DH Instruments PPC2 PLUS Manual

Pressure controller/calibrator

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Page 2 PPC2+™ Operation and Maintenance Manual Â Â © 1998 - 2001 DH Instruments, Inc. All rights reserved. Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, Inc.
Page 3: Table Of Contents
PPC2+™ Operation and Maintenance Manual TABLE OF CONTENTS ................i TABLES ....................iv FIGURES ....................v ABOUT THIS MANUAL ................vi 1. INTRODUCTION ..................1 PRODUCT OVERVIEW..........................1 SPECIFICATIONS............................. 2 1.2.1 GENERAL SPECIFICATIONS ........................2 1.2.2 PRESSURE MEASUREMENT SPECIFICATIONS ..................2 1.2.2.1 REFERENCE PRESSURE TRANSDUCER (RPT) SPECIFICATIONS ..........
Page 4 PPC2+™ Operation and Maintenance Manual 3.1.2.5 MULTIPLE PRESSURE RANGES ....................24 DIRECT FUNCTION KEYS ........................25 3.2.1 RANGE ................................ 25 3.2.1.1 RANGE SPECIFIC FUNCTIONS AND SETTINGS ..............27 3.2.2 UNIT................................27 3.2.3 CONTROL..............................29 3.2.3.1 SYSTEM DEFAULT CONTROL PARAMETERS................30 3.2.3.2 EXECUTING AUTOMATED PRESSURE CONTROL COMMANDS..........
Page 5 PPC2+™ Operation and Maintenance Manual 4.4.3 PROGRAM MESSAGE DESCRIPTION OVERVIEW................... 84 4.4.4 PROGRAM MESSAGE DESCRIPTIONS ....................85 STATUS REPORTING SYSTEM ......................116 4.5.1 ERROR QUEUE............................116 4.5.2 STATUS BYTE REGISTER ........................117 4.5.3 STANDARD EVENT REGISTER ....................... 119 4.5.4 READY STATUS REGISTER........................120 IEEE STD.
Page 6 PPC2+™ Operation and Maintenance Manual Table 1. Reference Pressure Transducer (RPT) Designations and Ranges ...........3 Table 2. Default Pressure Control Parameters ..................4 Table 3. Analog Input Specifications ......................5 Table 4. PPC2+ Packing List ........................7 Table 5. PPC2+ Range Identification Summary..................25 Table 6.
Page 7 PPC2+™ Operation and Maintenance Manual Figure 1. Front Panel..........................9 Figure 2. Rear Panel Assembly.......................10 Figure 3. Keypad Layout .........................18 Figure 4. Direct Pressure Control Keys....................19 Figure 5. Static Pressure Control Operation ...................21 Figure 6. Dynamic Pressure Control Operation ..................22 Figure 7. Ready (<*>)/Not Ready (<...
Page 8 PPC2+™ Operation and Maintenance Manual Manual Conventions This manual is intended to provide the user with the basic information necessary to operate a PPC2+ pressure controller/calibrator. It also includes a great deal of additional information provided to allow you to optimize its 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: Sections 1, 2 and 3 should be read by all first time PPC2+ users.
Page 9: Introduction
PPC2+™ Operation and Maintenance Manual 1.1 PRODUCT OVERVIEW PPC2+ is a stand-alone, microprocessor driven, pressure controller/calibrator intended to apply and measure accurate values of gas pressure for the calibration and testing of pressure measuring instruments. It has been designed to provide very high performance combined with maximum versatility and ease of use.
Page 10: Specifications
PPC2+™ Operation and Maintenance Manual 1.2 SPECIFICATIONS 1.2.1 GENERAL SPECIFICATIONS Power Requirements: 85 to 264 VAC, 50/60 Hz, 30 VA max consumption Operating Temperature Range: 15 to 35 °C Storage Temperature Range: -20 to 70 °C Vibration: Meets MIL-T-28800D Weight: 12.8 kg (28.2 lb) Dimensions: 7.1 in.
Page 11: Reference Pressure Transducer (Rpt) Specifications
PPC2+™ Operation and Maintenance Manual Table 1. Reference Pressure Transducer (RPT) Designations and Ranges 1.2.2.1 REFERENCE PRESSURE TRANSDUCER (RPT) SPECIFICATIONS Â Â Warm Up Time: None required Resolution: To 1 ppm, user settable by individual range Temperature Effect: Fully compensated with active independent temperature measurement from -20 to 100 °C ±...
