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. This instrument is not to be operated in any other manner than that specified by the manufacturer.
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
MULTIPE RANGES (Q-RPTS, AUTORANGE AND INFINITE RANGING) ..........19 3.2.4 PARALLEL MEASUREMENT MODE ......................21 3.2.5 USING RPM4 WITH A PPC3 CONTROLLER/CALIBRATOR ..............21 3.2.6 USE OF THE 12VDC BATTERY/CHARGER PACK ................... 23 3.2.7 SDS SELF DEFENSE SYSTEM ........................24 3.2.8...
Page 5
TABLE OF CONTENTS R E M O T E O P E R A T I O N ............8 1 OVERVIEW ............................
Page 6
RPM4™ OPERATION AND MAINTENANCE MANUAL T R O U B L E S H O O T I N G ............1 3 1 A P P E N D I X .
Table 1. Reference Pressure Transducer (Q-RPT) Module Designations and Ranges ......3 Table 2. RPM4 Packing List ......................... 7 Table 3. Position Designators of Q-RPTs in an RPM4 System ..............20 Table 4. Settings and What They Are Specific To (Range, Measurement Mode, Q-RPT, System) ..21 Table 5.
Page 8
Figure 6. Status Register Schematic ....................... 109 Figure 7. Internal View ..........................127 Figure 8. Pneumatic/hydraulic schematics of RPM4 with Single Q-RPT Module ........129 Figure 9. Pneumatic/hydraulic schematics of RPM4 with Two Q-RPT Modules ........130 Figure 10. Remote [ENT] Connector Schematic ..................135...
Before using the manual, take a moment to familiarize yourself with the Table of Contents structure: Sections 1, 2 and 3 should be read by all first time RPM4 users. Section 3 is most important for those using the local front panel interface but should be read over by all users to familiarize themselves with general RPM4 operating principles.
Page 10
RPM4™ OPERATION AND MAINTENANCE MANUAL Page VIII...
ASCII character command strings transmitted over its standard RS232 or IEEE-488.2 interface. RPM4 models are available in ranges from as low as - 3 to 3 kPa (0.4 psi) to as high as 280 MPa (40 000 psi) in absolute, gauge, compound gauge and differential measurement modes.
1.2.2.1 QUARTZ REFERENCE PRESSURE TRANSDUCER (Q-RPT) RPM4 can be configured with one or two quartz reference pressure transducer (Q-RPT) modules to measure pressure. The type (Axxx, Gxxx, BGxxx, BAxxx) and range of the Q-RPT module(s) determines the RPM4 measurement specifications.
Q-RPTs of A10M and lower are available with two different performance levels, STANDARD class and PREMIUM class. See the product label on the RPM4 rear panel, the Q-RPT module label on the rear panel and/or the product calibration reports to determine the class of the Q-RPT(s) installed in RPM4.
RPM4™ OPERATION AND MAINTENANCE MANUAL Warm Up Time 30 minute temperature stabilization recommended from cold power up. Resolution To 1 ppm, user adjustable Compensated Temperature Range 5 to 35 °C Acceleration Affect ± 0.008 % /g maximum, worst axis Allows operation at ± 20° from reference plane without significant effect Predicted One Year Stability ±...
1. INTRODUCTION 1.2.3 BATTERY AND CHARGER PACK Power Requirements 100 to 240 VAC, 50/60 Hz, 15 W max consumption Operating Temperature Range 0 to 50 °C Storage Temperature Range - 20 to 50 °C Vibration Meets MIL-T-28800D Weight 2 kg (4.4 lb) 8 cm H x 22.5 cm W x 20 cm D (3.1 in.
Page 16
RPM4™ OPERATION AND MAINTENANCE MANUAL Page VI...
UNPACKING AND INSPECTION 2.1.1 REMOVING FROM PACKAGING RPM4 is delivered in a corrugated container with polyethylene inserts to hold it in place; or in the optional molded, medium density polyethylene shipping case with a custom foam insert for holding the RPM4.
SITE REQUIREMENTS Install RPM4 on a flat, stable surface at a convenient height. The front feet can be extended so that the unit can be inclined for easier viewing. The RPM4 can also be mounted in a standard 19 in. rack mount using the optional rack mount kit.
BATTERY PACK Charge the battery pack fully (see Section 3.2.6). Connect the RPM4 12VDC power connection on the rear panel of the RPM4 to the 12 VDC power connection on the battery/charge pack using the cable supplied with the pack.
Using a pressure connecting hose or tube of appropriate pressure rating, connect the device or system to be tested to the RPM4 TEST(+) port. The RPM4 TEST(+) connection is 1/8 in. NPT female (Q-RPTs of A70M or lower) or DH500 F (Q-RPTs higher than A70M).
