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PPCH-G™ OPERATION AND MAINTENANCE MANUAL

© 2007 DH Instruments, a Fluke Company

Page 22

In standard dynamic control mode, when conditions are appropriate, a second stage of
pressure control is used to maintain the target pressure value within very narrow hold limits.
The second stage is thermal pressure control (TPC). TPC, uses a pressurized volume
containing a heating element(9). There is a forced air cooling system around the volume.
Heating and cooling the gas in the volume causes it to expand or contract, increasing or
decreasing pressure. This pressure control system allows extremely fine pressure control
without hysteresis or wear of mechanical parts.

The TPC system response is dependent on the pressure and the volume connected to the

TEST

port. It is minimally effective when there are leaks in the test system or the test volume

is large. PPCH-G automatically determines whether conditions are appropriate to use TPC
and runs an automated routine to determine the test volume. This routine is initiated
automatically when needed.

If the PPCH-G includes a second, Lo Q-RPT(13), valves are included to isolate and vent the
Lo Q-RPT when it is not being used. The valves are operated automatically to connect the
Lo Q-RPT when it is selected for use or to isolate it and vent it when it is not being used.

1.

DRIVE

air port

2.  Low pressure filter
3.  Drive air control manifold
4.  Supply pressure accumulator
5.  Outlet vallve, servo-controlled
6.

VENT

port

7. Vent valve, pneumatically controlled
8.

TEST

port

9.

Thermal pressure control unit (TPCU)

10.  High pressure filter(s)
11.  Hi Q-RPT or utility sensor 12.  Inlet valve, servo-controlled
13.  Lo Q-RPT, isolation valve, vent valve, pneumatically controlled
14.  Supply pressure transducer
15.  Supply shut-off valve, pneumatically controlled
16.

SUPPLY

port (high pressure test gas)

Figure 6.

Pressure control system schematic

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Содержание PPCH-G

Страница 1: ...2007 DH Instruments a Fluke Company PPCH G High Gas Pressure Controller Calibrator Operation and Maintenance Manual...

Страница 2: ...als 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 m...

Страница 3: ...3 3 POWER CONNECTION 8 2 3 4 REMOTE ENTER SET P CONNECTION FOOTSWITCH OR OTHER SWITCH 8 2 3 5 CONNECTING DRIVE AIR DRIVE PORT 9 2 3 6 CONNECTING HIGH PRESSURE GAS SUPPLY SUPPLY PORT 9 2 3 7 CONNECTIN...

Страница 4: ...MODE 36 3 3 4 AUTORANGE 37 3 3 5 RPT 39 3 3 6 AUTOTEST 40 3 3 6 1 QUICK AUTOTEST 41 3 3 6 2 QDUT AUTOTEST 44 3 3 7 HEAD 47 3 3 8 PRIME CYCLE 48 3 3 9 LEAK CK 49 3 3 10 ENT SET P SET PRESSURE AUTOMATI...

Страница 5: ...EGISTER 117 4 5 3 STANDARD EVENT REGISTER 119 4 5 4 READY STATUS REGISTER 119 4 6 IEEE STD 488 2 COMMON AND STATUS PROGRAM MESSAGES 120 4 6 1 PROGRAM MESSAGE DESCRIPTIONS 121 5 MAINTENANCE ADJUSTMENTS...

Страница 6: ...PT OR UTILITY SENSOR 139 5 9 2 3 TEST VENT VALVE 139 5 9 2 4 SUPPLY ISOLATION VAVLE 139 5 9 2 5 LO Q RPT ISOLATION VALVE VENT VALVE OPTIONAL 139 5 9 2 6 SUPPLY ACCUMULATOR 139 5 9 2 7 FRONT PANEL 139...

Страница 7: ...10 Reset Sets 76 Table 11 Reset Cal 77 Table 12 Reset All 78 Table 13 Security levels 81 Table 14 UNIT function available units of measure 83 Table 15 COM1 pin designations and connections 87 Table 1...

Страница 8: ...ion 24 Figure 8 Ready Not Ready in dynamic pressure control mode 25 Figure 9 Static pressure control operation 25 Figure 10 Ready Not Ready in static control mode 26 Figure 11 Monotonic pressure contr...

Страница 9: ...tenance and calibration information Section 6 is a quick troubleshooting guide Use it to troubleshoot unexpected PPCH G behavior based on the symptom of that behavior Certain words and expressions hav...

