1

absolute 2gauge

The cursor is on the number corresponding to the current measurement mode. Making a measurement mode selection returns to the main run screen with the selected mode active.

If a measurement mode change is NOT currently possible (if the active RPT is gauge only

or if the current pressure unit is an altitude unit which can only be absolute), an error message displays when [MODE] is pressed.

RPM3™ OPERATION AND MAINTENANCE MANUAL

When going from absolute to gauge measurement mode, the AutoZ function should be

used to update the atmospheric pressure offset (see Sections 3.2.9, 3.2.9, and 3.4.1).

3.2.4 [UL] (UPPER LIMIT)

 PURPOSE

To set the upper limit value for the active range and measurement mode.

 PRINCIPLE

The UPPER LIMIT function provides the user with a settable pressure limit at which an alarm will sound.

When the upper limit is reached the RPM3’s beeper sounds intermittently.

The UPPER LIMIT function has two purposes. First, when UL is set to its default value, it serves as a warning that the maximum pressure of the active range is about to be exceeded. Second, UL can be set by the user to a lower value than the default value to provide an alarm that a specific pressure limit has been exceeded. This feature is often used to help protect an external device or system on which RPM3 is being used to measure pressure. For example, it might be set just over the full scale of a device under test (DUT) that is being calibrated.

The UL function is separate and different from the over-pressure (Pmax!) function. The Pmax!

function is NOT adjustable and activates regardless of UL setting when the maximum acceptable pressure for the active RPT range has been exceeded (see Section 3.2.4.1).

Upper limit settings are specific to each range and measurement mode (gauge or absolute).

 OPERATION

When [UL] is pressed from the main run screen the display is:

Upper limit: H3

1. Edit field to view current upper limit value and modify if desired.

105 psi a

Enter the desired upper limit value and RPM3 returns to the main run screen with the new upper limit value active.

When the upper limit has been exceeded, the display of current pressure flashes and the beeper sounds three times for two seconds. Reduce the pressure applied to the RPT to less than the upper limit to return to normal operation. For RPTs equipped with SDS, the SDS function can be used to isolate the RPT from the TEST port and rapidly vent it to atmosphere (see Sections 3.1.2.6 and 3.2.8).

Default upper limit values are 105 % of the range full scale for ranges 1 and 2 and 102 % FS for

range 3. If the range full scale is less than or equal to atmospheric pressure the default UL is just over atmospheric pressure to avoid exceeding UL when open to atmosphere. Upper limit values may be adjusted by the user. The adjusted value must be lower than or equal to the default value and lower then the current measured pressure.

3. OPERATION

Upper limit values are specific to each range and measurement mode. Do NOT assume

that the upper limit set in one measurement mode will apply to the other. For example, if you set 17 psi as the upper limit in gauge mode, the upper limit will NOT be 17 psi or the equivalent absolute pressure in absolute mode. The upper limit setting in one mode has NO affect on the upper limit setting in another mode.

Upper limit values are always specified and displayed in the current pressure unit except

for altitude units. When in altitude units, upper limits are expressed in kPa if the altitude unit is meters (m) and psi if the altitude unit is feet (ft).

[RANGE] is disabled so range changes cannot be made when the upper limit is exceeded.

3.2.4.1 OVER-PRESSURE FUNCTION (PMAX!)

In addition to the UL (Upper Limit) function, RPM3 has an over-pressure function (Pmax!). Whereas the UL function is a settable alarm to assist the operator in monitoring a pressure limit, Pmax! is a fixed limit intended as a warning that the maximum pressure acceptable for a range has been exceeded and damage to the RPM3 may be imminent. The Pmax! function activates when the maximum acceptable pressure for the current range on the active or inactive RPT has been exceeded. When the overpressure function activates because Pmax! has been exceeded:

• The beeper sounds continuously at high frequency for 8 seconds.

<Rng “RR” RPT EXCEEDED PMAX> and overpressure value display toggles with normal run screen (RR identifies the range that has exceeded Pmax! (e.g., L1, H3, etc.; the overpressure value is always in absolute pressure for an AXXXX RPT and gauge for a GXXXX RPT).

• <!!!Pmax!!!> displays in the main run screen instead of the measured

pressure so long as the pressure read by the active RPT exceeds Pmax!.

• The [SDS] and [RANGE] keys are disabled and display error messages

when pressed.

• SDS activates if present.

• The overpressure condition is logged.

To recover from an overpressure condition, remove the overpressure source and then clear the overpressure condition by cycling RPM3 power using the soft [ON/OFF] key (see Section 3.1.2.3) or by disconnecting and reconnecting the power cable. The overpressure message will continue to display until the overpressure condition has been cleared by cycling power.

The overpressure function monitors both the active and inactive RPT. When

an overpressure occurs, check the <Rng “RR” RPT exceeded> message to determine which RPT and range has been overpressured.

RPM3™ OPERATION AND MAINTENANCE MANUAL

Pmax! values are 110 % of the range full scale for ranges 1 and 2 and 104 % of

the range full scale for range 3. On absolute RPTs (AXXXX), Pmax! Is always in absolute and relative to the absolute range. In some cases, atmospheric pressure is added to Pmax! to accommodate the gauge mode equivalent of the absolute range.

When Pmax! is exceeded, <!!!Pmax!!!> displays on the RPM3 display top line

where the current pressure is normally displayed because the actual pressure applied can NO longer be indicated reliably.

3.2.5 [RES] (RESOLUTION)

 PURPOSE

To set the resolution with which measured pressures and other indications and settings are displayed.

 PRINCIPLE

The resolution with which the pressure measured by RPM3 is displayed can be adjusted. This feature can be used to reduce the resolution when lower precision measurements are being made and additional digits might confuse or distract the operator.

The resolution setting determines the number of digits with which pressure is displayed. The desired resolution is calculated based on the full scale of the range and then rounded to the furthest digit to the right. For example, resolution of 0.001 % on a range of 150 psi is 150 x 0.001 % = 0.0015 which is rounded down to 0.001 psi.

Default resolution settings are 0.001 % for standard RPTs and 0.01 % for b Type RPTs.

Maximum resolution setting is 0.0001 % for standard RPTs and 0.001 % for b Type RPTs.

 OPERATION

To access the resolution function, press [RES]. The display is:

Use the [

] and [ ] keys to select the desired level of resolution. Press [ENTER] to set

Measure resltn: H3

.0010% FS < and

the resolution and return to the main run screen.

The resolution setting affects the display of the measured pressure as well as other

indications and settings, such as quantities shown by DISPLAY functions (see Section

3.2.6), the reading of the on-board barometer, etc.

The resolution setting is range specific. A resolution setting made in one range does NOT

affect other ranges.

The measured pressure resolution is fixed for altitudes units at 1 m in meters and 1 ft in feet.

3. OPERATION

3.2.6 [DISPLAY]

 PURPOSE

To select, from a variety of choices, the information that is displayed on the second line of the RPM3 display.

 PRINCIPLE

RPM3 supports a variety of advanced pressure measurement functions that are displayed on the second (bottom) line of the RPM3 display. In summary, the available display functions included are:

AVERAGE Calculates the average pressure measurement over a user specified period

of time and displays the average, the standard deviation about the mean and a countdown in seconds to the next average (see Section 3.2.6.1). This function is often used to filter out pressure noise in an unstable system. The magnitude of the noise is quantified by the standard deviation about the mean. A second Avg screen allows the instantaneous pressure values to be viewed during an averaging cycle.

RATE Calculates and displays the current rate of change of pressure in current

pressure units/second (see Section 3.2.6.2). This function is a useful indication of the stability of the pressure being measured. It is often used as an indication of positive or negative leak rate and as a go/NO go criterion of when to take data when comparing RPM3 and a device under test, for

example in a calibration. Rate is used by the Ready (<*>)/Not Ready (<

function to determine when a Ready <*> condition exists (see Section 3.1.2.4).

↑> or <↓>)

DEVIATION Calculates and displays the difference between the pressure measured by

RPM3 and a target pressure defined by the user (see Section 3.2.6.3). This function is useful in monitoring the evolution of pressure around and/or away from a desired set point.

RPT If the RPM3 has two PRTs, allows pressure measurement from the two

RPTs to be displayed simultaneously (see Section 3.2.6.4). This function is particularly useful in dual RPT RPM3s with independent TEST ports to monitor two separate pressures simultaneously.

HI/LO Records and displays maximum and minimum pressures measured

(see Section 3.2.6.5). This function is used to keep track of the minimum and maximum pressure observed in a system over a period of time or to monitor if a pressure min/max limit has been exceeded.

FREEZE Captures and displays the pressure measured by the active range of RPM3

when the [ENTER] key is pressed (see Section 3.2.6.6). This function is useful to record the pressure present at the time of an operator observed trigger event, for example when the needle of an analog gauge was on the nominal point or when a switch activates.

CLEAN Blanks out the second line of the display (see Section 3.2.6.7).

This function is used when a simple display of pressure measured by the RPM3 active range without additional information is desired.

RPM3 also includes a leak check function (see Section 3.3.5).

RPM3™ OPERATION AND MAINTENANCE MANUAL

 OPERATION

To set the DISPLAY function press [DISPLAY] from the main run screen.

The display is:

The cursor is on the active DISPLAY function. Selecting a display function returns to the main run screen with the selected function active.

1Avg 2Rate 3Dev 4RPT

Hi/Lo 6Freez 7Clean

The DISPLAY selection is NOT range specific. A DISPLAY selection made in one range applies

to all ranges.

See Sections 3.2.6.1 to 3.2.6.7 for details on each DISPLAY function.

The default DISPLAY function is Rate which causes the second line of the display to show “R”

followed by the current rate of change of pressure in current pressure units per second.

3.2.6.1 AVG (AVERAGE)

 PURPOSE

To activate the AVERAGE DISPLAY and/or adjust the period of time over which averaging occurs.

See Section 3.2.6.

 OPERATION

To access the AVERAGE DISPLAY, press [DISPLAY] and select <1Avg>. The display is:

Averaging Period:

1. Edit field for averaging period in seconds. Default is 20. Minimum 1, maximum 999.

20 s

Edit the averaging time period if desired. Pressing [ENTER] returns to the main run screen with the Average DISPLAY active.

With the AVERAGE DISPLAY active the main run screen is:

1. Average measured over last completed averaging period.

2. Countdown in seconds until completion of on-going averaging period.

3. Standard deviation of last completed averaging period.

* 96.929 kPa a zH3

o 0.0007 18Avg

3. OPERATION

The AVERAGE DISPLAY has a second screen that allows the instantaneous pressure readings to be viewed while an averaging cycle is running. The instantaneous Average screen is:

1. Instantaneous pressure values at RPM3s normal integration rate.

2. Countdown in seconds until completion of on-going averaging period.

3. Current rate of change of pressure in pressure units/second.

* 96.929 kPa a zH3

R 0.0025 18Avg

The [+/-] key toggles between the main run Average screen and the instantaneous values Average screen.

In the AVERAGE DISPLAY the Ready <*>/Not Ready (<↑> or <↓>) indication

applies to the result of the previous averaging period. Ready <*> indicates that all readings during the previous averaging period met the stability

criterion (see Section 3.3.4). Not Ready (<

↑> or <↓>) indicates that one or

more readings were outside of the stability criterion (see Section 3.1.2.4).

Changing the pressure unit of measure, measurement mode (gauge or

absolute) or range while the averaging screen is active, starts a new averaging period.

Pressing [ENTER] while in the AVERAGE DISPLAY aborts the current

averaging period and causes a new one to begin. Pressing [ENTER] can thus be use to trigger a new averaging period on demand.

To go to a DISPLAY other than AVERAGE, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.2.6).

3.2.6.2 RATE

 PURPOSE

To activate the Rate DISPLAY.

See Section 3.2.6.

 OPERATION

To activate the RATE DISPLAY press [DISPLAY] and select <2Rate>. Selecting <2Rate> returns to the main run screen with the Rate DISPLAY active.

RPM3™ OPERATION AND MAINTENANCE MANUAL

D –

With the RATE DISPLAY active the main run screen is:

1. Current rate of change of pressure in current pressure units per second.

* 99.1135 psi a zH3

0.0001/sec

The RATE DISPLAY is different and separate from the stability setting which

is used to set the stability criterion on which the Ready <*>/Not Ready

↑> or <↓>) indication is based (see Sections 3.3.4 and 3.1.2.4). The Rate

(< DISPLAY only causes the current rate of change to be displayed and has NO

affect on the stability setting or the Ready <*>/Not Ready (<

↑> or <↓>)

condition.

To go to a DISPLAY other than RATE, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.2.6).

3.2.6.3 DEV (DEVIATION)

 PURPOSE

To activate the DEVIATION DISPLAY and/or set the deviation target value.

See Section 3.2.6.

 OPERATION

To activate the DEVIATION DISPLAY press [DISPLAY] and select <3Dev>. The display is:

Target:

00.0000 psi a

Edit the desired target value. Pressing [ENTER] returns to the main run screen with the DEVIATION DISPLAY active using the entered target value.