2.3.6 THE VENT OR ATM PORT RPM4 Q-RPT modules of A7M and lower have a VENT port. The VENT port is connected to the TEST(-) port when SDS is CLOSED (see Section 5.6, Figure 8). For Axxx and BGxxx Q-RPTs, the RPM4 on-board barometer, is connected to the VENT port when SDS is CLOSED.
2.4.1 SWITCH POWER ON Actuate the power switch on the RPM4 rear panel (if a 12 VDC power supply is already connected to the 12 VDC connection, RPM4 power is already on). Observe the front panel display as RPM4 initializes, error checks and goes to the MAIN RUN screen (see Section 3.1.1).
(see Section 1.2.2.1) Repeat this process for both Axxx (absolute) Q-RPTs if there are two in the RPM4. . If a Q-RPT does not agree within tolerance, it may need to be AutoZeroed (see Section 3.3.9), calibrated (see Section 5.2) or repaired.
RPM4™ OPERATION AND MAINTENANCE MANUAL SHORT TERM STORAGE The following is recommended for short term storage of RPM4: Vent the RPM4 test port Switch power OFF. Page 14...
Figure 3 and its legend summarize the RPM4 MAIN RUN screen fields and their functions. RPM4 has a screen saver function which 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 time can be changed or screen saving can be completely suppressed (see Section 3.5.5.1).
8. DISPLAY Information FUNCTION specific to depending on current and sign. the DISPLAY RPM4 DISPLAY <PPC3 EXT DEV:> when the RPM4 mode function. Leading is initialized as an external device character identifies to a PPC3 pressure controller. the value 9. D...
3. OPERATION 3.1.2 FUNCTION / DATA KEYPAD LAYOUT AND PROTOCOL The RPM4 has a function/data keypad for local operator access to direct functions, function menus and for data entry. 1. The Function/Data keys allow very commonly 3. The Menu/Data keys provide access to...
The optional remote ENTER function is a switch that duplicates the function of the front panel [ENT] key. The remote ENTER function is serviced by a connector on the RPM4 rear panel. An optional footswitch is available to activate remote entry hands free or a different switch may be used.
MULTIPE RANGES (Q-RPTS, AUTORANGE AND INFINITE RANGING) An RPM4 may have one or two Q-RPTs. Position indication of the currently active Q-RPT is continuously displayed in the upper right hand corner of the MAIN RUN screen and most other screens. See Table 3 for position designation protocol for the Q-RPTs in an RPM4.
(see Section 3.4.1). AN RPM4 range is identified by a range screen showing the Q-RPT used by the range, its current unit of measure and its full scale pressure in gauge and absolute (if available) measurement modes.
Close SDS on all Q-RPT modules on which SDS is available (see Section 3.2.7). Head If the RPM4 TEST port is at a different level than the PPC3’s TEST port AND the RPM4 will be used in absolute measurement mode, set the RPM4 head height to the PPC3’s TEST port level so that RPM4 is corrected to indicate the pressure at...
Page 32
<PPC3 EXT DEV: ACTIVE> (if RPM4 is initialized by PPC3 and is currently in use) After using an RPM4 as an external device for a PPC3, cycle power to return to the previous RPM4 settings, restore front keypad capability and return to the normal main run screen.
OFF for 12VDC power to be output). When RPM4 is connected to both a 12 VDC source and an AC source,if the RPM4 power switch is OFF, the 12VDC source supplies the RPM4; if the RPM4 power switch is ON, the 12 VDC source is disconnected and the AC source supplies the RPM4.
10 MPa (1 500 psi). When an RPM4 is used as an external device to a PPC3 pressure controller, PPC3 controls the RPM4’s SDS to isolate the RPM4 Q-RPTs from the test pressure when they are not in use.
An RPM4 range is defined as a pressure span and associated settings (see Section 3.2.3). An RPM4 may have multiple ranges. Each Q-RPT in the RPM4 system has a default range which is its maximum span. Additional ranges, lower than the Q-RPT’s maximum span, may also be created using AutoRange (see Section 3.3.4).
Section 3.3.3. PRINCIPLE RPM4 allows the unit of measure in which pressure values are displayed to be changed. RPM4 supports 15 standard pressure units of measure as well as user defined units. To simplify operation, quick access to six units is made available under the [UNIT] key.
The default pressure units of measure available under the UNIT function depend on whether the RPM4 has been set up as an SI or US version (indicated by SI or US at bottom right of introduction screen). The choice of six units available under the UNIT function can be customized from a wider selection by the user (see Section 3.5.6).