Page 12: On-Board Barometer
PPC2+™ Operation and Maintenance Manual 1.2.2.2 ON-BOARD BAROMETER The barometric sensor is NOT used as a source of absolute accuracy. It is used ONLY to measure changes in atmospheric pressure to provide dynamic compensation of the RPTs atmospheric pressure offset when using an absolute RPT to make gauge pressure measurements.
Page 13: Analog Input Specification
PPC2+™ Operation and Maintenance Manual Â Control Precision ± 0.001 % (with 30:1 maximum ratio between highest and lowest range) Lo (max range < 300 psi): 100 to 1 000 cc (500 cc optimal) Normal Test Volume: Hi (max range ˜ 300 psi): 0 to 500 cc (250 cc optimal) Slew Rate (0 to Controller FS) Control Speed: in Optimal Volume with No Control: 10 to 30 seconds...
Page 15: Installation
PPC2+™ Operation and Maintenance Manual 2.1 UNPACKING AND INSPECTION 2.1.1 REMOVING FROM PACKAGING PPC2+ is delivered in a custom corrugated container with high density 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 PPC2+ and SPLT (if included).
Page 16: Site Requirements
PPC2+™ Operation and Maintenance Manual 2.2 SITE REQUIREMENTS The PPC2+ can be installed on any flat, stable surface at a convenient height. The front feet can be extended so that the unit can be inclined slightly for easier viewing. The PPC2+ can also be mounted in a standard 19-in.
Page 17: Front And Rear Panels
PPC2+™ Operation and Maintenance Manual 2.3.2 FRONT AND REAR PANELS 2.3.2.1 FRONT PANEL The front panel assembly provides a 2 x 20 vacuum fluorescent display of PPC2+ operating status and a membrane keypad for local user control. Multi-Function Keypad Remote Indicator Direct Pressure Control Keys Display Figure 1.
Page 18: Rear Panel Assembly
PPC2+™ Operation and Maintenance Manual 2.3.2.2 REAR PANEL ASSEMBLY The rear panel assembly provides pressure connections, communications interfaces, the power ON/OFF module and product labeling. Pressure fittings are internally secured to prevent loosening when making and breaking connections. Label, Product Fuse Pressure Connection, SUPPLY 10.
Page 19: Connecting To A Pressure Supply (Supply Port)
PPC2+™ Operation and Maintenance Manual 2.3.4 CONNECTING TO A PRESSURE SUPPLY (SUPPLY PORT) Using a pressure connecting hose of appropriate pressure rating, connect the pressure supply to the SUPPLY connection on the rear panel of PPC2+. The PPC2+ SUPPLY connection is 1/8 in.
Page 20: Installing The Splt
PPC2+™ Operation and Maintenance Manual Â Â Â Â Â Â Â Â Â Â Â Â Â 2.3.6.1 INSTALLING THE SPLT The SPLT (optional) is intended to collect and exhaust liquid that may be present in the device or system under test so that they do not return to contaminate the PPC2+. The SPLT is installed in the test connection line at a low point between PPC2+ and the device or system under test.
Page 21: The Vent Connection (Vent Port)
PPC2+™ Operation and Maintenance Manual 2.3.7 THE VENT CONNECTION (VENT PORT) The PPC2+ VENT connection is the system vent to atmosphere point used to set zero gauge pressure as well as to obtain reference pressure transducer measurements of atmospheric pressure. Though a pressure hose can be connected to the VENT connection to direct the vented gas flow, a completely unobstructed connection to atmosphere must be maintained for PPC2+ reference pressure measurements to operate normally.
Page 22: Check Proper Pressure Measurement Operation
PPC2+™ Operation and Maintenance Manual 2.4.2 CHECK PROPER PRESSURE MEASUREMENT OPERATION 2.4.2.1 CHECKING ABSOLUTE MODE PRESSURE MEASUREMENT If the PPC2+ has an absolute RPT (designated AXXXX), check that it operates properly in absolute mode. If the PPC2+ is not vented (vent LED OFF), press the [VENT] direct pressure control key to vent the PPC2+ (VENT LED ON) (see Section 3.1.2.2).
Page 23: Purge
PPC2+™ Operation and Maintenance Manual 2.4.4 PURGE If the SPLT is included and installed in the test line, perform a purge of the Device Under Test (DUT). This will rid the DUT of contaminated liquids and enable descending pressures to be controlled (see Section 3.2.8).