The target value is the value from which deviations (D) are measured by the

DEVIATION DISPLAY following:

D = current pressure - target pressure

With the DEVIATION DISPLAY active the main run screen is:

* 99.1135 psi a zH3

1. Current rate of change of pressure in current pressure units per second.

.8865 T100.0000

Pressing [ENTER] from the main run screen when the DEVIATION DISPLAY is

active goes directly to the Target editing screen. This allows the target value to be changed without going through the DISPLAY menu.

3. OPERATION

If the pressure measurement unit or mode (gauge or absolute) is changed

while the DEVIATION DISPLAY is active the target value remains at the same numerical value. It is NOT converted.

To go to a DISPLAY other than DEVIATION, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.2.6).

3.2.6.4 RPT

 PURPOSE

To activate the RPT DISPLAY.

See Section 3.2.6.

The RPT DISPLAY is only available in dual RPT RPM3s.

 OPERATION

For the sake of clarity, when describing the RPT DISPLAY, the active RPM3

range when the RPT function is selected is referred to as the “active” range. This is the range that is displayed on the first line of the display. The other RPT and the range to be displayed on the second (bottom) line of the RPM3 display are referred to as the “inactive” RPT and range. They are “inactive” in the sense that all RPM3 functions and settings such as UNIT and RES still apply to the “active” RPT. To make changes to the “inactive” RPT, for example to change its measurement units, it must be made the active RPT by a conventional range change (see Section 3.2.1).

To activate the RPT DISPLAY, press [DISPLAY] and select <4RPT>. The display is:

1. Lo or Hi - whichever RPT is currently inactive.

Select the desired range of the inactive RPT. Making the range selection returns to the main run screen with the RPT DISPLAY active.

If the RPM3 is a single RPT RPM3, <Not available with single RPT!> displays

Select Lo RPT range:

Lo 2Med 3Hi

for five seconds when you press [DISPLAY], and select <4RPT>. Operation returns to the main run screen.

RPM3™ OPERATION AND MAINTENANCE MANUAL

With the RPT DISPLAY active the main run screen is:

1. Active RPT display.

2. Inactive RPT display.

* 99.1135 psi a zH3

* 2350.23 psi g zL2

If the inactive RPT is equipped with SDS Self Defense System (see Section

3.1.2.6), SDS will almost certainly be ON when the RPT DISPLAY is activated. SDS can be defeated on the inactive RPT by pressing [SPECIAL] and selecting <2SDS> (see Section 3.4.2).

With the RPT display active, executing a range change to a range on the

inactive RPT causes the range change to occur making the inactive RPT the active RPT. The DISPLAY defaults back to Rate.

To go to a DISPLAY other than RPT, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.2.6).

3.2.6.5 HI/LO

 PURPOSE

To activate the HI/LO DISPLAY.

See Section 3.2.6.

 OPERATION

To activate the HI/LO DISPLAY press [DISPLAY] and select <5Hi/Lo>. Selecting <5Hi/Lo> resets the Hi/Lo values and returns to the main run screen

with the HI/LO DISPLAY active.

With the Hi/Lo DISPLAY active the main run screen is:

* 99.1135 psi a zH3

1. Lowest pressure observed since Hi/Lo reset.

2. Highest pressure observed since Hi/Lo reset.

99.1135 LL99.1135

The Hi/Lo values change each time a new Hi or Lo pressure is observed.

The Hi/Lo record can be reset at any time by pressing [ENTER]. This allows a

Hi/Lo reset without going back through the DISPLAY menu.

If the pressure measurement unit, mode (gauge or absolute) or range is

changed while the HI/LO DISPLAY is active, Hi/Lo resets.

3. OPERATION

To go to a DISPLAY other than HI/LO, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.2.6).

3.2.6.6 FREEZE

 PURPOSE

See Section 3.2.6.

 OPERATION

To activate the FREEZE DISPLAY press [DISPLAY] and select <6Free>. Selecting <6Free> returns to the main run screen with the FREEZE DISPLAY active.

With the FREEZE DISPLAY active the main run screen is:

* 99.1135 psi a zH3

To activate the FREEZE DISPLAY.

1. Pressure measured by active range of RPM3 when [ENTER] was pressed in the current pressure units (displays 0.00 by default when Freeze DISPLAY is first activated).

99.2133

Pressing [ENTER] causes the current pressure measured by the active RPM3 range to be captured and displayed.

If the pressure measurement unit, mode (gauge or absolute) or range is

changed while the FREEZE DISPLAY is active, the Freeze value defaults back to zero.

To go to a DISPLAY other than FREEZE, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.2.6).

3.2.6.7 CLEAN

 PURPOSE

To activate the CLEAN DISPLAY.

See Section 3.2.6.

 OPERATION

To activate the CLEAN DISPLAY press [DISPLAY] and select <7Clean>. Selecting <7Clean> returns to the main run screen with the CLEAN DISPLAY active.

RPM3™ OPERATION AND MAINTENANCE MANUAL

With the CLEAN DISPLAY active the main run screen is:

1. Conventional main run screen first line.

2. “Clean” second line.

* 99.1135 psi a zH3

To go to a DISPLAY other than CLEAN, press [DISPLAY] and make a new

DISPLAY choice (see Section 3.2.6).

3.2.7 [HEAD]

 PURPOSE

To cause a pressure value representing a difference in height to be added to the pressure measured by the RPM3 reference pressure transducer (RPT).

 PRINCIPLE

RPM3’s RPTs measure gauge or absolute pressure at the height of the rear panel TEST port. Frequently, when performing a calibration or test, the device or system under test is at a different height than the RPM3’s TEST port. This difference in height, frequently called head, can cause a significant difference between the pressure measured by the RPM3 at its TEST port height and the pressure actually applied to the device under test located at a different height. In this case, it is useful to make a head correction to the pressure measured by the RPM3 RPT at its TEST port in order to accurately predict the pressure actually applied at a different height. The HEAD function allows head corrections to be applied automatically for a variety of fluids based on operator entry of the nature of the pressurized fluid and the height difference.

RPM3 can accurately determine head pressures for gas (nitrogen, helium and air) and liquids (oil, water) as the pressurized medium. In calculating the head value, standard gravity (9.80665 m/s2) is used. Gas densities are calculated from standard density correcting for temperature of 20 °C and the measured pressure using the gas’s compressibility factor to 1 500 psi (10 MPa) and extrapolated above 1 500 psi. Above 1 500 psi, gas heads should be minimized to minimize uncertainties due to head corrections. Oil density is taken at 850 kg/m3, the density of typical calibration oils at 20 °C. Water density is taken at

998.2321 kg/m3 (20 °C). A custom liquid density may also be specified.

The HEAD function key is used to specify the difference between the RPM3 TEST port and the test height. The height units and the head fluid are specified by pressing [SETTINGS] and selecting <1Head> (see Section 3.3.1).

Use of the HEAD function to assure in tolerance measurements when gas is the test

fluid is most important at low absolute pressures. In this case, specifying the head height within ± 4 in. (10 cm) is adequate to assure that, even in the worst case, the uncertainty on the head correction will be insignificant relative to the tolerance on the RPM3 measurement. Use of the HEAD function to assure in tolerance measurements is particularly critical when a liquid is the test fluid due to the high density of liquids. To determine when and how precisely a head correction for liquids must be made,

0.03 psi/inch (90 Pa/cm) may be used as an estimation of the liquid head value.

3. OPERATION

 OPERATION

To access the HEAD function, press [HEAD]. The display is:

Edit head height:

1. Test fluid currently specified for the head correction.

2. Entry field for head height (1 to 999 cm or in).

5 cm N2

Entering a value of zero turns the HEAD function OFF. Entering a value other than zero turns the HEAD function on using the height entered. Pressing [ESCAPE] returns to the main run screen with NO change to the current head setting.

The reference height of the RPM3 pressure measurement is the middle of the RPM3 TEST

port. The head height should be entered as a positive value if the device or system under test is higher than the RPM3 and negative if it is lower.

The HEAD function is NOT range specific. The HEAD ON or OFF status remains the same

as ranges are changed; edits made to the head specifications are independent of range.

When the HEAD function is ON (head value ¹0), this is indicated by <h> in the right side

of the top line of the main run screen (see Section 3.1.1). When the HEAD function is OFF, the <h> is NOT shown.

To change units of head height between inches

and centimeters and to change the test gas species, press [SETTING] and select <1Head> (see Section 3.3.1).

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

Reference

Level

(TEST Port)

3.2.8 [SDS] (SELF DEFENSE SYSTEM)

 PURPOSE

To activate SDS on all reference pressure transducers (RPTs). To defeat SDS on the

active RPT.

SDS is present only on RPTs designated A1500 or lower.

The [SDS] key should be used with care to avoid accidentally overpressuring an RPT.

Always double check to ensure that the pressure applied to the RPT TEST port is lower than the maximum pressure acceptable to the RPT before defeating SDS.

RPM3™ OPERATION AND MAINTENANCE MANUAL

 PRINCIPLE

SDS is a self defense system to protect RPM3 RPTs from overpressure.

When SDS is ON for an RPT, that RPT is isolated from the TEST port and opened to the VENT port. When SDS is ON, the RPT cannot measure the pressure connected to the TEST port so SDS must be defeated TEST port pressure can be measured by the RPT. The SDS function key allows SDS on the active RPT to be defeated.

The SDS function can also be used to turn SDS ON as might be desired when leaving RPM3 at rest or when a possible overpressure situation is anticipated. Pressing [SDS] always turns on any SDS systems that are OFF.

See Section 3.1.2.6 for additional information on the SDS system and Section 1.2.3 for

schematics of SDS configuration.

SDS ON is indicated by <***SDS***> flashing in the current measured pressure display

field. When SDS is ON, the RPT is isolated from the TEST port and the displayed pressure is the pressure at the VENT port.

 OPERATION

Though the SDS self defense system includes features to protect RPTs against

overpressure, SDS should NOT be considered a fail-safe overpressure protection system. SDS cannot guarantee that overpressure damage will NOT occur. SDS automatic activation may protect an RPT in case of accidental overpressure but conventional measures for protecting against overpressure should always be followed. Damage to RPTs due to overpressure is NOT covered by the RPM3 product warranty even when SDS is present.

The maximum pressure that should be applied to an RPM3 test port when SDS is ON is

2 000 psi (13 MPa).

When SDS is turned on with a pressure applied, a valve shuts isolating the RPT from the

TEST port. A second valve vents the RPT to atmosphere through the VENT port. If the pressure applied at the time SDS is turned ON is less than 250 psi (1 700 kPa), the VENT valve will open causing sudden release of pressure through the VENT port and returning the RPT to atmospheric pressure. If the pressure applied at the time SDS is turned ON is greater than 250 psi, the VENT valve may NOT open. In this case, to vent the RPT, remove the pressure from the test port. This will cause the SDS TEST port isolation valve to open partially, reducing pressure under 250 psi at which time the SDS VENT valve will open.

Pressing [SDS] always turns ON any SDS system that is OFF. In a dual RPT RPM3, even

if the active RPT has NO SDS, pressing [SDS] will turn SDS ON for the inactive RPT if SDS is present.

3. OPERATION

Use [SDS] to defeat SDS if it is ON for the active RPT and/or to turn SDS ON for the active and inactive RPT if present.

When [SDS] is pressed, there are three possible results depending whether the active RPT is SDS equipped and, if so, whether SDS is OFF or ON.

1. If the active RPT IS NOT SDS equipped: <No SDS on RPT> is displayed for 5 seconds

and operation returns to the main run screen.

2. If the active RPT IS SDS EQUIPPED and SDS on the active RPT is OFF: SDS is

turned ON and operation returns to the main run screen.

3. If the active RPT IS SDS EQUIPPED and SDS on the active RPT is ON.

The opportunity to defeat SDS is presented. The display is:

1. Maximum acceptable pressure (Pmax!) for active range (always absolute on an absolute RPT and gauge on a gauge RPT).

Pmax! 510 psi a H3

efeat SDS? 1no 2yes

Check that the pressure applied to the TEST port does NOT exceed the Pmax! value for the active range. Select <1no> to return to the main run screen without defeating SDS. Select <2yes> to defeat SDS and return to the main run screen with SDS defeated (the active RPT open to the TEST port).

Defeating SDS with a pressure greater than Pmax! applied to the test port may cause

overpressure damage to the RPT.

The SDS key is also the [2] key which is pressed to select <2Yes> to defeat SDS. Thus,

SDS can be defeated by two rapid presses of the SDS function. Use this feature to conveniently defeat SDS but always check that the pressure connected the TEST port does NOT exceed Pmax! before doing so.

When changing ranges changes the active RPT, SDS is automatically turned ON for the

RPT that is being changed from, leaving the inactive RPT with SDS ON.

Direct control over SDS for both the Lo and Hi RPTs if present, regardless of which RPT is

currently active, is provided by pressing [SPECIAL] and selecting <2SDS> (see Section

3.4.2). Direct SDS control should only be used with caution and by qualified operators, as the chances of accidental overpressure to an RPT are increased.

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.2.9 [AutoZ]

 PURPOSE

To run the AutoZ function that rezeros the active range.

See Section 3.4.1 for an explanation of AutoZ principles.