Page 38
RPM4™ OPERATION AND MAINTENANCE MANUAL Gauge Measures pressure relative to atmosphere (zero is ambient pressure). Range is from zero gauge to full scale, full scale must be greater than zero. Negative Gauge Measures pressure relative to atmosphere (zero is ambient pressure).
<Gauge RPT, gauge mode only> is displayed. If the Hi Q-RPT is active in its default range (<DF>), and the RPM4 has two Q-RPTs of the same type (Axxx, Gxxx, BGxxx), differential measurement mode is available in addition to the other modes (see Section 3.3.3.1).
To automatically set up RPM4 to optimize its measurement characteristics and features for specific, user specified range of operation. PRINCIPLE RPM4 is designed to support the calibration and test of a very wide variety of test ranges in various measurement modes. Page 30...
AutoRange or erased when another range is selected. Press [ENT] from the main run screen in RATE mode to use the [AutoTest] function to AutoRange RPM4 based on DUT tolerance (see Section 3.3.10). Table 6. Settings Made by AutoRange...
Page 42
Gauge mode only if the Q-RPT is a Gxxx or BGxxx or an Axxx with absolute mode turned off. If the RPM4 has two Q-RPTs and you would like to select the other one for the AutoRange, the cursor control keys may be used to toggle between Q-RPTs selections if both Q-RPTs can handle the specified AutoRange.
The LEAK CHECK function is provided as a means of checking and quantifying the leaks that may be present in the system connected to the RPM4’s active Q-RPT test port. The principle of the LEAK CHECK function is the measurement of the natural decrease or increase of pressure in a fixed volume over time.
To view the results of the most recently completed leak check, press <2view>. If NO leak check data is stored (i.e., if the RPM4 has never run a leak test or a reset has cleared previous leak test results), the results screen displays <Data NOT available> briefly and returns to MAIN RUN screen.
Page 45
CLEAN Blanks out the second line of the display (see Section 3.3.6.7). This function is used when a simple display of pressure measured by the RPM4 active range without additional information is desired. OPERATION To set the DISPLAY function press [DISPLAY] from the main run screen.
(if RPM4 is initialized by PPC3 and is currently in use) After using an RPM4 as an external device for a PPC3, cycle power to return to the previous RPM4 settings, restore front keypad capability and return to the normal main run screen.
To activate the Rate DISPLAY. See Section 3.3.6 [DISPLAY], Principle. The AutoTest function (see Section 3.3.10) to AutoRange RPM4 based on DUT characteristics and run an automated test sequence is accessed by pressing [ENT] from the Rate run screen.
RPM4™ OPERATION AND MAINTENANCE MANUAL The Rate DISPLAY is the default display except in differential measurement mode in which the default DISPLAY is RPT. To go to a DISPLAY other than Rate, press [DISPLAY] and make a new DISPLAY choice (see Section 3.3.6).
[DISPLAY], <4RPT> is pressed. If the RPM4 is in parallel (<HL>) (see Section 3.5.7.3) mode in which both Q-RPTs are used simultaneously, when <4RPT> is selected, the Q-RPT to display on the lower display line must be specified.
RPM4™ OPERATION AND MAINTENANCE MANUAL If the inactive RPT is equipped with SDS Self Defense System (see Section 3.2.7), SDS will almost certainly be CLOSED when the RPT DISPLAY is activated. SDS can be OPENED on the inactive RPT using [SPECIAL], <4SDS> (see Section 3.5.4).
DISPLAY first activated). Pressing [ENT] causes the current pressure measured by the active RPM4 Q-RPT to be captured and displayed. If the pressure measurement unit, mode or range is changed while the Freeze DISPLAY is active, the Freeze value defaults back to zero.
PURPOSE To cause a pressure fluid head correction to be added to or subtracted from the pressure measured by the RPM4 reference pressure transducer in order to predict the pressure at a height other than the RPM4’s reference level.
RPM4 and negative if it is lower. The HEAD function is NOT range specific. The HEAD ON or OFF status remains the same as Q-RPTs and ranges are changed.
Page 54
TEST(+) port to be measured. The [SDS] key is used to OPEN SDS. The SDS function can also be used to CLOSE SDS as might be desired when leaving RPM4 at rest or when a possible overpressure situation is anticipated. Pressing [SDS] always CLOSES any SDS systems that are OPEN.
Page 55
3. OPERATION Use [SDS] to OPEN SDS if it is CLOSED for the active Q-RPT and/or to CLOSE SDS for the active and inactive Q-RPT. When [SDS] is pressed, there are three possible results depending whether the active Q-RPT is SDS equipped and ON (see Section 3.5.4.2), and whether its SDS is OPEN or CLOSED.