Page 25: General/Manual Operation
PPC2+™ Operation and Maintenance Manual 3.1 GENERAL/MANUAL OPERATION PPC2+ is designed to offer a 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 display, a 4 x 4 keypad and four direct pressure control keys.
Page 26: General Operating Principles
PPC2+™ Operation and Maintenance Manual 11. Indicates whether the number following is target pressure <T>, rate of change of pressure <R> or current deviation from target value <D>) (see Section 3.2.3). Target pressure <T> is indicated when: Dynamic control is active and pressure is Not Ready (< > or < >) Static control is active and control valves are operating.
Page 27: Direct Pressure Control Keys
PPC2+™ Operation and Maintenance Manual Pressing the [ENTER] key generally causes execution or forward movement in the menu tree. Pressing [ENTER] from the main run screen allows an automated pressure control command to be given. Pressing the [ESCAPE] key moves back in the menu tree and/or causes execution to cease or suspend.
Page 28: Automated Pressure Control
PPC2+™ Operation and Maintenance Manual 3.1.2.3 AUTOMATED PRESSURE CONTROL PPC2+ automated pressure control provides automated adjustment and control of pressure to a user designated target value. This feature allows pressure values to be set simply and precisely by simple numerical entry. Pressing [ENTER] from the main run screen allows a pressure control target value to be entered and executed.
Page 29: Figure 5. Static Pressure Control Operation
PPC2+™ Operation and Maintenance Manual Â P‰†x bu’y”ÂX’y““•’y Tƒ‡ƒ” bƒ‡y Figure 5. Static Pressure Control Operation Dynamic Control Dynamic control mode is designed to set the pressure to the target value and control continuously to keep pressure within the hold limit and as close to the target value as possible.
Page 30: Pressure Ready (<*>)/Not Ready (< > Or < >)
PPC2+™ Operation and Maintenance Manual Â P‰†x bu’y”ÂX’y““•’y Tƒ‡ƒ” bƒ‡y Figure 6. Dynamic Pressure Control Operation 3.1.2.4 PRESSURE READY (<*>)/NOT READY (< > OR < >) The far left character of the main run screen provides a pressure Ready (<*>)/Not Ready (<...
Page 31 PPC2+™ Operation and Maintenance Manual Static Control Ready (<*>)/Not Ready (< > or < >) When static pressure control mode is active a Ready (<*>) condition will occur when: NO control valve is operating. The current measured pressure is inside the hold limit. The rate of change of pressure is less than the current stability limit.
Page 32: Multiple Pressure Ranges
PPC2+™ Operation and Maintenance Manual When NO automated pressure control is active, Ready (<*>) is indicated whenever the rate of change of pressure is less than the current stability limit. 3.1.2.5 MULTIPLE PRESSURE RANGES PPC2+ has one or two reference pressure transducers (RPT) each of which has three ranges for a total of three or six pressure ranges.
Page 33: Direct Function Keys
PPC2+™ Operation and Maintenance Manual Ranges and Identification The currently active reference transducer and range is continuously displayed in the upper right hand corner of the main run screen and most other screens. See Table 1 for a complete listing of the RPTs available and their ranges. Hi RPT: The RPT in a single RPT PPC2+ or the RPT with the highest maximum range in a dual RPT PPC2+ is referred to as the Hi RPT.
Page 34 PPC2+™ Operation and Maintenance Manual m OPERATION Pressing the [RANGE] function key activates the range viewing and selecting function. Pressing the [+/-] key or the [RANGE] key again while in the RANGE functions steps through displays of available ranges: Lo to Hi. Pressing [ENTER] while in the RANGE function when PPC2+ is vented will cause the currently displayed range to become the active range.
Page 35: Range Specific Functions And Settings
PPC2+™ Operation and Maintenance Manual 3.2.1.1 RANGE SPECIFIC FUNCTIONS AND SETTINGS In general, PPC2+ functions and settings are range specific. They are set and stored for each range so that changing them when in one range does not change them in the other ranges.
Page 36 PPC2+™ Operation and Maintenance Manual If <1unit> was selected from the measurement screen, the units screen is presented. The cursor will be on the number corresponding to the active unit for the active range. To change the pressure 4kPa 5mmHg 6kcm2 unit for the active range, select the desired unit.
Page 37: Control
PPC2+™ Operation and Maintenance Manual 3.2.3 CONTROL m PURPOSE To set the automated pressure control mode for the currently active range and activate default control parameters. m PRINCIPLE The CONTROL function allows the active control mode for the current range to be set to either static control or dynamic control (see Section 3.1.2.3).
