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DH Instruments RPM3 - VERSION 2002 Operation And Maintenance Manual

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

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Summary of Contents for DH Instruments RPM3 - VERSION 2002

  • Page 1 RPM3™ Reference Pressure Monitor Operation and Maintenance Manual © 1998-2002 DH Instruments, Inc.
  • Page 2 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. ©...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS T A B L E O F C O N T E N T S ............. . . I T A B L E S .
  • Page 4 RPM3™ OPERATION AND MAINTENANCE MANUAL 3.1.2.7 DIRECT FUNCTION KEYS SUMMARY....................21 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...
  • Page 5 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...

  • Page 6: Tables

    RPM3™ OPERATION AND MAINTENANCE MANUAL 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 (>...
  • Page 7 FIGURES & TABLES Figure 1 Rear Panel (Left) One or Two Group 1 RPTs (Right) One or Two Group 1 RPTs with a GXXXX RPT ........................... 6 Figure 2 Schematic (Left) Two Group 1 RPTs (Right) One Group 1 RPT ..........6 Figure 3 Rear Panel (Left) One Group 1 RPT and One Group 2 RPT (Right) One Group 1 GXXXX RPT and One Group 2 RPT..................

  • Page 8: A B O U T T H I S M A N U Al

    RPM3™ OPERATION AND MAINTENANCE MANUAL 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.

  • Page 9: 1. Introduction

    1. INTRODUCTION 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.

  • Page 10: Pressure Measurement Specifications

    RPM3™ OPERATION AND MAINTENANCE MANUAL Pressure Connections Test port (RPT ≤ 10 000 psi): 1/8 in. NPT F Test port (RPT > 10 000 psi): DH500 (gland and collar type for coned and left hand threaded tube, equivalent to AE F250C, HIP HF4, etc.) Test (-): 1/8 in.

  • Page 11: Standard Reference Pressure Transducer (Rpt)

    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 Oscillating quartz resonator Warm Up Time ≤ 1 500 psi 15 minutes Resolution To 1 ppm, user settable by individual range Overpressure Limits Without effect on calibration 115 % of Range 3...

  • Page 12: B Type Reference Pressure Transducer (Rpt)

    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 Micro-machined piezoresistive silicon Warm Up Time None required Resolution 10 ppm, user settable by individual range Overpressure Limits...

  • Page 13: Configurations

    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 TEST RPT GROUP...

  • Page 14: One Or Two Rpts: Group 1 (< A1500)

    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 HI RPT LO RPT TEST TEST (-) PORT OF TEST TEST PORT PORT FITTING FITTING PROTECTION PORTS...

  • Page 15: Liquid Filled Group 1

    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 HI RPT LO RPT TEST...

  • Page 16: Two Rpts: Both Group 2 (> A1500 And < A10000) Or Liquid Filled Group 1

    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 HI RPT LO RPT TEST OF TEST...

  • Page 17: One Rpt: Group 2 (> A1500 And > A10000) Or Group 3 (> A10000) Or Liquid Filled Group 1

    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 HI RPT OF TEST...
  • Page 18 RPM3™ OPERATION AND MAINTENANCE MANUAL © 1998-2002 DH Instruments, Inc. Page 10...

  • Page 19: I N S T A L L A T I O

    2. INSTALLATION 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.

  • Page 20: Initial Setup

    RPM3™ OPERATION AND MAINTENANCE MANUAL 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).

  • Page 21: Rear Panel

    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 3. IEEE-488 (GPIB) Connector Configuration (see Section 1.2.3) 4.

  • Page 22: The Atm And Vent Ports

    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).

  • Page 23: Power Up And Verification

    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). 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).

  • Page 24: Checking Gauge Mode Pressure Measurement

    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).

  • Page 25: O P E R A T I O

    3. OPERATION 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...

  • Page 26: General Operating Principles

    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. 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.

  • Page 27: Soft [On/Off] Key

    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.

  • Page 28: Sds Self Defense System

    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.

  • Page 29: Direct Function Keys Summary

    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.

  • Page 30: Direct Function Keys

    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 (main, ambient, system).
  • Page 31 3. OPERATION When [RANGE] is first pressed, the active reference pressure transducer (RPT) and range are displayed, for example: Identifies active RPT (LO or HI). Identifies active range (1, 2 or 3) of the active RPT. Range designator. Current LO,Rng3 Full scale pressure value in the current units for the RPT and range when used in gauge (g) or absolute (a) mode.