To assure operation within “with autozero” measurement accuracy specifications

(see Section 1.2.2), AutoZ should be run regularly to update the value of ZOFFSET. For absolute measurement mode, it is recommended that AutoZ be run at least every 30 days or when RPM3 has been exposed to temperature changes

exceeding ± 20 ºC (36 ºF). For gauge measurement mode, it is recommended that AutoZ be run each time the range or measurement mode is changed and each time the RPT is known to be in a vented condition.

 PRINCIPLE

Run AutoZ is the function by which the current RPT reading is compared to ZSTD and a new value of ZOFFSET representing RPT zero drift is determined and applied (see Section 3.4.1).

 OPERATION

To run AutoZ, press [AutoZ] from the main run screen. If the measurement mode of the active range is gauge, ZSTD is atmospheric pressure (zero gauge) and AutoZ runs automatically (see Section 3.2.9.1). If the measurement mode of the active range is absolute, the source of ZSTD must be specified when AutoZ is run (see Section 3.2.9.2).

Run AutoZ and the value of ZOFFSET that it updates are specific to each range and

operating mode (gauge or absolute).

3.2.9.1 RUNNING AUTOZ IN GAUGE MEASUREMENT MODE

 PURPOSE

To rezero, redetermine ZOFFSET, for the active RPT and range in gauge measurement mode.

See Section 3.4.1 for an explanation of AutoZ principles.

 OPERATION

For the AutoZ function key to run AutoZ, AutoZ must be turned ON for the

active range and measurement mode. AutoZ ON is indicated by <z> displaying to the left of the range designator on the first line of the main run screen. AutoZ ON and OFF is set by pressing [SPECIAL] and selecting <1AutoZ> (see Sections 3.4.1 and 3.4.1.1). If AutoZ is OFF for the active range, and measurement mode, <AutoZ disabled> is displayed when [AutoZ] is pressed.

3. OPERATION

To run AutoZ in gauge measurement mode, press the [AutoZ] function key from the main run screen. <Running gauge AutoZ> is displayed briefly before returning to the main run screen.

Before running AutoZ in gauge mode, ensure that the pressure applied to

the RPT is truly zero gauge (atmospheric pressure). For very low gauge pressure ranges, better results may be obtained by connecting the TEST port to the TEST (-) port to be sure that the differential is truly zero. If running AutoZ in gauge mode results in a zero offset that RPM3 considers unusually large, <Confirm 0 gauge P!> is displayed when [AutoZ] is pressed. Check that the TEST port (and TEST (-) port if the RPT is a gauge RPT) are fully open to atmosphere and press [ENTER] to continue or [ESCAPE] to abort. Running AutoZ without zero applied to the RPT may result in out of tolerance measurements.

If a HEAD correction is active as indicated by <h> in the first line of the

display, RPM3 may NOT indicate zero even right after running AutoZ in gauge mode. The head correction is momentarily disabled when AutoZ is run. The value displayed just after RPM3 is zeroed is the value of the current head correction which is the pressure applied at the head height when the pressure at the RPM3 reference level is zero gauge (see Section 3.2.7).

3.2.9.2 RUNNING AUTOZ IN ABSOLUTE MEASUREMENT MODE

 PURPOSE

To rezero (redetermine ZOFFSET) for the active RPT and range in absolute measurement mode.

See Section 3.4.1 for an explanation of AutoZ principles.

 OPERATION

For the AutoZ function key to run AutoZ, AutoZ must be turned ON for the

active range and measurement mode. AutoZ ON is indicated by <z> displaying to the left of the range designator on the first line of the main run screen. AutoZ ON and OFF is set by pressing [SPECIAL] and selecting <1AutoZ> (see Section 3.4.1.1). If AutoZ is OFF for the active range, and measurement mode, <AutoZ disabled> is displayed when [AutoZ] is pressed.

RPM3™ OPERATION AND MAINTENANCE MANUAL

To run AutoZ in absolute measurement mode, press [AutoZ] from the main run screen. The display is:

1. Active range.

2. Current measurement mode (gauge or abs for absolute).

3. Selection of source of ZSTD for ZOFFSET determination.

AutoZ H3 abs by:

1Entry 2COM2 3RngL3

|__________________ _________________|

Selecting <1Entry> allows the value of ZSTD to be entered from the front panel keypad (see Section 3.2.9.2).

Selecting <2COM2> allows the value of ZSTD to be read automatically from an RPM1, RPM2 or RPM3 connected to RPM3’s COM2 serial port (see Section

3.2.9.2).

Selecting <3RngL3> allows the value of ZSTD to be read automatically from the Lo RPT Range 3 (available only if the active RPT is a Hi absolute RPT and there is a Lo absolute RPT) (see Section 3.2.9.2).

Allow the RPM3 to stabilize at atmospheric pressure and ambient

temperature for 5 to 10 minutes before running AutoZ in absolute mode.

If running AutoZ results in values of ZOFFSET that are greater than ± 0.01 %

FS (± 0.05 % FS for b Type RPTs) of the active RPM3 measurement range, the RPM3 and/or the source of ZSTD may be out of tolerance or the AutoZ process may have been faulty. Before activating a new ZOFFSET greater than ± 0.01 % FS (± 0.05 % FS for b Type RPTs) of the active RPM3 range, check to be sure that both the RPM3 and the source of ZSTD were in good working order, properly vented to stable atmospheric pressure, at the same height, and reading in the same pressure units when AutoZ was run.

When the run AutoZ selection is made, if a HEAD correction is currently

The value of ZOFFSET in absolute mode is NOT necessarily be exactly equal

Run AutoZ by Entry

AutoZ by entry allows the value of ZSTD (see Section 3.4.1) to be entered manually. This provides a simple way of autozeroing relative to an independent reference device such as a house barometer that does NOT interface directly with RPM3.

active (see Section 3.2.7), the head correction is temporarily disabled to avoid “zeroing out” the head correction.

to the difference between the current reading and ZSTD if ZNATERR is NOT zero (see Section 3.4.1). For the same reason, RPM3 may NOT read exactly the same value as ZSTD even right after AutoZ has been run.

3. OPERATION

To access run AutoZ by entry press [AutoZ] from the main run screen while in absolute measurement mode. Then select <1Entry>. The display is:

1. Pressure reading, units and mode of the active RPT range.

2. Active range indicator.

3. Entry field for the value of ZSTD.

Enter the value of ZSTD in the current units. The next display is:

14.104 psi a H3

ZSTD: 0.0000

Old ZOFFSET: 0.0 Pa

New ZOFFSET: 6.5 Pa

The old ZOFFSET is the ZOFFSET currently used.

The new ZOFFSET is the ZOFFSET resulting from this execution of run AutoZ.

Press [ENTER] to activate the new ZOFFSET and return to the main run screen.

Press [ESCAPE] to maintain the old ZOFFSET and return to the main run screen.

The value of ZOFFSET is always displayed and entered in Pascal (Pa).

The value of ZSTD must be entered in the current pressure units or the

calculation of ZOFFSET will be incorrect.

Run AutoZ by COM2

AutoZ by COM2 allows the value of ZSTD (see Section 3.4.1) to be read automatically from a DHI RPM1, RPM2 or RPM3 connected by RS-232 interface to the RPM3 COM2 port.

To access <run AutoZ by COM2>, press [AutoZ] from the main run screen while in absolute measurement mode. Then select <2COM2>. The display is:

1. Pressure reading, units and mode of the active RPT range.

2. Active range indicator.

3. Pressure reading of the RPM connected to RPM3’s COM2 port.

When ready, press [ENTER]. The next display is:

14.104 psi a H3

ZSTD: 14.102

Old ZOFFSET: 0.0 Pa

New ZOFFSET: 13.8 Pa

The old ZOFFSET is the ZOFFSET currently used.

The new ZOFFSET is the ZOFFSET resulting from this execution of run AutoZ.

Press [ENTER] to activate the new ZOFFSET and return to the main run screen.

RPM3™ OPERATION AND MAINTENANCE MANUAL

Press [ESCAPE] to maintain the old ZOFFSET and return to the main run screen.

For RPM3 to communicate with an RPM connected to its COM2 port, the

RPM3 and the RPM RS-232 interfaces must be set up properly (see Section

3.4.4). If the RPM3 is unable to locate an RPM ON COM2 when running AutoZ by COM2, it times out after 6 seconds and displays <RPM NOT detected>.

The value of ZOFFSET is always displayed and entered in Pascal (Pa).

Run AutoZ by RngL3

The AutoZ by RngL3 choice is only available if the active RPT is an absolute, Hi RPT and there is also an absolute Lo RPT in the RPM3. Run AutoZ by RngL3 allows AutoZ to be run on a Hi RPT range using Lo RPT range 3 (L3) as the source of ZSTD (see Section 3.4.1).

To access <run AutoZ by RngL3>, press [AutoZ] from the main run screen while in absolute measurement mode. Then select [3RngL3]. The display is:

1. Pressure reading, units and mode of the active Hi RPT range.

2. Active range indicator.

3. Pressure reading of Lo RPT range 3 (L3).

When ready, press [ENTER]. The next display is:

14.104 psi a H3

ZSTD: 14.102

Old ZOFFSET: 0.0 Pa

New ZOFFSET: 13.8 Pa

The old ZOFFSET is the ZOFFSET currently used.

The new ZOFFSET is the ZOFFSET resulting from this execution of run AutoZ.

Press [ENTER] to activate the new ZOFFSET and return to the main run screen.

Press [ESCAPE] to maintain the old ZOFFSET and return to the main run screen.

Before running AutoZ by Lo RPT, be sure that range L3 of the Lo RPT is

correctly calibrated and autozeroed.

If you are running AutoZ on the Hi and Lo RPTs of an RPM3 and using run AutoZ

The value of ZOFFSET is always displayed and entered in Pa.

by RngL3 to autozero the Hi RPT, be sure to run AutoZ on the Lo RPT first.

3. OPERATION

3.3 [SETUP] MENU KEY

 PURPOSE

The [SETUP] key accesses a menu of commonly used RPM3 functions and features that do NOT have direct function keys.

Select <Head> To change the height units and fluid (see Section 3.3.1)

Select <PresU> To customize the choices available under [UNIT] and to set up User Defined Units

(see Section 3.3.2)

Select <ReadRt> To turn ON and OFF RPM3’s automated, rate of change dependent, reading

integration time feature (see Section 3.3.3)

Select <Stab> To view and adjust the stability limit that is the criterion for the Ready (<*>)/Not Ready

> or < >) condition (see Sections 3.3.4 and 3.1.2.4)

Select <Leak> To run an automated leak checking function (see Section 3.3.5)

 OPERATION

To access the SETUP menu, press [SETUP] from the main run screen. The display is:

3.3.1 HEAD

 PURPOSE

To specify the configuration of the HEAD function (see Section 3.2.7) including the length unit of measure for head height entry and the test fluid for head pressure calculations.

 OPERATION

From the main run screen, press [SETUP] and select <1Head>. The display is:

Select the desired head height unit. The next display is:

If <1Gas> is selected, the display offers the choice of three gasses. Making a gas selection returns to the main run screen with that gas active for the HEAD function.

If <2Liquid> is selected the display offers the choice of oil, water or a user defined liquid. If the user defined liquid is selected, its density must be specified. Making a liquid selection returns to the main run screen with that liquid active for the HEAD function.

1Head 2PresU 3ReadRt

Stab 5Leak

Head height unit:

in 2cm

Head medium:

Gas 2Liquid

Gas type:

N2 2He 3Air

Liquid type:

Oil 2H2O 3User

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.3.2 PRESU

 PURPOSE

To customize the selection of pressure units that are available for selection from the UNIT function key.

 PRINCIPLE

The UNIT function key makes available a choice of six default pressure units (US or SI depending on whether the RPM3 has been factory set as US or SI) (see Section 3.2.2). RPM3 also supports many commonly used units in addition to those included in the default set up. These units can be made available for active selection by customizing the UNIT function by pressing [SETUP] and selecting <2PresU>. This allows RPM3 to offer a very wide selection of units while simplifying day to day operation. The typical user will customize the UNIT function key to support his/her six most commonly used units.

 OPERATION

To customize the UNIT function key, from the main run screen press [SETUP] and select <2PresU>. The display is:

1. Entry field to select which unit position (1 to 6) of the UNIT function key menu is to be changed.

Set up user unit #6

Enter the number of the unit position that you would like to change. The display becomes:

Unit #6 1SI 2Other

Altitude 4User

Select the desired pressure unit category (SI units include units based on SI such as mmHg), then select the desired unit from the unit menu.

Table 11 PresU - Available Units

1SI 2other 3altitude 4user

1Pa

2kPa

3mPa

4mbar

5bar

6mmHg

7mmWa

1psi

2psf

3inHg

4inWa

5kcm2

1feet

2meters

1user

If <4user> was selected, the user unit must be defined. The display is:

Define user unit:

.000000 Units/Pa

1. Entry field.

Enter the number of user units per Pascal (Pa) in the entry field. Pressing [ENTER] defines the user unit and returns to the <Set up unit #> screen.

3. OPERATION

The user defined unit can be assigned a user defined label using the UNIT: USER remote

command (see Section 4.4.2.).

See Section 7.1 for the pressure unit conversion factors used by RPM3.