Page 38: System Default Control Parameters
PPC2+™ Operation and Maintenance Manual 3.2.3.1 SYSTEM DEFAULT CONTROL PARAMETERS Table 6. Lo or Hi Reference Transducer Range 1, 2, 3 HOLD LIMIT STABILITY LIMIT STATIC ± 1 % FS of the active pressure measurement ± 0.005 % FS/sec of the active pressure MODE range measurement range.
Page 39 PPC2+™ Operation and Maintenance Manual Observe the Ready (<*>)/Not Ready (< > or < >) indication for indication of when ready conditions have been satisfied (see Section 3.1.2.4). PPC2+ will continue controlling following static or dynamic control operation protocol (see Section 3.1.2.3) until automated pressure control is interrupted.
Page 40 PPC2+™ Operation and Maintenance Manual Automated Pressure Commands for Zero Pressure Zero in A command for automated pressure control to a target value of gauge zero when in gauge pressure measurement mode is interpreted mode: in the same manner as if the [VENT] direct pressure control key had been pressed (see Section 3.1.2.2).
Page 41: Upper Limit
PPC2+™ Operation and Maintenance Manual 3.2.4 UPPER LIMIT m PURPOSE To set the upper limit pressure value for a pressure range and measurement mode. m PRINCIPLE The UPPER LIMIT function allows the setting of a maximum pressure not to be exceeded when using a specific range and measurement mode.
Page 42: Overpressure Function
PPC2+™ Operation and Maintenance Manual 3.2.4.1 OVERPRESSURE FUNCTION In addition to the UL function, PPC2+ has an overpressure function. This function executes when the maximum RPT range is exceeded by 25 %. The function causes all pressure control to be interrupted and disabled, changes the range to H3 and causes the display to flash.
Page 43 PPC2+™ Operation and Maintenance Manual When <2No> is selected from the Run Current Quick Sequence menu, the set-up/edit routine is accessed. The first display is: Entry field for sequence full scale value. Recalls value last entered. 100 psi a This entry determines the maximum pressure (furthest from zero) of the quick pressure sequence.
Page 44: Setting Up/Editing A File Sequence
PPC2+™ Operation and Maintenance Manual If <2Timer> is selected, a timer will be started each time a pressure Ready (<*>) condition is achieved (see Section 3.1.2.4) and the sequence will continue to the next pressure control target value without operator intervention once the timer has expired. After selecting <2Timer>, an additional screen is presented for entry of the timer value in seconds (minimum 1, maximum 999).
Page 45 PPC2+™ Operation and Maintenance Manual m OPERATION The first display is: Indication of maximum (furthest from zero) pressure included in the sequence which is about to run. 100 psi a This screen is offered as a means for the user to check, prior to execution, that the correct sequence is selected and that it does not exceed the range of the device or system being tested.
Page 46: Custom Control
PPC2+™ Operation and Maintenance Manual Selecting <1Yes> causes the sequence to abort and returns to the main run screen. Selecting <2No> causes the sequence to resume where it left off. Â 3.2.6 CUSTOM CONTROL m PURPOSE To customize the control parameters of the current automated pressure control mode for the current range.
Page 47: Table 7. System Default Control Parameters
PPC2+™ Operation and Maintenance Manual Table 7. System Default Control Parameters Lo REFERENCE TRANSDUCER Hi REFERENCE TRANSDUCER RANGE 1, 2, 3 RANGE 1, 2, 3 HOLD LIMIT STABILITY LIMIT HOLD LIMIT STABILITY LIMIT ± 1 % FS of the active ±...
Page 48: Turning-Off Custom Control Parameters
PPC2+™ Operation and Maintenance Manual 3.2.6.1 TURNING-OFF CUSTOM CONTROL PARAMETERS To return to default pressure control parameters for the active range and control mode, select the control mode using the CONTROL function (see Section 3.2.3). 3.2.7 HEAD m PURPOSE To cause a pressure value representing a difference in height to be added to the pressure measured by the PPC2+ reference pressure transducer.
Page 49: Leak Check/Purge
PPC2+™ Operation and Maintenance Manual m OPERATION To access the HEAD function, press the [HEAD] function key. The display is: Test gas currently specified for the head correction. 95 cm Entry field for head height. 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 50: Leak Check/Purge Menu And Functions Flow Chart
PPC2+™ Operation and Maintenance Manual m PRINCIPLE Leaks in the test system can have a detrimental effect on measurement accuracy and, when large enough, can cause the PPC2+ to be unable to set and control pressures reliably. The LEAK CHECK function is provided as a means of checking and quantifying the leaks that may be present in the system.