  • Page 32: Unit]

    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.

  • Page 33: Mode]

    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).

  • Page 34: Ul] (Upper Limit)

    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.

  • Page 35: Over-Pressure Function (Pmax!)

    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.

  • Page 36: Res] (Resolution)

    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.

  • Page 37: Display]

    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...

  • Page 38: Avg (Average)

    RPM3™ OPERATION AND MAINTENANCE MANUAL OPERATION To set the DISPLAY function press [DISPLAY] from the main run screen. 1Avg 2Rate 3Dev 4RPT The display is: 5Hi/Lo 6Freez 7Clean The cursor is on the active DISPLAY function. Selecting a display function returns to the main run screen with the selected function active.

  • Page 39: Rate

    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: Instantaneous pressure values at RPM3s normal integration rate. * 96.929 kPa a Countdown in seconds until completion of on-going averaging period.

  • Page 40: Dev (Deviation)

    RPM3™ OPERATION AND MAINTENANCE MANUAL With the RATE DISPLAY active the main run screen is: * 99.1135 psi a zH3 R 0.0001/sec Current rate of change of pressure in current pressure units per second. 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 ↑...
  • Page 41 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).

  • Page 42: Hi/Lo

    RPM3™ OPERATION AND MAINTENANCE MANUAL With the RPT DISPLAY active the main run screen is: Active RPT display. * 99.1135 psi a Inactive RPT display. * 2350.23 psi g 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.

  • Page 43: Freeze

    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 To activate the FREEZE DISPLAY. See Section 3.2.6. OPERATION To activate the FREEZE DISPLAY press [DISPLAY] and select <6Free>. Selecting <6Free>...

  • Page 44: Head]

    RPM3™ OPERATION AND MAINTENANCE MANUAL With the CLEAN DISPLAY active the main run screen is: Conventional main run screen first line. * 99.1135 psi a “Clean” second line. To go to a DISPLAY other than CLEAN, press [DISPLAY] and make a new DISPLAY choice (see Section 3.2.6).

  • Page 45: Sds] (Self Defense System)

    3. OPERATION OPERATION To access the HEAD function, press [HEAD]. The display is: Edit head height: 95 cm Test fluid currently specified for the head correction. Entry field for head height (1 to 999 cm or in). 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.
  • Page 46 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.
  • Page 47 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.

  • Page 48: Autoz]

    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 ±...

  • Page 49: Running Autoz In Absolute Measurement Mode

    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).
  • Page 50 RPM3™ OPERATION AND MAINTENANCE MANUAL To run AutoZ in absolute measurement mode, press [AutoZ] from the main run screen. The display is: Active range. AutoZ H3 abs by: Current measurement mode (gauge or abs for absolute). 1Entry 2COM2 3RngL3 Selection of source of ZSTD for ZOFFSET |__________________ _________________| determination.
  • Page 51 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: Pressure reading, units and mode of the active RPT range. 14.104 psi a Active range indicator. ZSTD: 0.0000 Entry field for the value of ZSTD.
  • Page 52 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).

  • Page 53: Setup] Menu Key

    3. OPERATION [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>...

  • Page 54: Presu

    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).

  • Page 55: Readrt (Read Rate)

    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.

  • Page 56: Stab (Stability)

    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 ↑...
  • Page 57 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.

  • Page 58: Special] Menu Key

    RPM3™ OPERATION AND MAINTENANCE MANUAL Once the leak check countdown has completed, the results screen is displayed: Net change in pressure over the leak check time period. ΔP 0.0035 psi Indicator of range in which leak check was run. Rate –0.0002 /sec Average rate of change of pressure over the leak check time period.

  • Page 59: Autoz

    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.
  • Page 60 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).

  • Page 61: Autoz On/Off

    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. 1off 2view To access the RPM3 AutoZ function press [SPECIAL] and select <1AutoZ>.

  • Page 62: View Autoz

    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: Current measurement mode. ZOFFSET absolute Active range. 0.0 Pa Display field of current value of ZOFFSET. ZOFFSET should be zero in absolute mode when the RPM3 is new or has just been calibrated.
  • Page 63 3. OPERATION 3.4.2 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.