In differential and parallel measurement modes, opening SDS opens SDS for BOTH the Hi and Lo Q-RPTs. Before opening SDS, be certain that the pressure applied to both the Hi and Lo RPM4 TEST(+) ports is less than the maximum pressure of the Lo Q-RPT.
Before running AutoZ in gauge mode, ensure that the pressure applied to the Q-RPT is truly zero gauge (atmospheric pressure). If running AutoZ in gauge mode results in a zero offset that RPM4 considers unusually large, <Confirm 0 gauge P!> is displayed when AutoZ is pressed. Check that zero...
DHI RPMx connected to RPM4’s COM2 communications port. Selecting <3Lo RPT> is shown only if the active Q-RPT is Hi and there is a Lo Axxx Q-RPT in the RPM4. This selection allows the value of P for the Hi std,0 Q-RPT to be read automatically from the RPM4s Lo Q-RPT.
Page 59
Enter the value of the AutoZ reference (P ) in the same unit of measure as the std,0 top line display and press [ENT]. RPM4 logs the reading and calculates a new AutoZ offset value. The next display is: Press [ENT] to activate the new value of Old P : 0.0 Pa...
Page 60
AutoZ by Lo RPT is available only if the active Q-RPT is the Hi Q-RPT and there is an Axxx Lo Q-RPT. AutoZ by Lo RPT allows the Lo Q-RPT in an RPM4 to serve as the AutoZ reference (source of P ) (see Section 3.5.1, ...
3.3.10 [ENT] (RUN AUTOTEST) PURPOSE To run the AutoTest function which AutoRanges the RPM4 and runs a calibration test based on user entries of pressure unit, measurement mode, full scale, increment and DUT tolerance. Run AutoTest is accessed by pressing [ENT] from the Rate or Clean DISPLAY mode (see Section 3.3.6.2).
Feature not available at the time of release of this manual. [SETUP] PURPOSE [SETUP] accesses a menu of functions and features commonly used in setting up and using RPM4. OPERATION To access the SETUP menu, press [SETUP] from the MAIN RUN 1range 2res 3stab screen.
PRINCIPLE The resolution with which RPM4 displays pressure values can be adjusted. This feature can be used to reduce the resolution when lower precision measurements are being made and excess resolution might confuse or distract the operator.
See Section 3.2.1 Pressure Ready/Not Ready Indication. PRINCIPLE RPM4 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 3.2.1 Pressure Ready/Not Ready Indication). 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.
This feature is often used to help protect an external device or system on which RPM4 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.
Page 66
3 seconds on/2 seconds off intervals. Change the pressure applied to RPM4 so that it is within the upper and/or lower limit to return to normal operation. Upper limit values are specific to each range and measurement mode. Be careful not to assume that the upper limit set in one measurement mode will apply to the other.
This feature not available at the time of this manual’s release. Check www.dhinstruments.com for new RPM4 embedded software releases and manual updates. [SPECIAL] PURPOSE [SPECIAL] accesses a menu of RPM4 functions and features that are less commonly used or not normally used in regular operation. OPERATION 1AutoZ 2remote 3head...
PRINCIPLE AutoZ Purpose and Principle The main component of the change over time of the RPM4 Q-RPTs is change in zero or offset, independent of span. Offsetting or “rezeroing” RPM4 Q-RPTs relative to a reference between recalibrations allows measurement uncertainty specifications to be maintained with less frequent full calibrations.
Page 69
AutoZeroed. For higher range Q-RPTs, this is easily accomplished with a variety of digital barometers or with a Lo Q-RPT in the RPM4. For lower range Q-RPTs, a piston gauge or other standard may be required to provide P with low enough uncertainty.
In gauge measurement modes, AutoZ is run when initiated by the operator pressing [AutoZ] when the RPM4 is vented. This assures the regular automated updating of the P value. offset,G AutoZ in differential measurement mode RPM4s with two Q-RPTs of the same type (Axxx, Gxxx, BGxxx) support differential measurement mode (see Section 3.3.3.1) in which the measured pressure is the difference...
Page 71
(such as a DHI PG7601) applying atmospheric pressure to the RPM4 test port. The best day to day reference is a properly calibrated DHI RPM4 with a BA100K Q-RPT interfaced directly as an external device to the RPM4 COM2 port.
COM2 communications. To select the remote programming communications format. PRINCIPLE The RPM4 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.
The receiving terminating character must be a line feed and EOI. Carriage returns are ignored if received. The RPM4 sends a line feed and asserts the EOI line to terminate a reply. These settings are fixed to agree with IEEE Std. 488.2. If you change the address, the IEEE interface will reset (PON) and become idle.