Page 51: Leak Check Screen
PPC2+™ Operation and Maintenance Manual MAIN RUN SCREEN LEAK CHECK SCREEN MAIN RUN PURGE SET PRESSURE SCREEN FUNCTION FUNCTION IF PURGE ACTIVE Figure 10. Leak Check/Purge Menu Flow Chart Â 3.2.8.2 LEAK CHECK SCREEN The leak check screen appears when the [PURGE/LEAK CHECK] function key has been pressed from the main run screen.
Page 52: Purge Function
PPC2+™ Operation and Maintenance Manual If the PURGE function is enabled (see Section 3.4.4.8), pressing [VENT] when in the leak check screen causes the PURGE function to execute (see Section 3.2.8.3). Pressing [ENTER] when in the leak check screen goes to the set pressure screen (see Sections 3.2.3.1 and 3.2.8.4).
Page 53 PPC2+™ Operation and Maintenance Manual Pressure control stops and a 5 second wait occurs. SPLT exhaust valve is opened. Wait until pressure is less than 3 psi (20 kPa) gauge or 16 psi (110 kPa) absolute. Vent valve is opened with SPLT exhaust valve left open. When the PURGE function is initiated, if the current pressure is over 100 psi (700 kPa) gauge, the display is: Current measured pressure and pressure units.
Page 54: Setting Pressures For Leak Check/Purge Function
PPC2+™ Operation and Maintenance Manual Once the pressure reaches less than 3 psi (20 kPa) gauge or 16 psi (110 kPa) absolute, PPC2+ opens its internal vent valve and returns to the main run screen in its normal vented condition. Â...
Page 55: Typical Use Of The Leak Check/Purge Function
PPC2+™ Operation and Maintenance Manual 3.2.8.5 TYPICAL USE OF THE LEAK CHECK/PURGE FUNCTION The most common use of the LEAK CHECK/PURGE function is at the beginning of a test just after the device or system under test has been connected to the PPC2+ TEST port.
Page 56: Analog
PPC2+™ Operation and Maintenance Manual 3.2.9 ANALOG m PURPOSE To select the current measurement range of the optional analog input function. This key has no function if the analog input function is not present in the PPC2+. m PRINCIPLE The PPC2+ is available with an analog input option that allows the user to measure up to four external voltage or current sources.
Page 57: Viewing Analog Measurements
PPC2+™ Operation and Maintenance Manual 3.2.9.1 VIEWING ANALOG MEASUREMENTS To view the current reading of the four channels of the optional analog input press the [+/-] key from the main run screen. Channel 2 The display is: -0.001 V 0.001 V Channel 4 Channel 3 The displayed values update about every 0.75 seconds.
Page 58 PPC2+™ Operation and Maintenance Manual m PRINCIPLE The PPC2+ exhaust (down) control valves and the output of the exhaust pressure regulator are connected to the PPC2+ EXHAUST port (see Section 5.8.1.7). The response of the pneumatic module used to control pressure, particularly when controlling pressure near and under atmospheric pressure, changes depending on whether the EXHAUST port is connected to a vacuum source or left open to atmosphere.
Page 59: Resltn
PPC2+™ Operation and Maintenance Manual Selecting <4view> allows viewing of the current EXHAUST port condition assumed by PPC2+ and how it was determined. Â Â Â 3.3.2 Resltn m PURPOSE To set the resolution with which measured pressures are displayed. m OPERATION To access the resolution function, press [SETUP], and select <2Resltn>.
Page 60 PPC2+™ Operation and Maintenance Manual Setting up a sequence file requires specifying: The sequence file number to be created or edited. The RPT to be used (Hi, Lo). The range on the RPT (1, 2 or 3). The pressure units of measure and measurement mode (gauge or absolute). The number of pressure targets in the sequence.
Page 61 PPC2+™ Operation and Maintenance Manual The next display is: Entry field for the file number of the sequence to be edited. Enter the desired sequence file number. Â The next selection determines the RPT that will be used: Indication of the sequence file number that is currently being edited.
Page 62 PPC2+™ Operation and Maintenance Manual Next, the numerical values of the pressure targets in the sequence are specified: Number of the target in the sequence whose value is currently being edited. Entry field for the numerical value of the target pressure.