Страница 10: ...PPCH G OPERATION AND MAINTENANCE MANUAL 2007 DH Instruments a Fluke Company Page VIII N NO OT TE ES S...

Страница 11: ...s controlled locally by the operator using a front panel display keypad and function keys or remotely by a computer using ASCII character command strings over an RS232 or IEEE 488 2 interface PPCH G m...

Страница 12: ...1 2 2 PRESSURE MEASUREMENT SPECIFICATIONS 1 2 2 1 QUARTZ REFERENCE PRESSURE TRANSDUCER Q RPT Quartz reference pressure transducers Q RPTs can be installed in PPCH G to obtain high precision and low u...

Страница 13: ...arity hysteresis repeatability 3 Maximum deviation of the Q RPT indication from the true value of applied pressure including precision predicted one year stability limit temperature effect and calibra...

Страница 14: ...measure changes in atmospheric pressure to provide dynamic compensation of the Q RPT s atmospheric pressure offset when operating in gauge measurement mode If calibrated it can also be used as an Aut...

Страница 15: ...ncludes all items indicated in Table 2 Table 2 PPCH G packing list DESCRIPTION PART 1 ea PPCH G Pressure Controller Calibrator FAM0011 1 ea PPCH G Enclosure optional 06 01 ACCESSORIES 402255 402255 CE...

Страница 16: ...to which pressure is to be controlled see Section 2 3 7 3 Support facilities required include An electrical power source of 85 to 264 VAC 50 60 Hz A pneumatic power supply of drive air to be connected...

Страница 17: ...e connections Remove the protective plastic sheet from the front panel display Familiarize yourself briefly with the front and rear panel see Section 2 3 2 Then proceed with Sections 2 3 3 to 2 3 9 2...

Страница 18: ...T port Figure 2 Rear panel 2 3 3 POWER CONNECTION Check that the PPCH G power switch is OFF Connect the supplied power cable to the rear panel power input module Connect the other end of the power cab...

Страница 19: ...he supply pressure before reading Sections 2 4 1 and 2 4 3 If a DHI GB H 152 gas booster is being used for the high pressure gas supply interconnections to connect the booster output to PPCH G SUPPLY...

Страница 20: ...mmunications and other RPM4 functions to integrate the RPM4 measurement capabilities into the PPCH G system The user is responsible for setting up hardware and following procedures to isolate lower pr...

Страница 21: ...external RPM4 the RPM4 COM port settings must be Baud rate between 1200 and 19200 Parity Even Data bits 7 Stop bits 1 If PPCH G is not able to establish communications with an RPM4 and its Q RPTs chec...

Страница 22: ...and Maintenance Manual for information on operating the PG7202 with an automated pressure controlling device For PPCH G to be identified by a PG7202 platform the PPCH G COM1 port settings must be the...

Страница 23: ...rtup determine the security level that is appropriate for the PPCH G and set a password if desired PPCH G is delivered with the security level set to low to avoid inadvertent altering of critical inte...

Страница 24: ...REMENT Check that the PPCH G operates properly in absolute mode If the PPCH G is not vented VENT LED ON press the VENT direct pressure control key see Section 3 1 3 Use the RANGE function key to chang...

Страница 25: ...CONTROL mode to handle higher test system leak rates increase the hold limit using CUSTOM CONTROL see Section 3 4 6 1 or use HI VOLUME DYNAMIC CONTROL see Section 3 2 2 2 Use LEAK CHECK to perform a...

Страница 26: ...ive air pressure supply to the DRIVE port 2 5 2 LONG TERM STORAGE The following procedure is recommended for long term storage of PPCH G Complete the short term storage procedure see Section 2 5 1 Plu...

Страница 27: ...e communication 3 1 1 MAIN RUN SCREEN The PPCH G 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 very top level of all m...

Страница 28: ...blank fluid head is zero 3 3 7 5 z AutoZero indicator Indicates whether the AutoZero function is ON or OFF z AutoZ is ON blank AutoZ is OFF 3 5 1 6 RRH Active Q RPT position indicator Indicates the po...

Страница 29: ...ies 3 The Menu Data keys provide access to function menus when pressed 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...

Страница 30: ...ther direct pressure control key is pressed or an automated pressure control command is given Removing electrical power also closes the vent valve Pressing the and direct pressure control keys aborts...

Страница 31: ...IPLES 3 2 1 PRESSURE CONTROL PRINCIPLES Numerical references in this section refer to Figure 6 PPCH G is designed to precisely measure and control gas pressure into a volume connected to its TEST port...