RPM4™ OPERATION AND MAINTENANCE MANUAL 3.5.2.4 <5RS232 SELF-TEST> The RS232 self-test is provided to check the RPM4 COM ports and the interface cable independently of an external device or computer. If you are having difficulty communicating with RPM4 from a host computer using RS232, the RS232 self test can help establish that the RPM4 COM1 port you are trying to communicate with and the interface cable you are using are good.
SDS on either the Hi or Lo Q-RPT (see Section 3.5.4.1), and; b) turning OFF SDS so that it is open full time and RPM4 can be operated as if SDS were not installed (see Section 3.5.4.2).
SDS overpressure function (see Section 3.4.4.1) remains active. To turn SDS full time ON or OFF for a Q-RPT module, press [SPECIAL], <4SDS>, <2full time on/off >. If the RPM4 has two Q-RPTs and both have SDS, the Q-RPT must then be selected. The next display is: The cursor is on the current state of SDS for the designated Q-RPT.
PRINCIPLE RPM4 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. The default is for the screen saver to activate after 10 idle minutes. The screen saver activation time can be adjusted by the user or screen saving can be completely eliminated.
TIME and DATE function to set your local time and date. 3.5.5.4 <4ID> PURPOSE To view or edit the RPM4 user ID and to view the RPM4 serial number. OPERATION To access the ID function press [SPECIAL] and select <5prefs>, <2ID>. Select <1view> to view the current ID.
Page 79
RPM4 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.
The first field, <nnnn>, is the serial number of the RPM4, followed by a second field, <xx>, that represents the number of times that a secondary password has been used. The second field, <xx>, increments each time a secondary password is used.
The [UNIT] function key makes available a choice of six default pressure units (US or SI units depending on whether the RPM4 has been factory set as US or SI) (see Section 3.3.2). RPM4 also supports many commonly used units other than those included in the default set up.
View the RPM4 incident log (see Section 3.5.7.5). 3.5.7.1 <1BARO> PURPOSE To view the value of atmospheric pressure as measured by the RPM4 on-board barometer. There is no on-board barometer in RPM4s that have G100K or G200K Q-RPTs only”. ...
RPM4™ OPERATION AND MAINTENANCE MANUAL OPERATION RPM4’s that have only G100K or G200K Q-RPTs (no Axxx, G15K or BG15K) are NOT equipped with an on-board barometer. To view the current reading of the on-board barometer press [SPECIAL], <7internal>, <1baro>. The display is in the active pressure unit of measure (see Section 3.3.2).
Selecting <2off> turns OFF the automated reading rate and returns to the MAIN RUN screen. The default RPM4 condition is auto read rate ON. The read rate can be set to a fixed value between 200 ms and 20000 ms using the remote command “READRATEn”...
<4LO VNT> PURPOSE To cause an RPM4’s Gxxx or BGxxx Q-RPT TEST(-) vent valve to stay open or closed rather than open and close automatically. This feature is active only when the active Q-RPT is a Gxxx (gauge) or BGxxx (bi-directional gauge) Q-RPT.
(<Auto TEST(-) vent>) or has been set manually (<Manual TEST(-) vent>) followed by the current valve status (<Open> or <Close>). If the RPM4 is being used as an external device to a PPC3 pressure controller (see Section 3.5.7.4), the Lo Vent setting may be changed from the PPC3 (see the PPC3 Operation and Maintenance Manual).
This clears any settings that the user has made, and should be used only to restore the RPM4 to a known state. RPM4 goes through its power up sequence after any type of reset is executed.
PURPOSE Sets the six pressure units available under the UNIT function to the SI or US default selections depending on whether the RPM4 has been factory set for SI or US (see Section 3.3.2). Sets the user defined unit to 1.000/Pa (see Section 3.5.6).
Combines all resets in one global reset command that clears the entire user section of non-volatile memory except the ID function (see Section 3.5.5.4) and the security level password (see Section 3.5.5.5) returning RPM4 to the “as delivered” condition. The Reset – All resets are itemized in Table 13.
Sending a program message to the RPM4 places it into remote mode. The remote indicator to the right of the display window lights when the RPM4 is in remote mode. It also flickers when a program message is received. The menus usually accessed from the front panel are locked out while in remote. The [ESC] key returns the RPM4 to local operation unless the <REMOTE>...
The main difference between the “classic” and “enhanced” formats is that when using the IEEE-488 interface, a query operator “?” must be included in an enhanced command to yield a reply from the RPM4. When using the COM1 port in classic or enhanced mode or using the IEEE-488 port in classic mode, every command has a reply which the host must wait for before continuing.