3.3.3 READRT (READ RATE)

 PURPOSE

To turn ON and OFF RPM3’s automated, rate of change dependent, reading integration rate feature.

 PRINCIPLE

To obtain maximum resolution from RPM3 RPT pressure measurements, an integration time of about 1 second per reading is used. In most situations, maximum accuracy is needed when pressures are stable so a relatively slow reading rate presents NO disadvantage. However, when pressure is changing quickly, more rapid pressure updates are usually more important than obtaining maximum accuracy on individual readings. The RPM3 read rate function automatically adjusts pressure measurement integration time depending on the rate of change of pressure. When pressure is changing rapidly, reading rate is increased. When pressure is evolving slowly, reading rate is decreased and maximum accuracy is obtained.

When the automated read rate function is ON, three pressure rate of change dependent read rates are used. The result is three display update rates:

Table 12 READRT - Display Update Rates

PRESSURE

RATE OF CHANGE

> 3 % FS/s

> 0.5 and < 3 % FS/s

< 0.5 % FS/s

DISPLAY

UPDATE

≈ 0.2 s

≈ 0.5 s

≈ 1 s

For situations in which an evolving reading rate is NOT desired, the RPM3 automated read rate function can be turned OFF. In this case, the reading rate is always the high resolution rate of about 1 reading per second.

 OPERATION

To turn the automated read rate function ON or OFF press [SETUP] and select <3ReadRt>.

Auto read rate: H3

The display is:

no 2yes

The cursor is on the current selection.

Selecting <1on> activates the automated reading rate and returns to the main run screen. Selecting <2off> turns OFF the automated reading rate and returns to the main run screen.

The default RPM3 condition is auto read rate ON.

Auto read rate ON/OFF is NOT range specific. Turning auto read rate ON or OFF in one

range turns it ON or OFF for all RPM3 ranges.

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.3.4 STAB (STABILITY)

 PURPOSE

To view and/or adjust the stability test that is the Ready (See Section 3.1.2.4.)/Not Ready (<

↑> or <↓>) criterion for the active RPT and range.

See Section 3.1.2.4.

 PRINCIPLE

RPM3 continuously monitors the rate of change of pressure measured by the active RPT and range and compares this rate to the stability limit to make a Ready (<*>)/Not Ready (<

determination (see Section 3.1.2.4). The stability function allows the stability limit to be adjusted by the user to increase or decrease the stability required for a Ready <*> condition to occur.

The default stability limit is ± 0.005 % FS of the active range.

↑> or <↓>)

The stability limit is separate and different from the Rate DISPLAY function (see Section

3.2.6.2) which allows the current rate of change of pressure to be displayed.

 OPERATION

To adjust the stability limit press [SETUP] and select <4Stab>. The display is:

Stability limit: H3

1. Entry field for setting the desired stability limit. Recalls the default stability limit or the last custom stability limit for the active range in the current pressure units for that range.

.0015 psi/s

Edit the desired stability limit setting if desired. Pressing [ENTER] activates the stability limit for the range and returns to the main run screen.

The stability setting is range specific. Changes made in one range do NOT affect any

other range.

3.3.5 LEAK (LEAK CHECK)

 PURPOSE

To run an automated leak check routine using RPM3 to measure the total pressure change and average rate of change over a period of time; to edit the leak check time.

 PRINCIPLE

The Leak Check function is provided to assist in using RPM3 to measure leaks by measuring pressure changes.

The principle of the Leak Check function is the measurement of pressure increase or decrease. The Leak Check function allows a leak check time to be set. The total pressure change and the average rate of change over the leak check time are calculated and displayed.

3. OPERATION

Changing the pressure in a test system causes adiabatic temperature changes in the gas

that need to have dissipated before a valid leak measurement can be made. In general, a 0.5 to 1 minute wait before running a leak check is adequate to allow the adiabatic temperature change to dissipate and valid leak measurements to be made. However, stabilization time may be much longer with liquid test media, as volumes increase and as pressures increase.

 OPERATION

To access the LEAK function press [SETUP] and select <5Leak>.

Leak Check H3

The display is:

run 2view

Select <2view> to view the results of the last leak check executed. Results screen displays <Data NOT available> briefly and returns to main run screen if NO leak check data is stored

(e.g., if the RPM3 has never run a leak test or a reset has cleared previous leak test results). Pressing [ENTER] or [ESCAPE] returns to the main run screen.

Leak check is range specific in the sense that leak check is run using the active range.

However, only one set of leak check results is maintained in memory and each leak test completed overwrites the memory. View leak check always shows the results of the last leak check run regardless of the range that is now active. The results screen includes the range indicator to indicate the range in which the leak check was run.

Select <1run> to run a leak check and/or to edit the leak check time. The display is:

Set leak check time:

5 s

1. Edit field for leak check time in seconds (1 min, 999 max).

Edit the leak check time if desired. Press [ENTER] to run leak test. The display is:

1. Standard main run screen first line.

2. Indication that leak test is running and countdown of time remaining(s).

99.1135 psi a zH3

Leak testing 13 s

Pressing [ESCAPE] during the countdown offers a leak check abort option to return to the main run screen or continue leak test. Pressing [ENTER] during the leak check countdown causes the countdown to reset to start.

RPM3™ OPERATION AND MAINTENANCE MANUAL

Once the leak check countdown has completed, the results screen is displayed:

1. Net change in pressure over the leak check time period.

2. Indicator of range in which leak check was run.

3. Average rate of change of pressure over the leak check time period.

ΔP 0.0035 psi H3

Rate –0.0002 /sec

Pressing [ENTER] from the leak check results screen following execution of a leak check starts a new leak check routine directly without having to go through the leak check menu. Pressing [ESCAPE] returns to the main run screen.

Pressing [ENTER] while counting down a leak check or when in leak check results screen

starts a new leak check sequence.

3.4 [SPECIAL] MENU KEY

 PURPOSE

Pressing [SPECIAL] accesses a menu of RPM3 functions and settings that are less commonly or NOT normally used in regular operation. These include:

Select <AutoZ> Turn AutoZ ON/OFF, view and edit ZOFFSET values (see Section 3.4.1)

Select <SDS> Turn SDS ON/OFF independently of the [SDS] key (see Sections 3.1.2.6 and 3.4.2)

Select <ATM> View the current reading of the on-board barometer (see Section 3.4.3)

Select <Remote> Set up RPM3 serial and GPIB (IEEE-488) interfaces (see Section 3.4.4)

Select <Reset> Access and execute a number if reset options (see Section 3.4.5)

Select <Cal> View and adjust RPM3 RPT and barometer calibration coefficients (see Sections 3.4.6 and 5.2)

Select <Intern> View and set screen saver, keypad sounds, time and ID features (see Section 3.4.7)

Select <Level> View and change User Level protection of RPM3 functions (see Section 3.4.8)

Select <Log> View the RPM3 incident log (see Section 3.4.9)

 OPERATION

To access the SPECIAL menu, press [SPECIAL] from the main run screen.

1AutoZ 2SDS 3Atm

The display is:

4Remote 5Reset 6Cal

Prefs 8Level 9Log

Some screens, such as the SPECIAL menu go beyond the two lines provided by the display. This is

indicated by a flashing arrow in the second line of the display. Use the [ ] and [ ] keys to move the cursor to access the lines that are NOT visible or directly enter the number of the hidden menu choice if you know it.

3. OPERATION

3.4.1 AUTOZ

 PURPOSE

To manage the AutoZ function for the active RPT and range including turning AutoZ ON/OFF, viewing and editing AutoZ values.

To run AutoZ (rezero), use the [AutoZ] direct function key (see Section 3.2.9).

 PRINCIPLE

How AutoZ Works

The main component of the change over time of the RPM3 RPTs is zero drift or offset, independent of span. Rezeroing RPM3 RPTs relative to a stable reference between recalibrations allows higher measurement accuracy specifications to be maintained with a longer interval between full recalibrations. The RPM3 autozero function (AutoZ) provides full on-board support for the rezeroing process to simplify its application by the user.

The autozeroing function uses four parameters:

1. ZSTD: The value of the autozero pressure as indicated by the reference autozero device.

For absolute RPTs in absolute measurement mode

: The autozero pressure is always

atmospheric pressure and the ZSTD value can be supplied in one of three ways:

a) By manual entry

b) From a DHI RPM connected to the RPM3 COM2 port

c) From a Lo absolute RPT if one is available

For gauge RPTs or absolute RPTs in gauge measurement mode

: The autozero pressure is always zero (atmospheric pressure) which is available by definition any time the RPT is vented to atmosphere.

2. ZCURERR: The difference between ZSTD and the RPT indication at the autozero

pressure at some time after the RPT has been calibrated (ZCURERR = RPT reading w/out ZOFFSET- ZSTD).

3. ZNATERR: The difference between ZSTD and the RPT indication at the autozero

pressure just after the RPT has been calibrated (ZNATERR = RPT reading w/out ZOFFSET - ZSTD). This value, when measured just after RPT calibration, is referred to as the natural error at the autozero pressure. Because NO RPT is perfectly linear and ZSTD is NOT perfectly accurate, the disagreement between the RPT reading and ZSTD at the autozero pressure is unlikely to ever be zero (except for gauge RPTs for which the zero point is forced at calibration).

4. ZOFFSET: ZCURERR corrected for ZNATERR, represents the drift of the RPT relative to the reference (ZOFFSET = ZCURERR - ZNATERR). The active RPT reading, adjusted by ZOFFSET, is the autozeroed RPT reading (e.g., the RPT reading corrected for zero drift since it was calibrated). For an absolute RPT used in gauge mode, ZOFFSET also includes the value of atmospheric pressure that is being subtracted to arrive at gauge pressure.

The AutoZ function manages the determination, storage and application of ZNATERR and ZOFFSET individually for each RPM3 range and measurement mode. ZNATERR error is determined at the time of calibration (see Section 5.2). ZCURRERR and ZOFFSEST between calibrations are determined by running AutoZ using the [AutoZ] direct function key (see Section 3.2.9).

RPM3™ OPERATION AND MAINTENANCE MANUAL

AutoZ On/Off

The AutoZ function can be turned ON and OFF. When AutoZ is ON, ZOFFSET is always applied to the pressure measured by RPM3 and new values of ZOFFSET can be determined by running AutoZ using the [AutoZ] key. When AutoZ is OFF, ZOFFSET is NOT applied (except for an absolute RPT in gauge mode for which ZOFFSET is the current value of atmospheric pressure which is always subtracted to achieve gauge pressure) and AutoZ cannot be run (see Section 3.4.1.1). In gauge mode, turning AutoZ OFF turns OFF the dynamic compensation for atmospheric pressure.

Gauge Mode with an Absolute RPT, Dynamic Compensation for Atmospheric Pressure

RPM3 supports gauge pressure measurements with an absolute RPT by subtracting the value of atmosphere (tare) from the RPT’s absolute measurement to arrive at a gauge value. The appropriate tare value changes with the natural evolution of atmospheric pressure at a given location. For this reason, the value of the tare should be redetermined by running AutoZ (see Section 3.2.9) each time the RPT is vented to atmospheric pressure. However, if atmospheric pressure changes significantly between vented conditions, these changes in atmospheric pressure are NOT eliminated by retaring. To compensate for changes in atmospheric pressure between autozeroing (taring) opportunities, dynamic atmospheric pressure compensation is used.

To minimize zero errors due to the evolution of atmospheric pressure between taring opportunities when using an absolute RPT in gauge measurement mode, RPM3 dynamically compensates the atmospheric tare value. RPM3’s on-board barometer measures atmospheric pressure independently from the RPT. Between opportunities to update the tare value (vented conditions), the difference between the on-board barometer reading at the time of the last tare value and the current on-board barometer reading is used to compensate the tare value. This difference is called ATMOFFSET. This dynamic atmospheric compensation technique, which relies only on the resolution and short term stability of the on-board barometer (NOT its absolute accuracy or long term stability), allows gauge measurements with an absolute RPT with an additional uncertainty due to possible changes in atmospheric pressure of only ± 0.00035 psi (2.5 Pa).

When using an absolute RPT to make low gauge mode measurements, the limit in

resolution of the on-board barometer used for dynamic compensation for atmospheric pressure may cause distortion of the results. For best results when using an absolute RPT in gauge mode under 7 psi (50 kPa) consider turning the AutoZ function OFF (see Section 3.4.1.1) to eliminate the effect of the dynamic compensation system and rezero (run AutoZ) RPM3 often to keep the atmospheric tare value current (see Section 3.2.9).

Recommendations for the Use of the AutoZ Function

The AutoZ function provides a powerful and easy to use tool for improving the measurement accuracy specifications of an RPM3 and reducing the calibration recall interval by compensating for zero drift between full recalibrations. The following simple recommendations will help assure that you use this feature to best advantage.

• Always leave AutoZ ON when operating in the gauge measurement mode. The only possible exception is when using an absolute RPT in gauge mode at pressures under 7 psi (50 kPa) (see note above).

• Always leave AutoZ ON when operating in the absolute measurement mode if ZNATERR was set properly at calibration and the AutoZ routine using a valid atmospheric reference has been run regularly.