Страница 32: ...st volume is large PPCH G automatically determines whether conditions are appropriate to use TPC and runs an automated routine to determine the test volume This routine is initiated automatically when...

Страница 33: ...of hold limit see Section 3 2 2 3 Monotonic control Near a target pressure value set a low rate pressure ramp continuing in the same direction as that in which the pressure was set Always controls pr...

Страница 34: ...be necessary when the test volume connected to the PPCH G is greater than 100 cc and or if there are excessive leaks in the system into which pressure is being conrolled The difference between standa...

Страница 35: ...with which the pressure control system can actively control pressure Using static control to control pressure near the desired set point and then measuring back the stabilized pressure without interf...

Страница 36: ...he PPCH G and output from the device under test during the slow ramp near the target pressure Monotonic mode is also used to float the piston of a piston gauge when PPCH G is used as the automated pre...

Страница 37: ...de Figure 12 Ready Not Ready in monotonic pressure control mode 3 2 2 5 RAMP CONTROL Ramp control is designed to set a pressure ramp at a target rate and maintain the rate within a rate hold limit see...

Страница 38: ...rate hold limit Figure 14 illustrates Ready Not Ready operation in ramp control mode Note Target is a rate of change value pressure time not a pressure value Figure 14 Ready Not Ready in ramp pressure...

Страница 39: ...ions 3 2 2 2 3 2 2 3 3 2 2 4 3 2 2 5 Pressure Ready Not Ready parameters are set by default when AutoRange is used or a control mode is selected see Table 8 The parameters can be customized if desired...

Страница 40: ...measurement devices with a PPCH G the user is responsible to setting up hardware and following procedures to protect lower range Q RPTs from overpressure Only the Lo Q RPT IL built into the PPCH G is...

Страница 41: ...all their settings for reactivation later see Section 3 4 1 A PPCH G 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...

Страница 42: ...mponent for automatically setting pressure and floating the piston of a PG7202 gas operated piston gauge For automated operation the PPCH G communicates with the PG7202 through an RS232 connection fro...

Страница 43: ...mmonly used setup features including save delete AutoRange ranges set display resolution adjust jog step size set upper lower limit view AutoTest data select pressure control mode and adjust control l...

Страница 44: ...h it PPCH G displays Cannot find range s external Q RPT Xn where Xn is the Q RPT position designator Use ENT or ESC to return to the range selection screen For information on setting up and communicat...

Страница 45: ...ure units of measure as well as user defined units To simplify operation quick access to six unit choices is made available under the UNIT key The default units available depend on whether the PPCH G...

Страница 46: ...n on selecting the unit of measure see Section 3 3 2 PRINCIPLE PPCH G supports simple one step switching between two measurement modes Absolute Measures pressure relative to vacuum zero is hard vacuum...

Страница 47: ...settings made by AutoRange are summarized in Table 7 A range set up using AutoRange and all its range specific settings may be saved for later recall using SETUP 1range see Section 3 4 1 Saved ranges...

Страница 48: ...ale pressure can be covered by an available Q RPT AutoRange proceeds to the range display View proposed AutoRange range The proposed AutoRange range screen is 1 Indication that this is a screen of the...

Страница 49: ...PPCH G pressure controller calibrator system two internal and two external see Section 3 2 5 PPCH G communicates with external Q RPTs by RS232 over its COM2 port To be available for use by the PPCH G...

Страница 50: ...fully identify and initialize an external RPM4 the RPM4 COM1 port settings must be Baud rate between 1200 and 19200 Parity Even Date bits 7 Stop bits 1 If PPCH G is not able to establish communication...

Страница 51: ...a cardinal target pressure point This is particularly useful when calibrating analog gauges Test sequences are defined by the minimum pressure maximum pressure and test increment in of full scale For...

Страница 52: ...er the test lowest pressure point and press ENT The display is 1 Entry field for sequence pressure increment in of full scale Recalls last value entered Test increment 20 0 FS This selection determine...

Страница 53: ...own time remaining once Ready condition has been reached at target value 8 232 MPa g IH T 10 000 D 2 11 Except for the bottom right hand corner the sequence run display is identical to the normal MAIN...

Страница 54: ...selection of the pressure control mode in which the test is to be run see Section 3 4 6 Control 1dynamic 2static 3monotonic Select the pressure control mode that is to be used by the PPCH G when runn...