RPM4 in the form of comma delimited arguments. This data is usually a setting of some sort that is stored in the RPM4. If data is specified, it must be preceded by at least one white space from the program message header and be within the range and format described in the program message description.
You must wait for a reply with a query. If you send any type of program message to the RPM4 after a query before receiving a reply, the program message is discarded and an error is generated. Errors are reported using the IEEE Std.
The “RANGE” or “ARANGE” command can be used to select the “Active” Q-RPT. There are some limitations to use of the suffix when the RPM4 is in differential mode (see Section 3.3.3.1) or the “HL” Q-RPT is active (see Section 3.2.4). See the program message descriptions for suffix use with a specific command.
RPM4™ OPERATION AND MAINTENANCE MANUAL COMMAND DESCRIPTION ‘n’ indicates an optional suffix Read or set the upper limit for the current range. Read or set the pressure unit of measure for the current range. UNITn Read the RPM4 software version.
“Active Q-RPT” is the Q-RPT that is currently displayed on the top line of the front panel of the RPM4, and is identified by the text label in the upper right of the pressure display screen. The last Q-RPT ranged or selected using the “RANGE” or “ARANGE” commands is the “Active” Q- RPT.
The RPM4 COM2 port can be used to communicate to another RS232 device (such as another RPM4). This allows the user to use a single COM port or IEEE-488 port on the host computer to communicate with the RPM4 and another RS232 device. A carriage return and a line feed (<CR><LF>) are added to the string.
Page 99
The optional suffix or the “RptLabel” argument can be used to specify which Q-RPT you wish to use for the AutoRange range instead of allowing the RPM4 to pick the best Q- RPT. By using this option you can override the internal logic that picks the most suitable Q- Q-RPT.
Page 100
’0’ Autozero OFF ’1’ Autozero ON Remarks The RPM4 AutoZ function can be turned ON and OFF. There is a separate AutoZ flag for the gauge, absolute, and differential measurement modes for each Q-RPT. This command sets the AutoZ status for the current mode of the specified or the active Q-RPT only.
Page 101
COM1 settings. A 250ms or longer delay after receiving the reply to this command will ensure that the RPM4 has changed the COM port settings and is ready for communications at the new settings.
Page 102
Q-RPT’s measurement without further queries. This continues until the next query is received by the RPM4, or if the ABORT” or “*CLS” command is received. The frequency of the measurements is determined by the readrate of the Q-RPT. The data returned includes the pressure of the specified or active Q-RPT, current unit of measure and measurement mode.
Page 103
The fluid type. This must be “N2”, “Air”, “He”, “Oil”, “H2O”, or “User”. Remarks The RPM4 can make a fluid head correction to allow it to display the pressure at a level other than the reference level of the RPM4.
Page 104
Remarks The user can select the type of remote command format using these simplified commands. There is no query format. This format must agree with the format sent to the RPM4. This command is a replacement for the “MSGFMT” command.
Page 105
“MEM” Remarks The RPM4 system memory stores the user settings (units, resolution) and retains them when the unit is OFF. On power-up, this memory is checked. If this memory is corrupted, all user settings are reset to default , and the MEM status is set to reflect this.
Page 106
Gxxx or BGxxx Q-RPTs each have a low vent valve that is used to vent the TEST(-) port. This valve is normally controlled automatically depending on current RPM4 operation but it can be commanded to open or close using the “NVENT” command.
Page 107
After receiving this program message, the RPM4 replies back with the data after a new pressure measurement cycle is complete. This can take up to the current read rate period (1.2 seconds by default).
Page 108
This is followed by the current pressure unit of measure. atm: The pressure measured by the RPM4 on-board barometer in the current pressure unit (and always absolute). This is followed by the current pressure unit. Not all RPM4s are equipped with an on-board barometer. This field is missing if the RPM4 is not equipped with an on-board barometer.
Page 109
Q-RPTs selected with this command are used with their full default pressure range. The reply indicates the active range in psi if the RPM4 is a “US” version or in kPa if the RPM4 is an “SI” version. Used as a simple query, the active range is returned, which can be an AutoRanged range or a default range (see “ARANGE”...
Page 110
Set to ‘0’ to enable automatic read rate. Remarks The RPM4 can have the speed in which it integrates each measurement (“read rate”) automatically adjusted based on the rate, or it can manually set to a fixed period. Increasing the read rate increases the reply time for pressure and rate queries.
Page 111
Classic “RESET” Remarks The RPM4 has user settings (units, resolution, etc.) that can be reset to factory defaults. remote “RESET” program message corresponds to the front panel “Reset - Sets”. System calibration coefficients and communications settings are not affected. The reset cycle takes up to 3 seconds to complete.