Page 63: Drivers
PPC2+™ Operation and Maintenance Manual Definition of the file sequence is now complete and the save as choice is offered: Entry field for sequence file address number under which to save this sequence. Enter the desired sequence file number or press [ENTER] if the desired file number is already displayed.
Page 64: Special Menu Key
PPC2+™ Operation and Maintenance Manual 3.4 SPECIAL MENU KEY The [SPECIAL] menu key accesses a menu of functions that are less commonly used or not normally used in regular operation. Press the [SPECIAL] menu key to access the SPECIAL menu. The display is: 4Internal Â...
Page 65 PPC2+™ Operation and Maintenance Manual 2. ZCURERR: The difference between ZSTD and the RPT indication at the autozero pressure at some time after the calibration of the RPT (ZCURERR = RPT w/out AutoZ - ZSTD). 3. ZNATERR: The difference between ZSTD and the RPT indication at the autozero pressure just after the RPT has been calibrated .
Page 66 PPC2+™ Operation and Maintenance Manual Â Recommendations for the Use of the AutoZ Function The AutoZ function provides a powerful and easy to use tool for improving the measurement accuracy specifications of a PPC2+ and reducing the calibration recall interval by compensating for zero drift between full recalibrations. The following simple recommendations will help assure that you use this feature to best advantage.
Page 67: View Autoz
PPC2+™ Operation and Maintenance Manual Selecting <1off> (or <1on>) is for changing the AutoZ status for the current range and measurement mode from ON to OFF or vice versa. Selecting <1off> turns OFF the AutoZ function for the current range and mode (see AutoZ ON/OFF of this section). Â...
Page 68: Edit Autoz
PPC2+™ Operation and Maintenance Manual 3.4.1.2 EDIT AUTOZ Â To edit the current ZOFFSET for the current range and measurement mode, press [SPECIAL] and select <1AutoZ>, <3edit>. The display is: Current measurement mode. Current range. 0.0 Pa Edit field for value of ZOFFSET Â...
Page 69 PPC2+™ Operation and Maintenance Manual If the measurement mode of the current range is absolute the display is: Current range. Current measurement mode. AutoZ H3 abs by: Selection of source of ZSTD for ZOFFSET 1Entry 2COM2 3RngL3 determination. Selecting <1Entry> allows the value of ZSTD to be entered from the front panel keypad.
Page 70 PPC2+™ Operation and Maintenance Manual Run AutoZ by Entry AutoZ by entry allows the value of ZSTD (See Section 3.4.1, PRINCIPLE, How AutoZ Works) to be entered manually. This provides a simple way of autozeroing relative to an independent reference device such as a house barometer that does not interface directly with PPC2+.
Page 71 PPC2+™ Operation and Maintenance Manual Run AutoZ by COM2 AutoZ by COM2 allows the value of ZSTD (see Section 3.4.1, PRINCIPLE, How AutoZ Works) to be read automatically from a DHI RPM1, RPM2 or RPM3 connected by RS-232 interface to the PPC2+ COM2 port. To access run AutoZ by COM2 press [SPECIAL] and select <1AutoZ>, <4run>, <2COM2>.
Page 72: Head
PPC2+™ Operation and Maintenance Manual When, press [ENTER]. The next display is: New ZOFFSET: 13.8 Pa The new ZOFFSET is the ZOFFSET calculated from this execution of run AutoZ. Press [ENTER] to activate the new ZOFFSET and return to the main run screen. Press [ESCAPE] to maintain the old ZOFFSET and return to the main run screen.
Page 73: Presu
PPC2+™ Operation and Maintenance Manual 3.4.3 PresU m PURPOSE To customize the selection of pressure units that will be available for selection from the [UNIT] function key. m PRINCIPLE The [UNIT] function key makes available a choice of six default pressure units (US or SI units depending on whether the PPC2+ has been factory set as US or SI) (see Section 3.2.2).
Page 74: Internal
PPC2+™ Operation and Maintenance Manual If <4user> was selected, the user unit must be defined. The display is: Entry field. 1.0000000 Units/PA Enter the number of user units per Pascal (Pa) in the entry field. Pressing [ENTER] defines the user unit and returns to the Set up unit # screen. Â...
Page 75: Cal
PPC2+™ Operation and Maintenance Manual 3.4.4.2 m PURPOSE To calibrate the PPC2+ Hi and Lo reference pressure transducers and adjust the on-board barometer. This function is considered part of PPC2+ maintenance and is therefore covered in the maintenance section of this manual (see Section 5.2). m PRINCIPLE See Sections 5.2, 5.3, and 5.4.