• Execute the run AutoZ routine in absolute mode only when a reference whose accuracy is known to be significantly better than that of the RPM3 RPT is available. Keep range ratios in mind when comparing accuracy. A ± 0.01 % FS barometer is roughly 10 times more accurate than a ± 0.01 % FS 150 psi (1 MPa) RPT range because the RPT/barometer range ratio is 10:1.

3. OPERATION

• If possible, allow the RPM3 to stabilize at atmospheric pressure and ambient temperature for 5 to 10 minutes before running AutoZ in absolute mode.

• In gauge mode, run AutoZ every time RPM3 is vented.

 OPERATION

The AutoZ function and values are range AND mode (gauge or absolute) specific.

To access the RPM3 AutoZ function press [SPECIAL] and select <1AutoZ>. The display is:

1off 2view H3

edit

Select <1off> (or <1on>) to change the AutoZ status for the active range and measurement mode from ON to OFF or vice-versa (see Section 3.4.1.1).

Selecting <2view> allows the current value of ZOFFSET for the active range and measurement mode to be viewed.

Selecting <3edit> allows the current value of ZOFFSET for the active range and measurement mode to be edited.

3.4.1.1 AUTOZ ON/OFF

To turn AutoZ ON/OFF for the current range and measurement mode, press [SPECIAL] and select <1AutoZ>.

If AutoZ is OFF for the current range and measurement mode, <1On> is displayed in the menu accessed by pressing [SPECIAL] and selecting <1AutoZ>. Select <1On> to turn AutoZ ON and return to the main run screen.

If AutoZ is ON for the current range and measurement mode, <1Off> is displayed in the menu accessed by pressing [SPECIAL] and selecting <1AutoZ>. Select <1Off> to turn AutoZ OFF and return to the main run screen.

AutoZ ON is indicated by a <z> displaying in the main run screen, top line,

third character from the right. When AutoZ is OFF, the character is blank.

In absolute mode (AXXXX RPT), or gauge mode with a gauge RPT (GXXXX RPT),

when AutoZ is OFF the [AutoZ] key is disabled and ZOFFSET is NOT applied.

In gauge mode with an absolute RPT (AXXXX RPT), when AutoZ is OFF the [AutoZ] key is disabled and “dynamic compensation for atmospheric pressure” is OFF. ZOFFSET is still applied to tare out atmospheric pressure.

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.4.1.2 VIEW AUTOZ

To view the current ZOFFSET for the active range and measurement mode press [SPECIAL] and select <1AutoZ>, <2view>. The display is:

1. Current measurement mode.

2. Active range.

3. Display field of current value of ZOFFSET.

ZOFFSET absolute H3

0.0 Pa

ZOFFSET should be zero in absolute mode when the RPM3 is new or has just

been calibrated. ZOFFSET should be roughly equal to atmospheric pressure for an absolute RPT operating in gauge mode.

The value of ZOFFSET is always displayed and entered in Pascal (Pa)

regardless of the current RPM3 measurement unit as RPM3’s internal operations are in Pa.

3.4.1.3 EDIT AUTOZ

The edit AutoZ function should be used with caution as entering

inappropriate values and turning ON AutoZ may result in incorrect autozeroing and out of tolerance measurements. In normal operation, the value of ZOFFSET should be changed using the run AutoZ function (see Section 3.2.9). The only expected use of edit AutoZ is to set ZOFFSET to zero after a calibration of RPM3 RPTs. Before editing ZOFFSET, see Sections 3.4.1 and 5.2.6.

To edit ZOFFSET for the active range and measurement mode press [SPECIAL] and select <1AutoZ>, <3edit>. The display is:

1. Current measurement mode.

2. Active range.

3. Edit field for value of ZOFFSET.

The value of ZOFFSET is always displayed and entered in Pascal (Pa)

ZOFFSET absolute H3

0.0 Pa

regardless of the current RPM3 measurement unit.

3. OPERATION

3.4.2 SDS

 PURPOSE

To view and/or change the status of SDS (ON/OFF) for any SDS equipped RPT independently of the [SDS] direct function key or the active RPT and range.

See also Sections 3.1.2.6, 3.2.8 and 1.2.3 for additional information on the SDS Self

Defense System.

SDS is present only on RPTs designated A1500 or lower.

SDS ON/OFF should be operated with great care to avoid accidentally overpressuring an

RPT. Always double check to ensure that the pressure applied to the RPT test port is lower than maximum pressure acceptable to the RPT before defeating SDS.

 OPERATION

To access the special SDS control function press [SPECIAL] and select <2SDS>.

SDS Control:

The display is:

Hi RPT 2Lo RPT

If this is a single RPT RPM3, this menu is skipped.

Select <1Hi PRT> to control SDS on the Hi RPT or <2Lo RPT> to control SDS on the Lo RPT. If the selected RPT is NOT SDS equipped, a message indicating so displays briefly. If the selected RPT is SDS equipped, the display is:

1. Hi or Lo depending on the RPT selected.

SDS Hi RPT:

off 2on

The cursor is on the number corresponding to the current status of SDS for the selected RPT. Press [ESCAPE] to return to the main run screen without affecting SDS status.

Select <2on> to turn ON SDS ON. SDS turns ON for the selected RPT and operation returns to the main run screen.

Select <1off> to turn SDS OFF. Operation is identical to using the SDS direct function key to defeat SDS (see Section 3.2.8). RPM3 displays the maximum acceptable pressure for the active RPT and range and ask for confirmation that SDS should be defeated. Press [ESCAPE] to return to the main run screen without affecting SDS status.

Defeating SDS with a pressure greater than Pmax! applied to the test port may cause

overpressure damage to the RPT.

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.4.3 ATM

 PURPOSE

To view the value of atmospheric pressure as measured by the on-board barometer.

 PRINCIPLE

RPM3 has an independent on-board barometer connected to the ATM port on the rear panel. The atmospheric pressure measurements made by the on-board barometer are used only for dynamic compensation of atmospheric pressure when using an absolute reference pressure transducer to make gauge pressure measurements (see Section 3.4.1).

See Sections 1.2.2.3 and 5.6.1.7.

The on-board barometer is used only for measuring changes in atmospheric pressure over

short periods of time. RPM3 measurement accuracy does NOT depend on the absolute accuracy of the on-board barometer.

 OPERATION

To view the current reading of the on-board barometer press [SPECIAL] and select <3Atm>. The display is in the current pressure units and current resolution setting of the active RPM3 range.

3.4.4 REMOTE

 PURPOSE

To configure the RPM3 COM1, COM2 and IEEE-488 (GPIB) communication ports. To test COM1 and COM2 communications.

 PRINCIPLE

The RPM3 has two RS-232 communications ports referred to as COM1 and COM2 and a single IEEE-488 (GPIB) port. COM1 or the IEEE-488 port is for communicating with a host computer (see Section 4), and COM2 is reserved for communicating with an external device (e.g., a multimeter, RPM, etc.). These ports can be set up from the RPM3 front panel.

A self test is supplied for RS-232 communications. The self test allows verification that the RPM3 RS-232 ports (COM1 and COM2) are operating properly and that a valid interface cable is being used. The test has two steps. In the first, COM1 sends a message to COM2 and in the second COM2 sends a message to COM1. In each step, RPM3 checks the message received at the receiving COM port. If the receiving COM port times out or receives an incorrect message, that step of the test fails.

 OPERATION

To access the port configurations press [SPECIAL] and select <4Remote>. Select <1COM1>, <2COM2>, or <3IEEE-488> to view and edit that port’s settings. Press [SPECIAL] and select <4Remote>, <4RS232test> to access the RS-232 self test.

1COM1 and 2COM2

The COMx ports can be set for the specific settings required by the user. These settings are baud, parity, length and stop bit. The available options are:

Baud: 300, 600, 1 200, 2 400, 4 800, 9 600, 19 200 Parity: NONE, ODD or EVEN Length: 7 or 8 Stop Bit: 1 or 2

3. OPERATION

The default is 2400, E, 7, 1 for COM1 and COM2.

The RPM3 appends a carriage return and a line feed to all messages that are sent out of the COM1 port to the host. It looks for a carriage return to terminate incoming messages and ignores line feeds. The user MUST wait for a reply to each message sent to the RPM3 before sending another message to it.

3IEEE-488

The IEEE-488 port address can be specified from 1 to 31.

The RPM3 sends a line feed and asserts the EOI line at the end of all transmitted messages. It looks for a line feed and/or assertion of the EOI line to terminate incoming messages.

4RS232 Self Test

The RS-232 Self Test is provided to check the RPM3 COM ports and the interface cable independently of an external device or computer. If you are having difficulty communicating with RPM3 by RS-232 from a computer, the RS-232 self test can help establish that the RPM3 COM1 port you are trying to communicate with and the interface cable you are using are good.

To run a self test of the RS-232 ports (COM1 and COM2) press [SPECIAL] and select <4Remote>, <4RS232test>.

The display prompts you to connect COM1 to COM2 using the appropriate cable (see Section

4.2.1).

Once the connection has been made, press [ENTER] to run the self test. The test is first executed in the COM1→COM2 direction and then in the COM2→COM1 direction. If the COM1→COM2 test passes, <PASSED> displays briefly and the test proceeds to COM2→COM1. If COM2→COM1 passes <PASSED> is displayed briefly followed by the conclusion, <RPM3 RS232 test has PASSED>. If a test fails, execution is suspended until [ENTER] is pressed.

The RPM3 RS-232 test can fail for three reasons: 1) the RS-232 cable being used is

incorrect (see Section 4.2.1 for information on the correct cable); 2) COM1 and COM2 do NOT have the same serial communications settings and therefore cannot communicate together (see Section 3.4.4 to set the COM ports); 3) COM1or COM2 is defective. The reason for failed communications is almost always a cable or RS-232 interface settings problem. Be sure that these are correct before concluding that a COM port is defective.

3.4.5 RESET

 PURPOSE

To reset various RPM3 settings to default or factory values.

RPM3 stores its user definable settings in non-volatile memory. The reset menu allows the user to selectively or completely reset these settings to factory defaults. This clears out any settings that the user has set up, and should be used only to restore the RPM3 to a known state. RPM3 will go through its reboot routine after any type of reset is selected.

 OPERATION

To access the reset choices, select <5Reset> under the [SPECIAL] menu. The display is:

1sets 2units 3com

cal 5all

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.4.5.1 RESET - SETS

 PURPOSE

Clears all of the normal user settings for pressure measurements. This includes:

• Head settings set to disabled with <cm> as the height unit and <N2> as the

medium (see Sections 3.2.7 and 3.3.1)

• Sets the upper limits to factory defaults (see Section 3.2.4)

• Set the stability limits to ± 0.005 % FS (see Section 3.3.4)

• Sets the auto zero ATMSTART measurement to 101.325 kPaa (see Section

3.4.1)

• Enables the auto read rate feature (see Section 3.3.3)

• Sets the resolution to factory defaults (see Section 3.2.5)

• Sets the pressure units to <psi> if the RPM3 is a US version or <kPa/MPa>

if SI (see Section 3.3.2)

• Sets the measurement mode to <absolute> for ranges on absolute RPTs

and <gauge> for ranges on gauge RPTs (see Section 3.2.3)

• Enables auto zero for all ranges and measurement modes (see Section 3.2.9)

• Sets the range to <H3> (see Section 3.2.1)

• Sets the beeper on valid key entry to <MID> (see Section 3.4.7.2)

• Sets the Screen saver period to 10 minutes (see Section 3.4.7.1)

• Clears the previous leak check results (see Section 3.3.5)

3.4.5.2 RESET - UNITS

 PURPOSE

Resets unit and mode settings to defaults.

• Sets the six pressure unit selectable from [UNIT] to defaults (see Section 3.2.2)

• Sets the reference temperature for inches of water to 4 °C

• Sets the user unit coefficient to 1.00/Pa (see Section 3.3.2)

• Sets the active pressure unit to default for all ranges (psi for US RPM3, kPa

or MPa for SI RPM3) (see Section 3.2.2)

• Sets the active measurement mode to default (see Section 3.2.3)

3.4.5.3 RESET - COM

 PURPOSE

Resets communications port settings: COM1 and COM2 set to 2 400, E, 7, 1 using <CR> and <LF> as the terminating characters. The IEEE-488 interface

address is set to <10>.

See Section 3.4.4.

3. OPERATION

3.4.5.4 RESET - CAL

 PURPOSE

Use caution with this reset as critical calibration data may be deleted.

This clears the user calibrations information, which affects the calibration of the unit.

• Clears the user defined RPT calibration coefficients. PA/PM to 0 (zero) and

1 (see Section 5.2)

• Clears the user defined barometer calibration. Sets PA/PM to 0 (zero) and 1

(see Section 5.3)

• Clears the ZNATERR and ZOFFSET values to 0 (zero) (see Section 3.2.9)

3.4.5.5 RESET - ALL

 PURPOSE

To return RPM3 to the as delivered original factory condition. Performs the functions of the Sets, Units, Cal and Com resets. Also resets the user security level to low (see Section 3.4.8).

3.4.6 CAL

To calibrate the RPM3 Hi and Lo RPTs and adjust the on-board barometer. These functions are considered part of RPM3 maintenance and are therefore covered in the maintenance section of this manual (see Sections 5.2 and 5.3).