  • Page 64: Remote

    RPM3™ OPERATION AND MAINTENANCE MANUAL 3.4.3 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).

  • Page 65: Reset

    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.

  • Page 66: Reset - Sets

    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) •...

  • Page 67: Reset - Cal

    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) •...

  • Page 68: Scrsav

    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.
  • Page 69 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 PURPOSE To view the RPM3 serial number (SN) and to view or edit the ID number.

  • Page 70: Level

    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.

  • Page 71: Table 13. Functions - Security Levels

    3. OPERATION Table 13. Functions - Security Levels FUNCTION MEDIUM HIGH [RANGE] [UNIT] [MODE] [UPPER LIMIT] (change setting) [RES] [RES] (change setting) [DISPLAY] [HEAD] [SDS] [AutoZ] (in absolute mode) [SETUP], <1Head> [SETUP], <2PresU> [SETUP], <3ReadRt> (change status) [SETUP], <4Stab> (change setting) [SPECIAL], <1AutoZ>...
  • Page 72 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 RPM3 SNnnnn-xx...

  • Page 73: Overview

    4. REMOTE OPERATION 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. INTERFACING Sending a message to the RPM3 places it in remote mode.

  • Page 74: Com2

    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.

  • Page 75: Queries And Replies

    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.

  • Page 76: Suffixes

    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).
  • Page 77 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>...
  • Page 78 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 operation (see Sections 3.1.2.6, 3.2.8...

  • Page 79: Table 17 Quick Tips

    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?”.

  • Page 80: Table 18 Command Summary

    RPM3™ OPERATION AND MAINTENANCE MANUAL 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...
  • Page 81 4. REMOTE OPERATION COMMAND PARAMETERS NOTES S E N S e [ n ] …..[ : P R E S s u r e ] : P R O T e c t i o n : L E V e l : A B S o l u t e Upper Limit The absolute mode upper limit (UL) alarm...
  • Page 82 RPM3™ OPERATION AND MAINTENANCE MANUAL COMMAND PARAMETERS NOTES …... : S Y S T e m …... : A M B i e n t Query only Gets the most recent barometer meas [ : P R E S s u r e ] ? : B E E P e r : S T A T e 0 |1|OFF|ON...

  • Page 83: Table 19 "System:error?" Query Reply

    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?”...

  • Page 84: Command Descriptions

    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.
  • Page 85 4. REMOTE OPERATION ∗SRE Purpose Read or set the service request enable register. Command “∗SRE n” Query “∗SRE?” Parameters ’0 to 255’ This is the decimal representation of the bit(s) to enable. To allow the MAV and ESB bits to assert the SRQ line, the argument would be 32+16 = 48.

  • Page 86: Measurement Subsystem

    RPM3™ OPERATION AND MAINTENANCE MANUAL 4.4.2.2 MEASUREMENT SUBSYSTEM The measurement subsystem provides several ways of getting a measurement from the Hi or Lo (if present) RPT. The easiest is to use the MEASure commands. These commands provide a single step configuration and measurement of pressure or rate.
  • Page 87 4. REMOTE OPERATION ABORT[N] Purpose Stops any current remote measurement cycle. Command “ABOR[n]” Suffix ‘1’ to access the Hi RPT (default). ‘2’ to access the optional Lo RPT. Notes Any measurements in progress are stopped. This should be done before INITiating a new measurement to ensure that you are getting a new measurement , and NOT one from a previous cycle.
  • Page 88 RPM3™ OPERATION AND MAINTENANCE MANUAL INITiate[n]:CONTinuous Purpose Starts a new measurement cycle on the specified RPT. Command “INIT[n]:CONT” B OOLEAN Query “INIT[n]:CONT?” Suffix ‘1’ to access the Hi RPT (default). ‘2’ to access the optional Lo RPT. Parameters ‘0’ or OFF to disable OOLEAN ‘1’...

  • Page 89: Calculate Subsystem

    4. REMOTE OPERATION READ[n]:[PRESsure]? Purpose Initiates, and fetches a new RPT pressure measurement. Query “READ[n]?” Suffix ‘1’ to access the Hi RPT (default). ‘2’ to access the optional Lo RPT. Query Reply In the default pressure units and mode. RESSURE Notes The reply can take up to one measurement cycle (1.3 sec), depending on the current integration rate.