Страница 55: ...Range range Enter the DUT tolerance and press ENT The display is 1 Entry field for sequence pressure increment in of full scale Recalls last value entered Test increment 20 0 FS This selection determi...

Страница 56: ...PPCH G based on DUT characteristics without running a specific test sequence Pressing ENT causes sequence execution to proceed The display is 0 000 psi g IH Prep ENTER 0 11 Perform any operations that...

Страница 57: ...reference pressure transducer in order to predict the pressure at a height other than the PPCH G s reference level PRINCIPLE PPCH G is calibrated at the reference level marked on the instrument rear p...

Страница 58: ...same as ranges are changed Edits made to the head settings are independent of active range or Q RPT When a head correction is being applied it is indicated by h in the top line of the MAIN RUN screen...

Страница 59: ...mine the leak rate of the system connected to the PPCH G TEST port PRINCIPLE Leaks in the system connected to PPCH G s TEST port can cause differences between the pressure measured by the PPCH G Q RPT...

Страница 60: ...e the leak test is running restarts the leak check timer When the leak check timer countdown has completed PPCH G beeps three times and the leak check results screen is displayed 1 Total pressure chan...

Страница 61: ...peration of ENT Set P depends on the active pressure control mode Dynamic mode See Section 3 3 10 1 Static mode See Section 3 3 10 2 Monotonic mode See Section 3 3 10 3 Ramp mode See Section 3 3 10 4...

Страница 62: ...hen automated pressure control is active Character is D for standard or d for hi volume dynamic control C is appended if custom control parameters are in use 3 Target pressure value T when controlling...

Страница 63: ...n on zero target value Press ENT SET P to start pressure control to the target pressure and return to the MAIN RUN screen The MAIN RUN screen when pressure control is active is 1 Standard MAIN RUN scr...

Страница 64: ...MAIN RUN screen first line showing measured pressure and active Q RPT 2 Edit field for the pressure control target pressure in current pressure unit of measure 20 007 MPa g HI Target 40 0 Edit the tar...

Страница 65: ...en first line showing measured pressure and active Q RPT 2 Edit field for the target ramp rate in current pressure unit of measure per second 20 007 MPa g HI Target rate 0 1000 s Edit the target ramp...

Страница 66: ...control is interrupted by Pressing ESC Suspends control and remains in MAIN RUN screen Does not vent pressure PPCH G passively measures the pressure applied to its TEST port Pressure may take some ti...

Страница 67: ...TION To access the SETUP menu press SETUP from the MAIN RUN screen The display is 1range 2res 3jog 4UL 5ATest 6control 7drv SETUP menu choices include 1range Save and delete ranges created by AutoRang...

Страница 68: ...s a range that has already been saved 3 4 1 2 DELETING AUTORANGE RANGES OPERATION To delete a single saved AutoRange range press SETUP 1range 2delete If there are any saved ranges available to delete...

Страница 69: ...ution setting active or ESC to make no changes The resolution setting is range specific A resolution setting made in one range does NOT affect other ranges The maximum resolution setting is limited in...

Страница 70: ...tomated pressure control targets greater than the upper limit are not accepted When the pressure measured by PPCH G exceeds the upper limit automated or direct manual pressure control is aborted and a...

Страница 71: ...over pressure function causes all pressure control to be interrupted changes the active range to the default range of the Internal Hi IH Q RPT or utility sensor and causes the measured pressure displa...

Страница 72: ...QDUT AutoTest data files available PPCH G stores up to ten data files in order of execution with a new data file pushing all the files back and deleting the oldest one When the header of the data file...

Страница 73: ...fault pressure control parameters HOLD LIMIT PRESSURE STABILITY LIMIT PRESSURE TARGET LIMIT RATE LIMIT DYNAMIC MODE standard and hi volume 0 01 of active range or 0 003 of Q RPT maximum span whichever...

Страница 74: ...ange and control mode select the control mode using SETUP 6control 2mode Custom control parameters are range specific Changes made in one range are stored for that range and are recalled when that ran...

Страница 75: ...Active control mode M for monotonic Target limit IH 1 000 MPa M Edit the target limit value if desired and press ENT to view the monotonic ramp rate limit The next display is 1 Active Q RPT designator...

Страница 76: ...ntrol mode selection activates the control mode sets default control parameters for that control mode For best results wait 5 minutes with the PPCH G vented before controlling pressure when changing t...