3.4.7 INTERN

 PURPOSE

To access a menu of RPM3 internal operating preferences and functions.

Select <ScrSvr> View and change the screen saver function (see Section 3.4.7.1)

Select <sounds> View and change valid entry keypad sound settings (see Section 3.4.7.2)

Select <time> View and edit the internal time and date settings (see Section 3.4.7.3)

Select <ID> View the RPM3 serial number, view and edit the ID number (see Section

3.4.7.4)

 OPERATION

To access the Intern menu press [SPECIAL], and select <7Intern>. The display is:

Select <1ScrSvr> To access the screen saver activation time menu (see Section 3.4.7.1).

Select <2sound> To access the keypad sounds choices (see Section 3.4.7.2).

Select <3time> To access the time and date view/edit (see Section 3.4.7.3).

1ScrSav 2sound 3time

Select <4ID> To access the S/N view and the ID view/edit (see Section 3.4.7.4).

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.4.7.1 SCRSAV

 PURPOSE

To adjust the RPM3 screen saver function.

 PRINCIPAL

RPM3 has a screen saver function which causes the display to dim after a front panel key is NOT pressed for a certain amount of time. This function is factory set to activate after 10 minutes of inactivity but can be adjusted by the user.

 OPERATION

To access the screen saver function press [SPECIAL] and select <7Intern>, <1ScrSav>. Edit the time in minutes, after which screen saver will turn ON.

Setting screen saver time to zero eliminates the screen saver function so

that the display remains permanently at full brightness. The display may also be completed suppressed using the soft [ON/OFF] key (see Section 3.1.2.3).

3.4.7.2 SOUND

 PURPOSE

To adjust or suppress the RPM3 keypad valid key press sounds.

 PRINCIPAL

RPM3 provides audible feedback by a brief beep when a valid key press is executed. The frequency of this beep may be selected from three choices or it may be completely suppressed. Invalid key presses are indicated by a descending two tone blurp which cannot be suppressed (see Section 3.1.2.2).

 OPERATION

To access the keypad sound adjustment function press [SPECIAL] and select <7Intern>, <2sound>.

Select between <2lo>, <3mid> or <4hi> to adjust the valid key press tone frequency.

Select <1none> to suppress the valid key press sound.

The sound function only affects the valid key press tone.

3.4.7.3 TIME

 PURPOSE

To view and edit the RPM3 internal time and date settings.

 OPERATION

To access the time function press [SPECIAL] and select <7Intern>, <3time>. The display is:

Select <1time> to edit the time. Edit hours, then minutes, then am/pm by pressing [ENTER] at each entry. Seconds go to zero when minutes are entered.

Select <2date> to edit the date. The date must be specified in YYYYMMDD format.

3. OPERATION

The RPM3 date and time are set to United States Mountain Standard Time

in the final test and inspection process at the factory. If desired, used the date function to set your local time and date.

3.4.7.4 ID

 PURPOSE

To view the RPM3 serial number (SN) and to view or edit the ID number.

 PRINCIPAL

RPM3 has a factory programmed serial number that is included on the product label on the bottom of the case and can be viewed in the ID menu.

RPM3 also allows the user to store a unique alpha numeric ID number. This feature is frequently used to assign and organizational control ID such as an asset number. Tool number, standard number, etc. The ID function allows the ID number to be viewed and edited.

 OPERATION

To access the ID function press [SPECIAL] and select <7Intern>, <4Keypad>. Select <1view> view the current ID and serial number (SN).

Select <2edit> to edit the ID.

The ID has twelve characters. When the edit screen is entered, the cursor is on the first character. Numerical values can be entered directly from the keypad. In addition, the [

] and [ ] keys can be used to toggle through a list of available alpha numeric characters. Holding the key slews through the characters. Character order going up ([

]) is: blank space, symbols, lower

case letters, upper case letters, numbers. Press [ENTER] to select a character and move to the next character.

When a character is selected the cursor moves to the next character. To leave a blank character, [ENTER] with the field for that character blank. Use this for the trailing characters if the ID being entered is less than 12 characters.

After the last of the twelve characters has been entered, the <Save ID?> option is offered. Select <1no> to return to the ID edit screen. Select <2yes> to save the edited ID.

The ID can also be set remotely from a computer which is quite a bit more

convenient than writing it from the keyboard! (see Section 4.4.2.8). ID cannot be cleared or reset by user commands.

RPM3™ OPERATION AND MAINTENANCE MANUAL

3.4.8 LEVEL

 PURPOSE

To set user protection levels to restrict access to certain functions and to edit the password required for changing user levels.

 PRINCIPLE

RPM3’s front panel user interface provides the means to access all RPM3 user defined data, settings and functions including calibration data. Inadvertent, uninformed or unauthorized altering or deleting of data, settings and functions could require extensive reconfiguration by the user and might cause invalid readings or damage to the system. For these reasons, depending upon the application in which RPM3 is being used, it may be desirable to restrict access to certain functions for certain users. The user level function provides a means of restricting access to certain functions. Four different levels of security are available.

Access to changing security levels can be left open, or be protected by a password.

Security Levels

The security levels are structured to support typical operating environments as follows:

None This level is intended for use only by the system manager and/or calibration

facility. It allows access and editing in all areas including critical metrological information.

Low This level of security is designed to protect the specific metrological information

and system diagnostic and maintenance functions of the system. It is intended for an advanced operator performing many different tasks.

Medium This level of security is designed to protect specific metrological information in

the system and to assure that the RPM3 is operated using consistent operational parameters.

High This level of security is designed to protect all operating parameters. It is

intended to minimize operator choices, for example to perform repeated identical tests under consistent conditions.

RPM3 is delivered with the security level set at low to avoid inadvertent altering of critical internal settings but with access to changing security levels unrestricted. It is recommended that the low security level be maintained at all times. If there is a risk of unauthorized changing of the security level, changing authority should be password protected (see Section 3.4.8).

The High security level disables remote communications and returns an error message to

all remote commands. All other security levels have NO effect on remote communications.

The security levels are structured to support typical levels of operation and to prevent execution of the X’d functions as shown in Table 13.

3. OPERATION

Table 13. Functions - Security Levels

FUNCTION LOW MEDIUM HIGH

[RANGE] X [UNIT] X [MODE] X [UPPER LIMIT] (change setting) X [RES] X [RES] (change setting) X X [DISPLAY] X [HEAD] X [SDS] X [AutoZ] (in absolute mode) X X [SETUP], <1Head> X X [SETUP], <2PresU> X X [SETUP], <3ReadRt> (change status) X X [SETUP], <4Stab> (change setting) X X [SPECIAL], <1AutoZ> X [SPECIAL], <1AutoZ>, <1on/OFF> X X [SPECIAL], <1AutoZ>, <3edit> X X [SPECIAL], <2SDS> X X [SPECIAL], <3Atm> X [SPECIAL], <4Remote> (access) X [SPECIAL], <4Remote> (make changes) X X [SPECIAL], <5Reset> X X [SPECIAL], <5Reset>, <3com> X X X [SPECIAL], <5Reset>, <4cal> X X X [SPECIAL], <5Reset>, <5all> X X X [SPECIAL], <6Cal> X X [SPECIAL], <6Cal>, <1RPT>, <2edit> X X X [SPECIAL], <6Cal>, <1RPT>, <3run ZNATERR> X X X [SPECIAL], <6Cal>, <2barometer>, <2edit> X X X [SPECIAL], <7Intern> X [SPECIAL], <7Intern>, <3Time> (make changes) X X X [SPECIAL], <7Intern>, <4ID>, <2edit> X X X [SPECIAL], <9Log> (view) X [SPECIAL], <9Log> (clear log) X X X

Remote communications disabled

 OPERATION

RPM3 is delivered with NO active password so access to the User Level menu is open. The user level is set to <1Low>. User levels can be changed freely until a password has been created.

To access the User Level function, press [SPECIAL] and select <8Level>. If NO password yet exists or if the correct password has been entered. The display is:

Selecting <1change> user level brings up the restriction menu:

You can then select the current restriction level, or [ESCAPE] back to the main run screen.

Selecting <2edit password> displays the user password and allows it to be edited. Passwords can be up to six numbers in length and cannot start with a zero.

1change user level

edit password

Restriction: 1none

low 3medium 4high

Password: pppppp

disables passwor

RPM3™ OPERATION AND MAINTENANCE MANUAL

Once a password has been entered, the user level cannot be changed without reentering

the password.

If 0 (zero) is entered, then the password is made inactive and a password will NOT be required to access the user level menu. This is the factory default with a security level of <2low>.

If there is an active password, the RPM3 password entry screen appears. The user must enter the user defined password or the factory secondary password to proceed any further:

RPM3 SNnnnn-xx

assword: ppppp

The first field <nnnn> is the serial number of the RPM3, followed by a second field <xx> that represents the number of times that a secondary password has been used. This second field increments each time a secondary password is used. The third field, <pppppp>, is for normal password entry.

The factory secondary password is available in case the user’s password has been

misplaced or forgotten. It can be obtained by contacting a DHI Authorized Service Center. The factory secondary password is different for all RPM3’s and changes each time it is used.

3.4.9 LOG

 PURPOSE

To view and/or clear the RPM3 event log.

 PRINCIPLE

RPM3 records to a log each time one of the following events occurs:

• Pmax! is exceeded (see Section 3.2.4.1)

• A memory fault occurs

 OPERATION

To view the event log press [SPECIAL] and select <9Log>. The oldest logged event appears. Pressing [ENTER] steps through the logged events from the oldest to the most recent and ending with the option to clear the log. Select <YES> or <NO>.

If NO events have been logged, <End of log> displays.

4. REMOTE OPERATION

44..

EEMMOOTTEE

PPEERRAATTIIOON

4.1 OVERVIEW

Most of the RPM3 front panel functions can also be executed by commands from a remote computer. The host computer can communicate to the RPM3 using the RPM3 COM1 RS-232 port or the IEEE-488 port.

4.2 INTERFACING

Sending a message to the RPM3 places it in remote mode. The remote indicator to the bottom right of the display lights when the RPM3 is in remote mode. It will also flicker when a message is received. The menus usually accessed from the front panel are locked out while in remote. [ESCAPE] returns the RPM3 to local operation unless the SYSTEM:KLOCL ON command was used to lock out keypad operation.

4.2.1 RS-232 INTERFACE

4.2.1.1 COM1

The RPM3 COM1 RS-232 interface is located on the rear panel. It is a 9-pin female DB-9F connector configured as a DCE device. Data is transmitted out of RPM3 using pin 2 and is received on pin 3. This allows a normal pin-to-pin DB-9M to DB-9F RS-232 cable to be used to connect to a DTE host. Handshaking is NOT required or supported.

Table 14 RPM3 COM1 DB-9F Pin Designations

PIN # FUNCTION DESCRIPTION

2 TxD This pin transmits serial data from the RPM3 to the host.

3 RxD This pin accepts serial data from the host computer.

5 Grn This pin is the common return for the TxD and RxD signals.

Table 15 IBM PC/XT DB-9F, DB-9M Connections

IBM PC/XT DB-9F

CONNECTIONS

DB-25M DB-9F DB-9M DB-9F

2 3 3 3

3 2 2 2

7 5 5 5

IBM PC/XT DB-9M TO RPM3 DB9F

CONNECTION

RPM3™ OPERATION AND MAINTENANCE MANUAL

4.2.1.2 COM2

The RPM3 COM2 RS-232 interface is located on the rear panel. It is a 9-pin male DB-9M connector configured as a DTE device. Data is transmitted out of the RPM3 using pin 3 and is received on pin 2. This allows a normal pin-to-pin DB-9F to DB-9M RS-232 cable to be used to connect to a DCE slave. Handshaking is NOT required or supported. COM2 can be used to allow communication to other RPM3’s by connecting the Host port to the first RPM3’s COM1 port, and then connecting COM1 of the second RPM3 to the COM2 port of the first RPM3. This method can be used to chain multiple RPM3s together using the SYS:COMM:THRU command.

Table 16 RPM3 COM2 DB-9M Pin Designations

PIN # FUNCTION DESCRIPTION

2 RxD This pin accepts serial data from another RPM3 or another

3 TxD This pin transmits serial data from the RPM3 to another

5 Grn This pin is the common return for the TxD and RxD signals.

device.

RPM3 or another device.

4.2.2 IEEE-488 (GPIB)

The RPM3 IEEE-488 interface is located on the rear panel. The physical and electrical interface conforms to IEEE Std 488.1-1987 Subset E2 and IEEE Std. 488.2-1992. Do NOT attempt to communicate with the IEEE-488 interface while using the COM1 interface. The IEEE-488 receive buffer is 250 bytes deep. The RPM3 will hold off release of the NRFD handshake line until it can service and empty the receive buffer. This keeps the buffer from overflowing.