Page 112
Up to two (three including the HL Q-RPT which is a combination of the Hi and Lo) internal Q- RPTs can be available for use in an RPM4. You can query the RPM4 for information about each particular Q-RPT. The Q-RPT data is returned in the following format:...
Page 113
SDS is closed. If a Q-RPT’s SDS is full time “OFF”, then it is not be affected by this command. The status of the active Q-RPT’s SDS system is replied. If the RPM4 is in differential mode or the HL Q-RPT is active, then this command opens or close both the Hi and Lo SDS at the same time, unless the SDS is full time “off”.
Page 114
RPM4™ OPERATION AND MAINTENANCE MANUAL Purpose To read the serial number of the RPM4. Query “SN?” Classic “SN” Remarks The RPM4 is serialized. The serial number can be read using this program message. Example Query sent: “SN?” (enhanced) Query reply: “321” Example Sent: “SN”...
Page 115
Specify the HL Q-RPT if the HL Q-RPT is active Remarks The RPM4 handles all pressure values internally in Pascal. The coefficient replied is equivalent of 1 Pa in the current pressure unit of measure. This program message allows the...
Page 116
Remarks The RPM4 has an upper limit for each range and for each measurement mode (gauge, absolute, and differential). If the pressure does exceed the upper limit, the pressure display flashes. This feature should always be used to prevent accidental over pressure of a device under test.
Page 117
“VER?” Classic “VER” Remarks The software version of the RPM4 can be read. This is useful for checking for the presence of the RPM4 and for reference purposes. It indicates the internal Q-RPT(s) and software version. Example Query sent: “VER?”...
4.5.1 ERROR QUEUE The RPM4 keeps track of remote errors by using an error queue. If an error occurs, it is pushed onto the Error Queue. If you are using the COM1 port, the error number is immediately replied in the form “ERR#nn where nn is the error code from 0 to 99. The “ERR?” (or “ERR”) query can then be used to pull the error from the Error Queue in it’s descriptive text format.
Indicates that the SRQ line of the IEEE-488 interface has been asserted by the RPM4. This bit is cleared when a serial poll is performed on the RPM4, and is a part of the Status Byte Register when read using a serial poll. This bit does not apply if the COM1 port is being used.
ESB bit. The description of these bits are given as: Power On Bit 7 (128) Indicates that the RPM4 power has been cycled since the last time this bit was read or cleared.
IEEE STD. 488.2 COMMON AND STATUS PROGRAM MESSAGES The RPM4 supports a set of commands that are common to all instruments conforming to IEEE Std. 488.2. These command make it easy to perform basic function for any device that supports these commands.
“∗OPC” Query “∗OPC?” Remarks This Command enables the RPM4 to set the OPC bit in the Standard Event Status Register when it has completed all pending functions. The Query replies with a “1” when all functions are complete. Example Sent: “∗OPC”...
Page 123
(as if the “∗RST” program message was executed), and the ∗TST query will return a non zero value. If the RPM4 passed the test on power-up OR if the ∗TST query was used at least once since the RPM4 was powered up the reply will be a ‘0’.
Page 124
RPM4™ OPERATION AND MAINTENANCE MANUAL Page 114...
For rapid assistance in specific situations see Chapter 6 for troubleshooting information. RPM4 is covered by a limited one (1) year warranty. Unauthorized service or repair during the warranty period is undertaken at the owner’s risk and may cause damage that is not covered under warranty and/or may void the warranty.
PM values can cause out of tolerance measurements. A new RPM4 is delivered with PA and PM values set to zero and 1 for all ranges. This does not mean that the RPM4 has not been calibrated. In the original factory calibration, privileged factory coefficients are used for calibration with the user PA and PM set to zero and 1.
Axxx Q-RPTs) can be viewed by pressing [SPECIAL], <8cal>, <1view>. 5.2.2 EQUIPMENT REQUIRED The recommended calibration standards for RPM4 Q-RPTs are DHI PG7000 piston gauges (PG7102, PG7202, PG7601 for gas; PG7302 for oil). Contact DHI for additional information. 5.2.2.1...
SET-UP AND PREPARATION To set-up and prepare an RPM4 for calibration of a Q-RPT: Set the RPM4 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.
Standard or Premium Class (see Section 1.2.2.1). The class of the RPM4 Q-RPTs is indicated in the model number on the product label and on the rear panel Q-RPT label (<s> for standard, <p> for premium, for example A7Ms or A7Mp).
<1no> causes absolute and negative gauge modes to be unavailable for the Q-RPT. 5.2.6 Q-RPT CALIBRATION USING CALTOOL FOR RPTS SOFTWARE To calibrate RPM4 Q-RPTs using CalTool software, refer to Sections 5.2.1, PRINCIPLE, 5.2.2, and 5.2.3 in this manual and then refer to the CalTool for RPTs Software Manual. CalTool...