Page 76: Time
PPC2+™ Operation and Maintenance Manual The user can also specify one or two termination characters as well as define these characters. These are referred to as “Term1” and “Term2”. These define the characters that mark the end of commands that are sent to the PPC2+ as well as mark the end of replies sent back to the host computer.
Page 77: Reset
PPC2+™ Operation and Maintenance Manual 3.4.4.5 RESET m PURPOSE To reset various PPC2+ settings to default or factory values. PPC2+ stores its user definable settings in non-volatile memory. The reset menu allows the user to selectively or completely reset these settings to factory defaults. This clears out any settings that the user has set up, and should be used only to restore the PPC2+ to a known state.
Page 78 PPC2+™ Operation and Maintenance Manual Control Ref to auto (see Section 3.3.1). Screen saver to 10 minutes (see Section 3.4.4.9). Reset - Units m PURPOSE Sets the six pressure units available under the UNIT function to the SI or US default selections depending on whether the PPC2+ has been factory set for SI or US.
Page 79: Level
PPC2+™ Operation and Maintenance Manual Reset - All m PURPOSE Â Â Combines all resets in one global reset command that clears the entire user section of non-volatile memory. These include: Reset - sets (see Section 3.4.4.5.1). Reset - units (see Section 3.4.4.5.2). Reset - seq (see Section 3.4.4.5.3).
Page 80 PPC2+™ Operation and Maintenance Manual Security Levels The security levels are structured to support typical operating environments as follows: None This level is intended for use only by the system manager and/or calibration facility. It allows access and editing in all areas including critical metrological information.
Page 81: Table 9. Security Levels
PPC2+™ Operation and Maintenance Manual The security levels are structured to support typical levels of operation as shown in Table 9. Specifically, the security levels prevent execution of the X’d functions: Table 9. Security Levels FUNCTION MEDIUM HIGH [RANGE] key [UNIT] key [CONTROL] key [UPPER LIMIT] key...
Page 82: Atm
PPC2+™ Operation and Maintenance Manual The second selection <edit password> displays the user password and allows it 2edit password to be edited. Passwords can be up to six numbers in length and cannot start with a zero. Â If <0> is entered, then the password is made inactive and the user will not be required to enter a password to access the user level menu.
Page 83: Purge
PPC2+™ Operation and Maintenance Manual Â Â m OPERATION To view the current reading of the on-board barometer press [SPECIAL] and select <4Internal>, <7Atm>. The display is in the pressure units of the current PPC2+ range. 3.4.4.8 PURGE m PURPOSE To enable and disable the purge function which makes automated use of the optional SPLT (see Section 3.2.8.3).
Page 85: Remote Operation
PPC2+™ Operation and Maintenance Manual 4.1 OVERVIEW Most of the PPC2+ front panel functions can also be executed by commands from a remote computer. The host computer can communicate to the PPC2+ using the PPC2+ COM1 RS-232 port or the IEEE-488 port. Before writing test code which makes use of PPC2+ remote commands, familiarize yourself with its operating principles by reading Section 3 of this manual.
Page 86: Ieee-488
PPC2+™ Operation and Maintenance Manual Table 10. Pin Designations and Connections PPC2+ COM1 DB-9F PIN DESIGNATIONS PIN # FUNCTION DESCRIPTION This pin transmits serial data from the PPC2+ to the host. This pin accepts serial data from the host computer. This pin is the common return for the TxD and RxD signals.
Page 87: Programming Formats
PPC2+™ Operation and Maintenance Manual 4.3 PROGRAMMING FORMATS The PPC2+ program message set is downward compatible with the previous PPC2 program message set. PPC2+ also introduces a new enhanced program message format to support IEEE Std 488.2 syntax, format, and status reporting. The user must select whether to use either the original “classic”...
Page 88: Enhanced Program Message Using The Command Type
PPC2+™ Operation and Maintenance Manual 4.3.2.1 ENHANCED PROGRAM MESSAGE USING THE COMMAND TYPE The COMMAND type of program message executes a process and can additionally send data to the PPC2+ in the form of comma delimited arguments. This data is usually a setting of some sort that is stored in the PPC2+.
Page 89: Commands
PPC2+™ Operation and Maintenance Manual 4.4 COMMANDS 4.4.1 PROGRAM MESSAGES Shown are the basic program messages for the classic and the enhanced formats. There are also additional IEEE Std. 488.2 common commands (they start with an ‘*’) that are common in all IEEE-488.2 compatible devices These commands and the enhanced format status reporting model are covered in Sections 4.5 and 4.6.