Страница 77: ...ses a menu of PPCH G settings adjustment and features that are less commonly used or not normally used in regular operation OPERATION Press SPECIAL from the MAIN RUN screen to access the SPECIAL menu...

Страница 78: ...zero atmospheric pressure which is supplied by definition when the Q RPT is vented to atmosphere 2 Pu 0 The pressure reading of the Q RPT with no AutoZ offset at the time AutoZ is performed 3 Poffset...

Страница 79: ...also applied to compensate for changes in atmospheric pressure between AutoZ updates see Section 3 2 4 The measured gauge pressure is calculated using Patm to correct the value of Poffset G Pgauge Pu...

Страница 80: ...absolute measurement mode Take care to properly consider fluid heads on the Q RPTs and the AutoZ reference OPERATION The AutoZ function and values are Q RPT AND measurement mode absolute gauge specifi...

Страница 81: ...he run AutoZ function seen Section 3 5 1 2 in absolute measurement mode or automatically in gauge modes Before editing Poffset see Section 3 5 1 PRINCIPLE To edit the current Poffset value for the act...

Страница 82: ...ENT to activate the new value of Poffset or ESC to start over with entry of a new AutoZ reference Pstd 0 value Old Poffset 0 0 Pa New Poffset 675 Pa While the value of Pstd 0 is entered in the curren...

Страница 83: ...communications formats classic and enhanced Which of these is active can be selected A self test is supplied for RS 232 communications The self test allows verification that the PPCH G RS232 ports COM...

Страница 84: ...4 3 SPECIAL 2remote 4format allows the remote program command syntax to be selected The cursor is on the active format Select 1classic to activate the classic command format or 2enhanced for the enhan...

Страница 85: ...r 2liqud depending on the pressurized medium between the PPCH G and the height at which pressure is to be calculated Select the gas or liquid species The liquid selection 3User is to create a custom l...

Страница 86: ...sets are itemized in Table 10 Table 10 Reset Sets RESET RESULT SEE SECTION UNIT Returns pressure unit of measure to first of six available 3 3 2 MODE Returns measurement mode to absolute unless absolu...

Страница 87: ...Q RPT user calibration coefficients PA to zero PM to 1 5 2 1 1 5 2 7 Q RPT absolute mode ON 5 2 5 Utility Sensor calibration coefficients PA to zero PM to 1 5 4 On board barometer calibration coeffici...

Страница 88: ...iew and change the keypress sounds see Section 3 5 5 2 3time View and edit the internal time and date settings see Section 3 5 5 3 4ID View the RPM3 serial number SN and view or edit the ID number see...

Страница 89: ...nd edit the PPCH G internal time and date settings OPERATION To access the TIME function press SPECIAL 5pref 3time The display is Edit 1time 2date 08 32 11 am 20020925 Select 1time to edit the time Ed...

Страница 90: ...ons 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 re...

Страница 91: ...nctions accessed by the key strokes marked by Table 13 Security levels FUNCTION LOW MEDIUM HIGH RANGE UNIT MODE AutoRange RPT AutoTest 2QDUT AutoTest 1Quick Run current Quick ATest 2no HEAD PRIME LEAK...

Страница 92: ...is condition with a security level of 2low is the factory default If there is an active password the PPCH G password entry screen appears The user must enter the user defined password or the factory s...

Страница 93: ...e The display becomes Unit 6 1SI 2other 3user 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 The units of mea...

Страница 94: ...section of this manual see Sections 5 5 5 6 3 5 7 2 2BARO PURPOSE To view the value of atmospheric pressure as measured by the PPCH G on board barometer PRINCIPLE PPCH G is equipped with an on board...

Страница 95: ...main run screen and use UNIT see Section 3 3 2 3 5 8 8CAL PURPOSE To calibrate the PPCH G utility sensor Hi and or Lo Q RPTs and adjust the on board barometer This function is considered part of PPCH...

Страница 96: ...PPCH G OPERATION AND MAINTENANCE MANUAL 2007 DH Instruments a Fluke Company Page 86 N NO OT TE ES S...

Страница 97: ...g from remote to local or from local to remote aborts any active generation 4 2 1 RS232 INTERFACE 4 2 1 1 COM1 The PPCH G COM1 RS232 interface is located on the back of the unit It is a 9 pin male DB...

Страница 98: ...mal pin to pin DB 9M to DB 9F RS232 cable to be used to connect to a DCE device Handshaking is not required or supported Table 16 COM2 DB 9F pin designations PIN FUNCTION DESCRIPTION 2 RxD This pin tr...