  • Page 90: Calibration Subsystem

    RPM3™ OPERATION AND MAINTENANCE MANUAL CALCulate:HEAD:DENSity Purpose Reads or sets the density of the “User” defined medium. Command “CALC:HEAD:DENS D ” ENSITY Query “CALC:HEAD:DENS?” Parameters The density of the medium in kg/m ENSITY Query Reply EDIUM Notes This setting is only used when the “CALCulate:HEAD:” has been set to “User”. See Also Sections 3.3.1, 3.2.7.
  • Page 91 4. REMOTE OPERATION CALibration[n]:ZERO:AUTO Purpose Runs AutoZ to update the value of ZOFFSET for the selected RPT in the currently active range and measurement mode. Command “CAL[n]:ZERO:AUTO ONCE [,ZS ] ” Suffix ‘1’ to access the Hi RPT (default). ‘2’ to access the optional Lo RPT. Parameters “ONCE”...

  • Page 92: Display Subsystem

    RPM3™ OPERATION AND MAINTENANCE MANUAL 4.4.2.5 DISPLAY SUBSYSTEM The display subsystem controls the front panel display attributes including screen saver, time function and ID function. DISPlay:BLANKing Purpose Sets or reads the period of local inactivity RPM3 waits until it dims the screen to 33 % intensity.
  • Page 93 4. REMOTE OPERATION SENSe[n]:AVERage:COUNT Purpose Sets or reads the number of samples averaged by the RPT before completing a measurement cycle. Command “SENS[n]:AVER:COUN S ” AMPLES Query “SENS[n]:AVER:COUN?” Suffix ‘1’ to access the Hi RPT (default). ‘2’ to access the optional Lo RPT. Parameters The number of samples averaged before a measurement cycle is AMPLES...

  • Page 94: Status Subsystem

    RPM3™ OPERATION AND MAINTENANCE MANUAL 4.4.2.7 STATUS SUBSYSTEM For information on the status system, status reporting system and status subsystem see Section 4.5. Familiarize yourself with the status system section before attempting to use status subsystem register commands. STATus:OPERation:CONDition? Purpose Reads the operation condition register.
  • Page 95 4. REMOTE OPERATION STATus:OPERation:INSTrument:NTRansition STATus:OPERation:INSTrument:PTRansition Purpose Reads or sets the instrument negative or positive transition filter. Command “STAT:OPER:INST:NTRansition R ” EGISTER “STAT:OPER:INST:PTRansition R :” EGISTER Query “STAT:OPER:INST:NTRansition?” “STAT:OPER:INST:PTRansition?” Query Reply The 16 bit instrument transition filter. EGISTER Notes If a bit is set in the negative and/or positive transition filter, then a TRUE to FALSE and/or FALSE to TRUE transition of the associated bit in the instrument condition register will cause the associated bit in the instrument event register to be set.
  • Page 96 RPM3™ OPERATION AND MAINTENANCE MANUAL STATus:OPERation:INSTrument:ISUMmary[N][:EVENT]? Purpose Reads and then clears the instrument summary event register. Suffix ’1’ to access the high RPT instrument summary event register. ’2’ to access the optional low RPT event register. Query “STAT:OPER:INST:ISUM[n]?” Query Reply The 16 bit instrument summary event register.
  • Page 97 4. REMOTE OPERATION Notes This register reports the contents of the instrument condition register without altering it’s contents. Events represented by the bits in this register are always enabled and are a direct representation of the event status. Bit0 represents the summary of the ISUMmary1 register which is the questionable status of the high RPT.