Page 133
(see Section 3.5.5.5). A new RPM4 is delivered with PA and PM values set to zero and 1 for all ranges. This does not mean that the RPM4 has not been calibrated. In the original factory calibration, privileged factory coefficients are used for calibration with the user PA and PM set to zero and 1.
Q-RPT CALIBRATION/ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE PRINCIPLE The RPM4 Q-RPTs can be calibrated and adjustments made without using CalTool for RPTs software. This requires: • Applying pressures with a calibration standard and recording the pressures measured by RPM4.
ADJUSTMENT OF ON-BOARD BAROMETER PURPOSE To adjust the output of the on-board barometer (see Section 1.2.2.2). RPM4’s that have only G100K or G200K Q-RPTs (no Axxx or G15K or BGxxx) are NOT equipped with an on-board barometer. PRINCIPLE The on-board barometer output can be adjusted using PA and PM values in the same manner as Q-RPTs (see Section 5.2.1.1).
MEMORY RPM4 uses FLASH memory. This allows the embedded software that controls RPM4 operations and functions to be loaded into RPM4 over its COM1 port from a computer with a simple FLASH loading utility program. To replace corrupted software or upgrade your software, access the DHI worldwide web site at www.dhinstruments.com and go to SOFTWARE.
The micro board supports a Motorola 68302 micro-controller, EPROM, EEPROM, 128k x 16 bit NVRAM, 8 Mbit flash memory; RS-232 and IEEE-488.2 communications; keypad and display control. An I/O port controls other ports and devices in RPM4. 5.5.2 POWER SUPPLY MODULE + 12 V DC (±...
See Figure 8 for pneumatic schematics of different Q-RPT module configurations. 5.5.5.1 HI Q-RPT MODULE RPM4 is always equipped with a Hi Q-RPT module. The Hi Q-RPT module is in the Hi Q-RPT position. It is always the higher range in two Q-RPT RPM4s. 5.5.5.2 LO Q-RPT MODULE RPM4 may be equipped with a Lo Q-RPT module.
Axxx Q-RPT >A10M (No SDS) Axxx Q-RPT <A10M VALVE STATE CONDITION SDS Open SDS Closed Power off Gxxx or BGxxx Q-RPT VALVE STATE CONDITION SDS Open SDS Closed Power off Figure 8. Pneumatic/hydraulic schematics of RPM4 with Single Q-RPT Module Page 129...
RPM4™ OPERATION AND MAINTENANCE MANUAL The pneumatic schematic for RPM4’s with two Q-RPT modules is the same as for the single Q-RPT modules in Figure 8 with the following exceptions: • If both modules use the barometer, the barometer is connected to teed to both module barometer connection points.
RPM4 operation. This troubleshooting guide is intended as an aid in identifying the reason for RPM4 behavior and determining whether the behavior is due to normal operation or an internal or external problem.
Page 142
RPM4 must have two Q-RPTs of the same type (Axxx, Gxxx, BGxxx) and the current If RPM4 has two Q-RPTs of the same type, Cannot select differential range must be the default range (<DF>) of set the default range of the Hi Q-RPT.
Q-RPT. the RPT, OPEN SDS. 3.2.7, 3.3.8 indication. Familiarize yourself with your RPM4 RPM4 may have two TEST(+) ports and the configuration. Connect pressure to be pressure to be measured is connected to the measured to correct TEST(+) port.
Page 144
RPM4™ OPERATION AND MAINTENANCE MANUAL Page 134...
The RPM4 remote ENTER function operates by detecting the open or closed status of the REMOTE ENTER switch. The normal status of the ENTER switch is OPEN. When RPM4 detects a CLOSED condition held for 300 ms, it is interpreted as equivalent to a press of the [ENT] key.
UNIT CONVERSION 7.2.1 PRESSURE RPM4 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 28 provides the conversion coefficients used by RPM4 to convert numerical values expressed in SI units to corresponding values expressed in other units.
8. WARRANTY LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling.
Page 148
RPM4™ OPERATION AND MAINTENANCE MANUAL Page 138...
Page 149
A DISPLAY function in which the highest and lowest pressure measurements since HiLo reset are recorded and displayed. The designation of a single Q-RPT in an RPM4, or, if there are two, the one that has the Hi Q-RPT highest full scale default range.
Page 150
PPC3. PPC3 automates RPM4 pressure control. The transducer used by RPM4 for low uncertainty pressure measurement. May be designated as Hi, Lo or HL depending on its position and role in t he RPM4. Q-RPT (Quartz Reference...