Страница 99: ...is put into an Error Queue and the ERR query program message can be used to get a text description of the most recent error If you are using the IEEE 488 port the service request line can be setup to...

Страница 100: ...perator CLS Clear the error queue No reply UNIT KPA MMODE A PS 100 Three commands at once No reply ERR Wait for reply User should use ERR query following a series of non query commands to check for er...

Страница 101: ...Hi or Lo RPT calibration information obsolete format PR Read the next PPCH G pressure PRR Read the next PPCH G pressure rate and ATM PS Set a new target pressure and start automated pressure control...

Страница 102: ...mmand suffix ERR 11 Command missing argument ERR 12 System overpressured or overpressure may result ERR 13 Text queue overflow ERR 14 User unit not defined ERR 16 Generation failure ERR 18 Command not...

Страница 103: ...here are multiple arguments then commas must separate them The PPCH G will always reply to a Classic program message You must wait for this reply before issuing another program message If this field i...

Страница 104: ...rectly set up to communicate with the device on COM2 Refer to the COM2 program message If the PPCH G is using an external RPM4 as the active RPT then this command should not be used to interfere with...

Страница 105: ...t range data including the RptLabel used for the range Example enhanced Cmd sent Reply ARANGE read the current range in the current units 1000 0 psi A IH Example classic Cmd sent Reply ARANGE read the...

Страница 106: ...op COM1 Classic COM1 baud parity data stop COM1 Arguments Baud The baud rate This may be 300 600 1200 2400 4800 9600 or 19200 Parity The data parity This may be O for odd E for even or N for none Data...

Страница 107: ...ing or improper program message argument s See Also PASSTHRU 3 5 2 1 4 2 1 3 DATE Purpose Read or set the PPCH G date Command Query DATE date DATE Classic DATE date DATE Arguments date The date in the...

Страница 108: ...ple enhanced Cmd sent Reply DRV2 1 1 Example classic Sent Reply DRV1 1 DRV1 1 Errors ERR 6 The n or x arguments are not within given limits See Also 3 4 7 DS Purpose Decrease the pressure slowly Comma...

Страница 109: ...Oil H2O or User Remarks The PPCH G can make a fluid head correction to allow it to display the pressure at the level of the device under test instead of at the level of the PPCH G Example enhanced Cmd...

Страница 110: ...ion label Command Query ID string ID Classic ID string ID Arguments String An alphanumeric string up to 12 characters long Remarks The user defined ID label can be used to allow the user to tag the PP...

Страница 111: ...ly IS 1 1 no reply if IEEE 488 Example enhanced Cmd sent Reply IS 1 1 Example classic Sent Reply IS 1 IS 1 Errors ERR 6 The n argument is a 0 or a 1 See Also IF DF DS IP DP 3 2 1 L2 L3 Purpose Read or...

Страница 112: ...tandard dynamic control 1 1 for hi volume dynamic control 2 for monotonic control 3 for rate control Remarks The method which the PPCH G controls pressure is selected with the MODE program message Whe...

Страница 113: ...OM2 port is used for communication with DHI RPM4s used as PPCH G external measurement devices The COM2 port can alternatively be used to communicate to another RS232 device such as another PPCH G This...

Страница 114: ...y be allowed to operate in gauge mode Changes made using this program message take effect immediately The calibration information of DHI RPM4s connected to PPCH G must be adjusted directly on the RPM4...

Страница 115: ...xecuted omitting the automated control configuration routine Command PS n v Classic PS n v Arguments n v The target pressure in the current pressure units The volume of the system connected to the PPC...

Страница 116: ...t of range Active external RPM4 timeout Pressure has exceeded maximum limits See Also PR PRR STAT SR PSS PS 3 2 1 PSS Purpose Set a new target pressure using a slow fixed rate and aborting pressure co...

Страница 117: ...so PR PRR SR 3 1 1 3 5 7 2 RANGE Purpose Change the active range to one of the available internal or external default Q RPT ranges Read the active range full scale pressure unit and measurement mode C...

Страница 118: ...since the ready check flag was set Example enhanced Cmd sent Reply READYCK 1 1 no reply if GPIB 488 Example enhanced Cmd sent Reply READYCK 1 Example enhanced Cmd sent Reply READYCK 1 if PPCH G condi...