  • Page 98: System Subsystem

    RPM3™ OPERATION AND MAINTENANCE MANUAL STATus:QUEStionable:INSTrument:ISUMmary[n]:NTRansition STATus:QUEStionable:INSTrument:ISUMmary[n]:PTRansition Purpose Reads or sets the instrument summary negative or positive transition filter. Command “STAT:QUES:INST:ISUM[n]:NTRansition R ” EGISTER “STAT:QUES:INST:ISUM[n]:PTRansition R :” EGISTER Suffix ’1’ to access the high RPT instrument summary transition filter. ’2’ to access the optional low RPT transition filter. Query “STAT:QUES:INST:ISUM[n]:NTRansition?”...
  • Page 99 4. REMOTE OPERATION SYSTEM:BEEPER:STATE Purpose Enables and disables the beeper for valid keypress feedback. It does NOT disable error feedback or alarm events. Command “SYST:BEEP:STAT B ” OOLEAN Query “SYST:BEEP:STAT? ” Parameters ’0’ or OFF to disable the beeper events. OOLEAN ’1’...
  • Page 100 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 S ” “SYST:COMM:SER[m]:TRAN:STOP S ” Query “SYST:COMM:SER[m]:STOP?” “SYST:COMM:SER[m]:TRAN:STOP?” Section ‘1’ to set the COM1 stop bits (default). ‘2’ to set the COM2 stop bits. Parameters Query Reply Notes...
  • Page 101 4. REMOTE OPERATION SYSTem:IDENtify Purpose Gets or sets the RPM3 identification string. Command “SYST:IDEN I ” Query “SYST:IDEN?” Parameters ‘An alphanumeric string of (up to) 12 characters that the user can use to identify the RPM3. This string is stored in permanent memory and cannot be erased by normal user operation.

  • Page 102: Unit Subsystem

    RPM3™ OPERATION AND MAINTENANCE MANUAL Purpose Turns the SDS system for the specified RPT ON or OFF. Command “SYST:SDS[n] B ” OOLEAN Query “SYST:SDS[n]?” Suffix ‘1’ to access the Hi RPT (default). ‘2’ to access the optional Lo RPT. Parameters ‘0’...
  • Page 103 4. REMOTE OPERATION UNIT[N][:PRESSURE] Purpose Changes the default pressure unit for the specific RPT. Command “UNIT[n] P ” Query “UNIT[n]?” Suffix ‘1’ to access the Hi RPT (default). ‘2’ to access the optional Lo RPT. Parameters “psi” “psf” “inHg” “inWa” “kcm2”...

  • Page 104: Status System

    RPM3™ OPERATION AND MAINTENANCE MANUAL UNIT[:PRESsure]:USER Purpose Get or set the user definable pressure unit. Command “UNIT:USER C ” Query “UNIT:USER?” Parameters Coefficient to multiply pressure in Pascal to get pressure in the current default pressure units. ‘The text label to assign to the user unit (1 to 4 characters. NO ABEL white spaces).

  • Page 105: Table 20 8 Bit Status Byte Register

    4. REMOTE OPERATION 4.5.1.3 STATUS BYTE REGISTER The RPM3 contains an 8 bit status byte register that reflects the general status of the RPM3: Table 20 8 Bit Status Byte Register OPER RQS/MSS QUES ERROR (128) (64) (32) (16) This register is affected by the RPM3 reply output queue, the error queue, the standard event status register the ready event status register, and the STATus subsystem: status byte register...

  • Page 106: Table 21 Standard Event Register

    RPM3™ OPERATION AND MAINTENANCE MANUAL • MSS: Master Summary Status Bit 6 (64) Indicates that an event or events occurred that caused the RPM3 to request service from the Host, much like the RQS bit. Unlike the RQS bit, it is READ ONLY and can be only cleared when the event(s) that caused the service request are cleared.

  • Page 107: Table 22 8 Bit Rpt Ready Status Register

    4. REMOTE OPERATION • EXE: Execution Error Bit 4 (16) Indicates if a remote program message cannot be processed due to device related condition. • DDE: Device Dependent Error Bit 3 (8) Indicates that an internal error has occurred in the RPM3 such as a transducer time-out.

  • Page 108: Operation Register Structure

    RPM3™ OPERATION AND MAINTENANCE MANUAL • ERR1: RPT error Bit 3 (8) Indicates that the high RPT (channel1) has exceeded the maximum pressure for the current high RPT range. • MEAS1: Measurement complete Bit 2 (4) This bit is set when the high RPT (channel1) measurement is complete. You do NOT have to initiate the measurement cycle to use this bit.