4.3 REMOTE COMMAND SYNTAX AND STYLE

4.3.1 LOCAL AND REMOTE SETTING

When in local mode, each of the three ranges of each of the (up to) two RPTs has its own settings (unit, mode, resolution, stability) (see Section 3.1.2.5) that are set range specifically and remain with the range. When ranges are changed, the settings change to those that were last set in that range. Settings change as ranges are changed. In remote, each RPT is treated as a channel and the settings are common to all the ranges of one RPT. The only range specific settings are calibration and AutoZ settings. When you change ranges on one RPT the settings remain the same. Changes made to the settings while in remote mode will remain when operation is switched back to local mode.

4.3.2 COMMAND SYNTAX

The remote command set for the RPM3 uses SCPI, 1992.0 (Standard Communications Protocol for Instruments) syntax and format. Commands are grouped into subsystems that contain related keywords in a hierarchical structure in a command tree. These keywords are strung together to create a command. A colon (:) is a header separator that separates each keyword as you move down each level or node of the command tree. The beginning of a command message does NOT require a colon (:), but one is allowed.

4. REMOTE OPERATION

Each keyword has a long form and a short form. The short form is always shown in uppercase, while the remaining lower case letters indicate the long form. Either long or short form use is allowed and the RPM3 is case insensitive to these commands. Brackets ([ ]) are used to identify optional keywords that are the default keyword for a particular node.

4.3.3 QUERIES AND REPLIES

Many commands require additional parameters, some require NO additional parameters, and many also have a query form. Some commands are only queries. A question mark (?) immediately following a command specifies a query. Commands for the COM1 port and the IEEE-488 port use the same style and syntax, but differ slightly in their responses from RPM3. When using the IEEE-488 port, only queries generate a reply from the RPM3. When using the COM1 port, every command generates a reply, and the user must wait for the reply before sending another command. For COM1 non-query commands, the RPM3 replies with an <OK> or <ERROR>. This maintains sync between the host and the RPM3.

4.3.4 MULTIPLE COMMANDS

Multiple commands may be sent within a single message to the RPM3 if desired. These commands must be separated by a semicolon (;) and the total message length cannot exceed 80 characters. Each command must be preceded by a colon (:) (unless you wish to reference the previous command node (discussed later)). Query replies to such messages are returned in a single reply message with each reply separated by a semicolon (;). If you send multiple commands in a single message to the COM1 port, each query generates a reply and each non-query command generates an <OK> response, with a semicolon (;) separating each reply within the reply message.

Example:

RPM3

When using multiple commands, you may reference the previous command level by NOT preceding the command with a colon (:). RPM3 interprets the command starting at the command level defined by the preceding command in the message. This level must be established by the first command of a message.

Example:

To set the RPM3 COM1 port to 2400 baud, even parity, 7 bit word length and one stop bit, you could send:

Because this message actually contains four commands, the reply from the RPM3 if using the RPM3 COM1 port would be:

RPM3 (GPIB): “SYST:VER?;:DISP:BLAN 10;:ABOR”

PC (GPIB): “1992.2”

RPM3 (COM1): “SYST:VER?;:DISP:BLAN 10;:ABOR”

PC (COM1): “1992.2;OK;OK”

“COMM:SERIAL:TRAN:BAUD 2400;PAR EVEN;BITS 7;STOP 1”

“OK;OK;OK;OK”

4.3.5 COMMAND PARAMETERS

Command parameters can be required or optional. There must be at least one space preceding the first parameter. Additional parameters are preceded by a comma (,). Parameters which depend on a unit (e.g., pressure or height) are interpreted in the current default unit unless a unit suffix follows the parameter separated by at least a space. Where indicated, specific keywords can be used in place of parameters for MIN, MAX and DEFAULT parameter values that are determined by the RPM3. Brackets ([ ]) are used to identify optional parameters. In some cases, queries may allow parameters.

RPM3™ OPERATION AND MAINTENANCE MANUAL

4.3.6 SUFFIXES

In some cases, a numeric suffix can follow a keyword to differentiate between the Hi RPT and the Lo RPT. 1 accesses the Hi RPT, and is the assumed RPT if a suffix is NOT given. 2 accesses the Lo RPT (if present). The command descriptions indicate an optional suffix by the use of [n] where n can be 1 or 2.

4.3.7 PROGRAMMING TIPS

4.3.7.1 SCPI AND IEEE-488.2

The RPM3 uses a remote command syntax and format based on the SCPI (Standard Commands for Programmable Instruments) language (see Section 4.3). SCPI has been adopted because it provides the benefits of a standardized logical structure and common command syntax for users of programmable test instruments. Those that have developed programs for other SCPI compliant instruments will find the RPM3 command set familiar and easy to understand. First time SCPI users need to take some time to become familiar with the hierarchical SCPI commands. At first, these will seem complex, especially when compared with the simple linear command set used with older DHI products. In fact, they offer greater versatility and commonality with other programmable test instruments.

RPM3 also supports IEEE-488.2 common and status commands.

LabVIEW® drivers are available for the RPM3. These drivers allow users of

the National Instruments’ LabVIEW environment to create systems that include one or more RPM3s using LabVIEW virtual instruments instead of using the remote commands directly. The RPM3 LabVIEW drivers are an abstraction of the remote commands into a consistent set of common and specific instrument functions. The drivers can be obtained at NO charge from the DHI web site www.dhinstruments.com.

4.3.7.2 PROGRAM TECHNIQUE

The following seven step procedure can be used to create a program which acquires pressure data over the RPM3’s remote interface.

Establish communications with the RPM3 via RS-232 or IEEE488.

RS-232 (COM1): To establish serial communications, the PC and RPM3 must be

configured to have matching baud rates, parity, data bits, and stop bits. The PC’s COM port must be connected to the RPM3’s COM1 port using a straightthrough DB9M-to-DB9F cable (see Section 4.2.1). The RPM3 COM1 port can be configured locally from the front panel by pressing [SPECIAL] and selecting <4Remote> (see Section 3.4.4).

RPM3 supports an independent RS-232 self test to verify that the RPM3

RS-232 ports are operating correctly and the interface cable being used is valid. Use this self test to trouble sheet if you are having difficulty establishing communications over RPM3 COM1 (see Section 3.4.4).

4. REMOTE OPERATION

IEEE-488: To establish IEEE-488 communications, the PC must have an IEEE-

488 card and the RPM3 must be correctly addressed (see Section 4.2.2). The RPM3’s IEEE-488 address can be set locally from the front panel by pressing [SPECIAL] and selecting <4Remote> (see Section 3.4.4). An IEEE-488 interface cable must be used.

Send the command “*IDN?” and read the response (see Section 4.4.2.1). Scan the response for the string “RPM3”. This verifies that communications have been successfully established and that the instrument connected is actually an RPM3.

When in high security user level (see Section 3.4.8), remote commands are

locked out. This mode is set from the front panel. Any attempt to communicate remotely when locked out by the user level results in an error. The error query remote command (see Section 4.4.2.8) is the only remote command that will function when remote commands are locked out by the user level.

Set the pressure units for the desired RPT.

Send the command “UNIT[n] P

RESUNIT” (where n equals 1 to select the

Hi RPT and 2 to select the Lo RPT). For example, to set the measurement units on the lo RPT to psi, send the command “UNIT:PRESsure2 PSI”.

Note that the keyword “PRESsure” is optional for this command, so the

command

“UNIT2 PSI” would have the same effect (see Section 4.4.2.9).

Set the pressure measurement mode for the desired RPT.

Send the command “UNIT[n]: Hi RPT and 2 to select the Lo RPT. Where P

PRESMODE” (where n equals 1 to select the

RESMODE equals A to select

absolute and G to select gauge. For example, to set the measurement mode on the Lo RPT to gauge, send the command “UNIT:PRESsure:MODE G” (see Section 4.4.2.9).

Turn SDS OFF (disable SDS) on the RPT that is going to be used to

make measurements.

Send the command “SDS[n] OFF” (where n equals 1 to select the Hi RPT

and 2 to select the Lo RPT). For example, to turn SDS OFF (disable SDS) on the Lo RPT, send the command “SDS2 OFF”. It is generally recommended to turn SDS ON for the RPT channel that is NOT being used to isolate it from the TEST port. For this example, use the command “SDS1 ON”. The SDS command is NOT necessary if SDS is NOT present on the RPT (see Section 1.2.3 to determine if SDS is present).

RPM3™ OPERATION AND MAINTENANCE MANUAL

Incorrect use of SDS may result in RPT overpressure and severe damage to

RPM3.

Before using the SDS command, determine your RPM3’s configuration (see Section 1.2.3) and become thoroughly familiar with SDS principles and operation (see Sections 3.1.2.6, 3.2.8 and 3.4.2).

When SDS is ON for an RPT, that RPT is isolated from the TEST port. Turning SDS OFF for an RPT (disabling SDS), connects that RPT to the TEST port. Before turning SDS OFF, be sure that the pressure applied to the RPT’s TEST port is less than the maximum acceptable pressure for that RPT. Always turn SDS ON to protect an RPT when it is NOT in use.

Some RPTs are NOT equipped with SDS. An SDS command directed to an RPT channel that is NOT equipped with SDS results in an error message (see Section 4.4).

Start and get a new pressure measurement.

Send the command “MEASure[n]? Lo|Mid|Hi” (where n equals 1 to select

the Hi RPT and 2 to select the Lo RPT). This command allows the RPT range and resolution for a pressure measurement to be defined. For example, to read the pressure using Range 2 (the Mid range) of the Lo RPT send the command “MEASure2:PRESsure? MID”. Note that the resolution is an optional parameter and was NOT sent in this example (see Section

4.4.2.2).

Obtain information related to the last measurement cycle.

Use the “FETCh[n]?” command. The “FETCh[n]?” command does NOT initiate a new pressure reading cycle and therefore can be used to quickly obtain previously initiated pressure readings. For example, to read the pressure rate of change that was associated with the measurement cycle of Step

above, send the command “FETCh2:Rate?” (see Section 4.4.2).

Read the pressure ready status associated with the last measurement cycle.

Use the “CALCulate:STABility[n]:LIMIT:FAIL?” This command allows the Ready/NOT Ready status of the previous pressure measurement to be determined (see Section 3.1.2). For example, send the command “CALCulate:STABility2:LIMIT:FAIL?” to read the stability dependent Ready/NOT Ready value associated with the reading made in Step

above

(<0> if ready, <1> if NOT ready) (see Section 4.4.2.3).

The preceding procedure utilizing the “MEASure” command is recommended for single pressure readings. This command is simple to use since it allows the selection of RPT, range and resolution, initiates a pressure measurement cycle and reads the result all in a single command. The drawback of combining all these functions in a single command is that it takes several seconds to execute and includes functions that are NOT necessary when repeating measurements. The preferred method when taking repeated readings from a specific RPT and range is to first use the “CONFigure” command to set the range and resolution and then to repeatedly use the “READ” command to start and get the pressure measurements on the current range. The following commands could be used to perform the same test as described above instead of using the measure command: “CONFigure2 Mid” followed by “READ2?” (see Section 4.4.2.2).

4. REMOTE OPERATION

In fact, if RPM3 is already set up as needed for the measurements to be made, the only command that is needed to collect data is the READ[n]? command. For the test above, the command to send to read pressure from the current range is “READ2?”.

Table 17 Quick Tips

IN ORDER TO USE COMMAND NOTES

Set the pressure units. UNIT[n] PRESUNIT Use UNIT:MODE to set

Read the pressure using the current range of the specified RPT, in current measurement units and resolution.

Turn SDS OFF or ON for the specified RPT.

Set the RPT and range and read the pressure.

Determine the pressure stability rate dependent ready/NOT ready condition for a pressure reading.

Read the pressure rate of change associated with a prior pressure reading.

Set the head height. CALC:HEAD:HEIGht HEIGHT Send UNIT:HEIGht IN|CM

Turn ON AutoZ for the specified RPT.

Run AutoZ on a specified RPT and range to specify the value of ZSTD and determine a new ZOFFSET for a given range and measurement mode.

Check if the upper limit was exceeded.

See if any errors have occurred.

Have the RPM3 screen correspond to a specific RPT and range.

READ[n]?] Remember to turn SDS OFF,

SDS[n] OFF|ON Use with caution (see

CONF[n] Lo|Mid|Hi followed by READ1[n]?

CALC:STAB[n]:LIMIT:FAIL?

FETC[n]:RATE? Fetch can also be used to

CAL[n]:ZERO:STATe ON This enables AutoZ on the

CAL[n]:ZERO:AUTO [ONCE,ZSTD]

SENS[n]:PROT:TRIP? SENS[n]:PROT:CLE is used

SYST:ERR?

CONF[n]: RANGE This command affects the

gauge or absolute measurement mode.

if present, prior to taking a reading.

Section 3.1.2.6).

As an alternate, Meas[n]? Lo|Mid|Hi also works but contains redundant functions when used repeatedly on the same range.

Returns <0> when previous reading was ready (within stability criterion).

reread the last pressure.

prior to setting the head height.

current range. The setting applies to other ranges on the same RPT when the range is changed.

Prior to executing this command the range must be selected using the CONF command and the measurement mode must be selected using the UNIT:MODE command.

to clear this flag.

display. READ and MEAS commands do NOT.