Страница 119: ...ettings are not affected The remote RESET program message corresponds to the front panel Reset Sets The reset cycle takes up to 3 seconds to complete Remote communications should not take place during...

Страница 120: ...the communications settings for the PPCH G s COM2 port and the external RPM4 devices should be setup prior to this If you are querying the unit for information about a particular RPT Using the prefix...

Страница 121: ...e the test volume is constant and the configuration does not change This argument is only an approximation value and it may be adjusted empirically for correct operation A higher v setting speeds up t...

Страница 122: ...le range of the RPT range These limits are part of the ready criteria The stability limit applies to static and dynamic control modes only The rate limit applied to monotonic control mode only If this...

Страница 123: ...ent Reply SUPPLYPR 107 7 MPa Example classic Query sent Reply SUPPLYPR 107 7 MPa See Also 3 5 7 3 3 2 1 TIME Purpose Read or set the PPCH G internal clock Command Query TIME hh mmXX TIME Classic TIME...

Страница 124: ...sic Sent Reply TPCVOL 50 50 Errors ERR 6 The volume was invalid See Also 5 5 UCOEF Purpose To convert 1 Pascal to the current pressure units Query UCOEF Classic UCOEF Remarks The PPCH G handles all pr...

Страница 125: ...UNIT unita ref UNIT Arguments unit ref The text corresponding to the pressure unit of measure The optional unit reference temperature only if the unit is InWa Remarks This program message determines...

Страница 126: ...reference purposes It indicates the internal RPT s and software version Example enhanced Query sent Reply VER DH INSTRUMENTS INC PPCH G us A100M A20M Ver1 00 US version Example classic Query sent Repl...

Страница 127: ...is used to track and report system status and errors It follows the model of the IEEE Std 488 2 and works for the COM1 and the IEEE 488 port with slight differences The PPCH G can be programmed to re...

Страница 128: ...20 14 hex an SRQ will occur if the MAV or the ERROR bit are set The description of these bits are given as OPER N A Bit 7 128 RQS Requested Service Bit 6 64 Indicates that the SRQ line of the IEEE 48...

Страница 129: ...e ESC key CMD Command Error Bit 5 Indicates that a remote command error has occurred A command error is typically a syntax error in the use of a correct program message EXE Execution Error Bit 4 Indic...

Страница 130: ...on 3 2 2 4 6 IEEE STD 488 2 COMMON AND STATUS PROGRAM MESSAGES The PPCH G supports a set of commands that are common to all instruments conforming to IEEE Std 488 2 These command make it easy to perfo...

Страница 131: ...SR Remarks The Standard Event Register contents are cleared after reading The reply is in decimal numeric form Example enhanced Sent Reply ESR 20 the QYE and EXE bits are set IDN Purpose Identify the...

Страница 132: ...bit 6 Example enhanced Sent Reply STB 80 The MSS and MAV bits are set TST Purpose Read the power on self test status Query TST Remarks The PPCH G system memory stores the user settings units resoluti...

Страница 133: ...cific situations use the troubleshooting guide in Section 6 PPCH G is covered by a limited one 1 year warranty Unauthorized service or repair during the warranty period is undertaken at the owner s ri...

Страница 134: ...PPCH G may also use external Q RPTs mounted in RPM4 Reference Pressure Monitors RPM4 Q RPTs are calibrated independently of PPCH G see the RPM4 Operation and Maintenance Manual 5 2 1 1 PA AND PM COEF...

Страница 135: ...PA and PM set to zero and 1 It is recommended that as received values of PA PM and Poffset Poffset for absolute mode calibrations if AutoZero is used in normal operation be recorded for each range pr...

Страница 136: ...T see Section 3 1 3 Use SETUP 6control 1mode to set a pressure control mode other than PG see Section 3 4 6 2 The control character in the middle of the bottom line of the display must be other than P...

Страница 137: ...ce that applies gauge pressures Calibration with an absolute reference is not necessary However if a PPCH G Q RPT is calibrated in gauge mode it is not possible to know if it is in or out of tolerance...

Страница 138: ...field is normally used to record the date on which the Q RPT is calibrated The value of absolute mode AutoZero Poffset See Section 3 5 1 for complete AutoZero information This value is normally set t...

Страница 139: ...f PA 2 Position designator of the Q RPT being viewed 3 Value of PM PA 0 0 Pa IH PM 1 000000 If in edit mode the calibration fields can be edited Pressing ENT in the PM field goes to the next calibrati...