  • Page 109: Figure 13 Illustration Of This Structure Duplicated For Each Of The Operation, Instrument, And Isummary Registers

    4. REMOTE OPERATION FROM EVENTS P T R a n s i t i o n C O N D i t i o n N T R a n s i t i o n E V E N t E N AB l e →...

  • Page 110: Figure 14 Relationship Of The Operation Register And Its Support Registers

    RPM3™ OPERATION AND MAINTENANCE MANUAL : I S U M ma r y1 b 0 : n / a : O P E R a t i o n b 1 : n / a b 0 : n / a b 2 : r a n g i n g b 1 :...

  • Page 111: Questionable Register Structure

    4. REMOTE OPERATION 4.5.2.2 QUESTIONABLE REGISTER STRUCTURE The QUEStionable status register has only one bit that is used by the RPM3. Bit13 is set by either bit0 or bit1 of the questionable instrument event register. These bits are in turn set whenever enabled bits of either the ISUMmary1 or :ISUMmary2 registers are set.

  • Page 112: Figure 15 Illustration Of This Structure Duplicated For Each Of The Operation, Instrument, And Isummary Registers

    RPM3™ OPERATION AND MAINTENANCE MANUAL From Events P T R a n s i t i o n C O N D i t i o n N T R a n s i t i o n E V E N t E N AB l e b 0 : →...

  • Page 113: Figure 16 Relationship Of The Questionable Registers And Its Support Registers

    4. REMOTE OPERATION : I S U M ma r y1 b 0 : n / a b 1 : n / a Q U E S t i o n a b l e b 0 : n / a b 2 : n / a b 1 :...
  • Page 114 RPM3™ OPERATION AND MAINTENANCE MANUAL © 1998-2002 DH Instruments, Inc. Page 106...

  • Page 115: Introduction

    5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION INTRODUCTION RPM3 was designed for maintenance free operation. No maintenance is required other than: • Rezeroing of reference transducers (RPT) as needed (see Section 3.2.9) • Regular reference transducer calibration (see Section 5.2) • Adjustment of the on-board barometer as needed (see Section 5.3) This section provides information on maintenance, adjustment and calibration procedures, certain repair functions and recommended overhaul procedures.

  • Page 116: Pa/Pm Coefficients

    RPM3™ OPERATION AND MAINTENANCE MANUAL Independent range calibration also makes it possible to calibrate only certain ranges if ranges are on different calibration intervals or NOT all ranges are needed. The normal calibration process for absolute RPTs has a second step which is the determination of the value of ZNATERR (see Sections 5.2.1.2 and 5.2.6).

  • Page 117: Order Of Operations

    5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION Setting ZNATERR is procedurally identical to running the AutoZ function but the result is changes to the ZNATERR value rather than the ZOFFSET value. The ZNATERR setting procedure is prompted automatically by CalTool software. It can also be run separately by pressing [SPECIAL] and selecting <4Internal>, <2Cal>.

  • Page 118: Set-Up And Preparation

    RPM3™ OPERATION AND MAINTENANCE MANUAL RPM3 RPTs are NOT sensitive to gas density so any non-corrosive gas may be used for calibration. • Accuracy of ± 0.0035 % (0.01 % for b type RPTs) of reading or better, if best RPM3 accuracy is to be obtained. A lower accuracy standard may be used but RPM3 accuracy may be degraded proportionally from published specifications (see Section 1.2.2).

  • Page 119: Rpt Calibration Using Caltool For Rpts Software

    5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION Set the RPM3 on a stable surface near the calibration standard at a height as close as possible to the calibration standard's reference height. Consider the connections that may need to be made to the rear panel and access to the front panel display and keypad. Connect the calibration standard output to the RPM3 rear panel TEST port (1/8 in.

  • Page 120: Setting Znaterr

    RPM3™ OPERATION AND MAINTENANCE MANUAL OPERATION Activate the desired range from the main run screen using [RANGE] (see Section 3.2.1). Then, to view or edit calibration information for the active range, press [SPECIAL], and select <6Cal>, <1RPT>. Select <1view> or <2edit>. The <1view>...

  • Page 121: Rpt Calibration/Adjustment Without Caltool For Rpts Software

    5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION To set ZNATERR for the active range press [SPECIAL] and select <6Cal>, <1RPT>, <3run ZNATERR>. Procedurally, running ZNATERR is identical to running AutoZ (see Section 3.2.9). Changing the value of ZNATERR between RPT calibrations may invalidate the autozero function for that range.