RPM3™ OPERATION AND MAINTENANCE MANUAL

4.4 COMMANDS

Table 18 Command Summary

Items inside brackets [ ] are optional A ‘|’ signifies ‘or’

[n] specifies the RPT channel (‘1’ Hi, ‘2’ Lo. Default is ‘1’)

[nn] specifies the optional RPT range from 1 to 3 (default is ‘1’)

COMMAND PARAMETERS NOTES

*CLS *ESE *ESR? *IDN? *OPC *OPT? *RSE *RSR? *RST *SRE *STB? *TST?

:ABORt

:CALCulate

:HEAD :HEIGht :MEDium :DENSity :STABility[n] :LIMIT :FAIL?

:CALibration[n]

:AMBient [:PRESsure] :DATE :RPT[nn] :DATE :ZERO :STATe :AUTO :OFFSet[nn] :ABSolute :GAUGe :NATerr[nn]

:CONFigure[n ]

[:PRESsure]

:DISPlay BLANking

PAGE RPT?

:FETCh[n ]

:[PRESsure]? :RATE?

:INITiate[n] [:IMMediate] :CONTinuous

:MEASure[n] [:PRESsure]? :RATE?

Command only

0..255 Query only Query only None Query only

0..255 Query only Command only

0..255

0..255 Query only

HeadHeight N2|He|Air|Oil|H20|User Density

Stability Query only

Adder, Multiplier YYYY,MM,DD Adder, Multiplier YYYY,MM,DD

0 |1 |OFF|ON ONCE

Absolute ZOFFSET Gauge ZOFFSET ZNATERR

range, resolution

…...

0..99 min

1..7 Query only

…… Query only Query only

…... Command only 0|1|OFF|ON

…... range, resolution range, resolution

Clears the queues and status registers Event status enable register Event status register Identify software version and hardware Operation complete Operation identification RPT ready status enable register RPT ready status event register Reset to default settings Service request register Status byte System self test results

Halt current measurement cycle

Height difference of RPM3 and DUT The pressure medium The user defined pressure medium density

Stability limit Stability limit Ready status

Barometer PA/PM Barometer calibration date RPT range PA/PM RPT range calibration date

AutoZ on/OFF Run AutoZ

ZOFFSET for absolute mode ZOFFSET for gauge mode ZNATERR (absolute mode only)

Configure RPT for range and resolution.

…... Screen saver period Changes the DISPLAY function Gets all 3 of the RPT range values

…... Press result from a previous measurement Rate result from a previous measurement

…... Starts a new single measurement cycle Disable/Enable continuous measurement

…... Start and get new pressure measurement Start and get new rate measurement

4. REMOTE OPERATION

COMMAND PARAMETERS NOTES

SENSe[n]

[:PRESsure] :PROTection :LEVel :ABSolute :GAUGe :TRIPped? :CLEar :AVERage :COUNt :AUTO

:READ[n]

[:PRESsure]? :RATE? :STATus :OPERation :CONDition? :NTRAnsition :PTRAnsition [:EVENt] :ENABle :INSTrument :CONDition? :NTRAnsition :PTRAnsition [:EVENt] :ENABle

:ISUMmary[n]

:CONDition? :NTRAnsition :PTRAnsition [:EVENt] :ENABle

:QUEStionable :CONDition? :NTRAnsition :PTRAnsition [:EVENt] :ENABle :INSTrument :CONDition? :NTRAnsition :PTRAnsition

[:EVENt] :ENABle

:ISUMmary[n]

:CONDition? :NTRAnsition :PTRAnsition [:EVENt] :ENABle

…...

Upper Limit Upper Limit Query only Command only

0..10 0 |1|OFF|ON

…... Query only Query only

Query Only

0..32767

Query Only

0..32767

Query Only

0..32767

Query Only

0..32767

Query Only

0..32767

Query Only

0..32767

......

The absolute mode upper limit (UL) alarm The gauge mode limit (UL) alarm Check if UL has been exceeded Clears the “TRIPped” flag

The # of measurements to average Disable/enable the auto read rate

…... Start and get new pressure measurement Start and get new rate measurement

Read the condition register Reads or sets the negative transition filter Reads or sets the positive transition filter Reads or sets the event register Reads or sets the event enable

Read the condition register Reads or sets the negative transition filter Reads or sets the positive transition filter

Reads or sets the event register Reads or sets the event enable

Read the condition register Reads or sets the negative transition filter Reads or sets the positive transition filter Reads or sets the event register Reads or sets the event enable

RPM3™ OPERATION AND MAINTENANCE MANUAL

COMMAND PARAMETERS NOTES

:SYSTem

:AMBient [:PRESsure]? :BEEPer :STATe :FREQuency :IMMediate :COMMunicate :DATE

:SERial[x]

:TRANsmit :BAUD :BITS :PARity :STOP :[RECeive] :BAUD :BITS :PARity :STOP

:GPIB :ADDRess :THRU :ERRor? :IDENtify :KEY :KLOCk :POWer

:RANGe[n]? :SDS[n]

:TIME :VERSion?

:UNIT :HEIGht [:PRESsure][n] :MODE :COEFficient? :TEMPerature :USER

…...

Query only

0 |1|OFF|ON

250..10000

YYYY,MM,DD

[x] defines COM1 or COM2

1200|2400|4800|9600|19200 7|8 EVEN|ODD|ZERO|ONE|NONE 1|2

1..30 message Query Only ID number

0..20 0 |1|OFF|ON 0 |1|OFF|ON Query only 0 |1|OFF|ON HH:MM “AM”| “PM” Query only

…...

Gets the most recent barometer meas

Enable/Disable valid key press beep Changes the key press beep frequency Beeps the beeper once

Reads or sets RPM3 calendar

RS-232 baud rate RS-232 word length RS-232 parity type RS-232 number of stop bits

The IEEE-488 address Communicate with device on COM2 Get a message from the error queue Read or sets RPM3 ID number Same as a direct key press Locks/unlocks the front panel. Turn the RPM3 power soft ON or OFF gets the active RPT channel & range SDS ON/OFF system Reads or sets the RPM3 clock

SCPI “version” in the form “YYYY.n”

….....

Default height units Default pressure units The pressure measurement mode Pressure unit conversion coefficient Sets the ref temperature for inWa unit Defines a user unit

4. REMOTE OPERATION

4.4.1 ERROR MESSAGES

While using COM1, the RPM3 always replies to a non-query program message with <OK> if an error did NOT occur or <ERROR> if an error was reported to the RPM3 error queue. If you are using the IEEE-488 port, then only queries reply. So, you must use the status reporting system to generate a service request when the error queue is NOT full, or you must check the error queue periodically using the “SYSTem:ERROr?” query.

Each error is placed into the Error Queue as it occurs. The “SYSTem:ERROr?” query can then be used to remove each error description (first in, first out) from the queue. The query reply <0, No error> signals that the error queue is empty. Table 19 lists the possible error numbers and the error description for each.

Table 19 “SYSTEM:ERROR?” QUERY REPLY

“0, No error” “-100, Command error” “-102, Syntax error” “-103, Invalid separator” “-108, Parameter NOT allowed” “-109, Missing parameter” “-110, Command header error” “-114, Header suffix out of range” “-138, Suffix NOT allowed” “-141, Invalid character data” “-150, String data error” “-222, Data out of range” “-224, Illegal parameter value” “102, User defined coefficient cannot be 0” “103, Not available with an absolute RPT” “104, Not available with a gauge RPT” “105, Not available with altitude units” “106, Not available with absolute units” “107, Not available with gauge units” “110, Numeric data NOT part of set” “111, Numeric data length too great” “112, Remote communications is restricted (see Section 3.4.8) “120, Data length too great” “130, String data NOT part of set” “131, String data length too great” “140, Pressure exceeds range upper limit” (see Section 3.2.4) “150, External device NOT detected” “151, External device improperly configured” “152, External device timeout error” “160, SDS NOT available” “161, RPT timeout” “180, Ambient temperature sensor failed “181, Ambient pressure sensor failed

RPM3™ OPERATION AND MAINTENANCE MANUAL

4.4.2 COMMAND DESCRIPTIONS

Each command description gives the full syntax showing the short form in uppercase, and the long form remainder in lower case. If the command has only a query form, it is followed by a question mark (?), and only a query syntax is given. If the command is NOT just a

query, the command form is also given. Parameters are indicated by italics. Ranges of

parameters or parameter types are indicated. The ‘|’ character indicates multiple possible literal parameters or responses.

4.4.2.1 IEEE STD. 488.2 COMMON AND STATUS COMMANDS

The RPM3 supports a set of commands that are common to all instruments conforming to IEEE Std. 488.2 protocol. Though defined by the IEEE-488.2 standard, they also apply to RPM3 RS-232 (COM1) communications. These command make it easy to perform basic functions for any device that supports these commands. These commands also cover the status reporting commands. Refer to Section 4.5 for details on the status registers mentioned in these commands. These IEEE-488.2 common commands always start with an asterisk (*).

∗IDN

Purpose Identify the RPM3 version, range, and serial number. Query Notes The identification reply is made up of the manufacturer, the model, the serial number

Query Reply “DH INSTRUMENTS INC, RPM3 A0100/A0015, 1234, Ver1.00 -dhf”

“∗IDN?”

and the software version. Each is separated by a comma.

∗OPC

Purpose Sets the operation complete bit when all operations have completed. Command Query Notes This command enables the RPM3 to set the OPC bit in the standard event status

Query Reply “0” or “1”

“∗OPC” “∗OPC?”

register when it has completed all pending functions. The query replies with a “1” when all functions are complete. Since the RPM3 does NOT support overlapping commands, this command has NO practical use.

∗OPT

Purpose Reads the list of installed RPM3 options. Query Notes This query returns any registered electronic option(s) installed in the RPM3. Each

Query Reply “NONE”

“∗OPT?”

option is separated by a comma.

∗RST

Purpose Resets the RPM3 settings to factory settings. Command Notes This command sets the RPM3 settings to factory settings which is equivalent to a

See Also Sections 3.4.4, 4.2.

SYSTEM:COMMUNICATE:SERIAL[M][:RECEIVE]:BITS SYSTEM:COMMUNICATE:SERIAL[M][:TRANSMIT]:BITS

Purpose Sets or gets the RS-232 port data word length. Command “SYST:COMM:SER[m]:BITS NUMBERBITS”

Query “SYST:COMM:SER[m]:BITS?” Section m: ‘1’ to set the COM1 word length (default). Parameters NUMBERBITS: “7”|“8”

Query Reply NUMBERBITS Notes The receive and transmit word lengths are always the same, so both commands

See Also Sections 3.4.4, 4.2.

SYSTEM:COMMUNICATE:SERIAL[M][:RECEIVE]:PARITY SYSTEM:COMMUNICATE:SERIAL[M][:TRANSMIT]:PARITY

Purpose Sets or gets the parity for the RS-232 port. Command “SYST:COMM:SER[m]:PAR PARITY”

Query “SYST:COMM:SER[m]:PAR?” Section m: ‘1’ to set the COM1 parity (default). Parameters PARITY: “EVEN”|“ODD”|“NONE”|“ONE”|“ZERO”.

Query Reply PARITY Notes The receive and transmit parity are always the same, so both commands change

See Also Sections 3.4.4, 4.2.

disable error feedback or alarm events.

’1’ or ON to enable the beeper events.

is NOT supported.

“SYST:COMM:SER[m]:TRAN:BAUD B “SYST:COMM:SER[m]:TRAN:BAUD?”

‘2’ to set the COM2 baud rate.

change the transmit baud rate as well as the receive baud rate.

“SYST:COMM:SER[m]:TRAN:BITS N “SYST:COMM:SER[m]:TRAN:BITS?”

‘2’ to set the COM2 word length.

change the transmit word length as well as the receive word length.

“SYST:COMM:SER[m]:TRAN:PAR P “SYST:COMM:SER[m]:TRAN:PAR?”

‘2’ to set the COM2 parity.

the transmit parity as well as the receive parity.

AUDRATE”

UMBERBITS”

ARITY”

RPM3™ OPERATION AND MAINTENANCE MANUAL

SYSTEM:COMMUNICATE:SERIAL[M][:RECEIVE]:STOP SYSTEM:COMMUNICATE:SERIAL[M][:TRANSMIT]:STOP

Purpose Sets or gets the number of stop bits for the RS-232 port. Command “SYST:COMM:SER[m]:STOP STOPBIT”

Query “SYST:COMM:SER[m]:STOP?” Section m: ‘1’ to set the COM1 stop bits (default). Parameters STOPBITS: 1|2

Query Reply BSTOPBITS Notes The receive and transmit stop bits are always the same, so both commands

See Also Sections 3.4.4, 4.2.

SYSTem:COMMunicate:THRU

Purpose Transfers massages to and from the specified COM2 port. Command Query Parameters MESSAGE: The message to send to the port. It can be up to 60 char long.

Query Reply REPLY Any message that is received by the port within 2 seconds. Notes You can communicate with other instruments via the COM2 of the RPM3.

SYSTEM:DATE

Purpose Reads or sets the RPM3 calendar. Command “SYST:DATE YEAR, MONTH, DAY” Query “SYST:DATE? ” Parameters YEAR:

Query Reply YEAR, MONTH, DAY Notes The internal calendar is active even when the unit is NOT connected to a power

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