Страница 140: ...2 Use MODE to set the desired pressure measurement mode see Section 3 3 3 PPCH G Q RPTs that will be used in gauge measurement mode only may be calibrated in gauge measurement mode with a gauge pressu...

Страница 141: ...Section 3 2 4 PPCH G measurement uncertainty does not depend on the measurement uncertainty of the on board barometer unless it is used as a source of Pstd 0 for AutoZ in absolute measurement mode se...

Страница 142: ...5 to 2 5 minute routine to determine the test volume The volume determination routine can also be initiated by the operator using SPECIAL 7Internal 1config 1TPC 1run The operator initiated volume det...

Страница 143: ...sure under 1 MPa 150 psi 5 6 VALVE OPENING POINT CONFIGURATION PURPOSE To run an automated routine that updates the opening point tables of PPCH G s servo control valves Poor pressure control is usual...

Страница 144: ...iguration is no longer valid Select 1run to cause the VALVE CONFIG routine to execute This display is This display warns the user that pressure will increase to roughly 95 of the PPCH G maximum range...

Страница 145: ...ction 5 2 5 8 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY PPCH G uses FLASH memory This allows the embedded software that controls PPCH G operations and functions to be loaded into PPCH G over its C...

Страница 146: ...unit see Section 5 9 1 The mechanical module see Section 5 9 2 is beneath the electronic module 5 9 1 ELECTRONIC MODULE 1 Power entry and fuse 2a 12V power supply 2b 5 V 15V power supply 3 Driver boar...

Страница 147: ...5 9 1 5 Supply pressure transducer power and output see Section 5 9 2 1 Utility sensor if present power and output see Section 5 9 2 2 Power to the electrical system cooling fan Power to thermal press...

Страница 148: ...ve servo controlled 11 Thermal pressure control unit TPCU Figure 17 Mechanical module internal view 5 9 2 1 SUPPLY PRESSURE TRANSDUCER The supply pressure transducer is a 4 to 20 mA output strain gaug...

Страница 149: ...lleville washers It is opened by an opposing force applied by pneumatic pressure on a bladder The test vent valve fully opens the TEST port to atmospheric pressure 5 9 2 4 SUPPLY ISOLATION VAVLE Open...

Страница 150: ...ntrol the flow of supply gas to the TEST port 5 9 2 10 OUTLET CONTROL VALVE Highly progressive needle valve The valve is operated by a stepping motor and drive belt Used to precisely control the exhau...

Страница 151: ...nt including the numbers displayed when ENT is pressed and report to your DHI Authorized Service Provider Cycle power to clear Table 28 Front panel keys seem to be disabled remote command has been sen...

Страница 152: ...r the Ready condition is not maintained long enough System connected to PPCH G TEST port has leaks or has a volume that is too large Correct leaks to extent possible Try using hi volume dynamic pressu...

Страница 153: ...T or utility sensor Reference transducer destroyed by overpressure Contact DHI Authorized Service Provider Table 28 Apparent inaccurate pressure control measure when using Internal Hi IH RPT The IH tr...

Страница 154: ...PPCH G OPERATION AND MAINTENANCE MANUAL 2007 DH Instruments a Fluke Company Page 144 N NO OT TE ES S...

Страница 155: ...t of all the activated drivers cannot exceed one Amp Therefore refer to Table 25 if multiple drivers are being activated simultaneously Table 25 External drivers current output OF ACTIVE DRIVERS MAX C...

Страница 156: ...450377 E 04 psf pound per square foot 1 007206 E 06 inWa 4 C inch of water 4 014649 E 03 inWa 20 C inch of water 4 021732 E 03 inWa 60 F inch of water 4 018429 E 03 inHg 0 C inch of mercury 2 953 E 0...

Страница 157: ...such indirect damage includes but is not limited to loss of production profits revenue or goodwill even if DH Instruments has been advised of the possibility thereof and regardless of whether such pro...

Страница 158: ...PPCH G OPERATION AND MAINTENANCE MANUAL 2007 DH Instruments a Fluke Company Page 148 N NO OT TE ES S...

Страница 159: ...in which the pressure is constantly adjusted to remain as close as possible to the target value External device or External Q RPT A Q RPT in an RPM4 external to PPCH G used by PPCH G for precise press...

Страница 160: ...second The stability limit is used as the Ready Not Ready criterion Ready if rate of change is less than stability limit Not Ready if rate of change is greater than stability limit Static Control Con...

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