  • Page 122: Adjustment Of On-Board Barometer

    RPM3™ OPERATION AND MAINTENANCE MANUAL Perform a linear regression to find the offset and slope that best fit the non-corrected RPM3 readings to the calibration standard pressures. The offset is the new value of PA, the slope is the new value of PM. Press [SPECIAL] and select <6Cal>, <1RPT>, <2edit>...

  • Page 123: Reloading Embedded Software Into Flash Memory

    5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION procedure, the calibration procedure must be performed last as other overhaul procedures may affect RPT calibration. Any or all of the following items may be included as part of a system maintenance overhaul: • Clean front panel. •...

  • Page 124: Subassembly Description And Location

    RPM3™ OPERATION AND MAINTENANCE MANUAL SUBASSEMBLY DESCRIPTION AND LOCATION 5.6.1 INTERNAL VIEW 1. SDS module (may be single, dual channel, 5. Power Supply or NOT present depending on RPTs. Dual 6. On-board barometer (on main board) channel shown here) 7. Micro board 2.

  • Page 125: Rpts

    5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION 3.2.8 and 3.4.2. For additional information on RPM3 RPT dependent configurations, see Section 1.2.3. 5.6.1.2 RPTS Four different RPT mechanical configurations are available for RPM3: b Type RPT: A rectangular black box. Standard RPT: Up to A1000: rectangular, foam boot.
  • Page 126 RPM3™ OPERATION AND MAINTENANCE MANUAL © 1998-2002 DH Instruments, Inc. Page 118...

  • Page 127: Table 23. Rpm3 Troubleshooting Symptom / Probable Cause / Solution List

    6. TROUBLESHOOTING OVERVIEW RPM3 is a sophisticated pressure setting and measuring instrument with advanced on-board features and functions. Before assuming that unexpected behavior is caused by a system defect or breakdown, the operator should use this manual and other training facilities to become thoroughly familiar with RPM3 operation.
  • Page 128 RPM3™ OPERATION AND MAINTENANCE MANUAL SYMPTON PROBABLE CAUSE SOLUTION Bottom line of display is blank. DISPLAY mode is clean. Operation is normal. Use [DISPLAY] to change bottom line display if desired (3.2.6). Pressure display is flashing and beeper Current upper limit of active range has Reduce pressure applied to TEST port is sounding.
  • Page 129 6. TROUBLESHOOTING SYMPTON PROBABLE CAUSE SOLUTION SDS was left OFF on one RPT when When ranges are switched from one Operation is normal (3.1.2.6, 3.2.8, and ranges were changed. When you come RPT to another, SDS is always turned 3.4.2). back to it, it is ON again.
  • Page 130 RPM3™ OPERATION AND MAINTENANCE MANUAL © 1998-2002 DH Instruments, Inc. Page 122...

  • Page 131: Pressure Unit Conversions

    7. APPENDIX PRESSURE UNIT CONVERSIONS RPM3 performs all internal calculations in SI units. Numerical values input or output in other units are converted to SI immediately after entry and back to other units just before output as needed. Table 24 provides the conversion coefficients used by RPM3 to convert numerical values expressed in SI units to corresponding values expressed in other units.

  • Page 132: Warranty Statement

    RPM3™ OPERATION AND MAINTENANCE MANUAL WARRANTY STATEMENT Except to the extent limited or otherwise provided herein, DH Instruments, Inc. warrants for one year from purchase, each new product sold by it or one of its authorized distributors, only against defects in workmanship and/or materials under normal service and use.
  • Page 133 8. GLOSSARY Measurement mode in which the RPT indicates absolute pressure (difference from Absolute Mode vacuum). Active RPT The RPT of which a range is currently the active range. The on-board barometer reading. ATM Ref ATMOFFSET The difference between the reading of the on-board barometer at the last tare and the current reading of the on-board barometer.
  • Page 134 RPM3™ OPERATION AND MAINTENANCE MANUAL An RPM3 feature that automatically adjusts the pressure reading and display update rate as a ReadRt or Automated function of the rate of change of the measured pressure. Read Rate Ready <*>/Not Ready Indication of when pressure is stable within stability limit. (<↑>...

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