Page 90 PPC2+™ Operation and Maintenance Manual Table 12. Program Message List (Continued) Set a new target pressure and use only the slow speed to reach the target. QPRR Read the last PPC2+ RPT pressure, rate and ATM. RANGE Read or set the active range of the PPC2+. RATE Read the next available rate of change of pressure.
Page 91: Error Messages
PPC2+™ Operation and Maintenance Manual 4.4.2 ERROR MESSAGES The PPC2+ will always reply to a program message while using the classic format. If the program message is incorrect or contains invalid data, an error number will be returned in the form <ERR#n>...
Page 92: Program Message Description Overview
PPC2+™ Operation and Maintenance Manual 4.4.3 PROGRAM MESSAGE DESCRIPTION OVERVIEW Each program message description is separated into the following sections: Purpose A brief description of the programs message’s function. Command This is the Enhanced program message syntax to send data to the PPC2+ or to execute a PPC2+ function.
Page 93: Program Message Descriptions
PPC2+™ Operation and Maintenance Manual 4.4.4 PROGRAM MESSAGE DESCRIPTIONS Â Purpose To allow the host PC to communicate with a device connected to the PPC2+ COM2 port. This program message is obsolete. You should instead use the “PASSTHRU” program message. This command is not available when using the enhanced command format.
Page 94 PPC2+™ Operation and Maintenance Manual Â aincal Purpose To set or retrieve the measurement modifiers (adder multiplier) for the current analog input range. Query “AINCALn a,m” “AINCALn?” Classic “AINCALn=a,m” “AINRNG” Default “AINRNGn 0,1” Arguments The input channel to modify (1 through 4). The adder modifier in the current range units (V, mV or mA).
Page 95 PPC2+™ Operation and Maintenance Manual Â AINRNG Purpose To set or retrieve the current analog input range. Query “AINRNG n” “AINRNG?” Classic “AINRNGn” “AINRNG?” Default “AINRNG 3” Arguments The input range index 1 for 100 mv range 2 for 5 Volt range 3 for 10 Volt range 4 for 4-20 ma range Remarks...
Page 96 PPC2+™ Operation and Maintenance Manual Â AUTOPURGE Purpose Read or set the status of the automatic purge function. Command “AUTOPURGE n ” Query “AUTOPURGE?” Classic “AUTOPURGE= n ” “AUTOPURGE” Default “AUTOPURGE 0” Arguments ’0’ To disable AUTO mode. ’1’ To enable AUTO mode. Remarks The PPC2+ can automatically control the external SPLT functions if desired.
Page 97 PPC2+™ Operation and Maintenance Manual Â AUTOZERO Purpose Read or set the status of the automatic zero function. Command “AUTOZERO n ” Query “AUTOZERO?” Classic “AUTOZERO= n ” “AUTOZERO” Default “AUTOZERO 1” Arguments ’0’ Autozero OFF ’1’ Autozero ON Remarks The PPC2+ autozero function can be turned ON and OFF.
Page 98 PPC2+™ Operation and Maintenance Manual Â COM2 Purpose Read or set the RS-232 settings for the COM2 port. Command “COM2 baud,parity,data,stop ” Query “COM2?” Classic “COM2= baud,parity,data,stop ” “COM2” baud : Arguments The baud rate. This may be ‘300’, ‘600’,’1200’,’2400’,’4800’, ‘9600’ or ‘19200’...
Page 99 PPC2+™ Operation and Maintenance Manual Â DEVICE This is an obsolete PPC2 Command. Purpose PPC2+ does not support external devices so the “DEVICE” Command is not supported. Will respond ERR# 9. None Purpose Decrease the pressure quickly. Command “DF n ” Classic “DF= n ”...
Page 100 PPC2+™ Operation and Maintenance Manual Â DRVN Purpose Read or set the status of the external electrical driver. Command “DRV n x ” “DRV n ?” Query Classic “DRV n=x ” “DRV n ” Arguments The driver to operate. This can be from 1 to 8. The state to change the driver to;...
Page 101 PPC2+™ Operation and Maintenance Manual Â HEAD Purpose Read or set the head settings. Command “HEAD h,u,g ” Query “HEAD?” Classic “HEAD= h,u,g ” “HEAD” Defaults “HEAD 0,cm,N2” Arguments The height of the test in relation to the PPC2+. This will be positive if the test is above the PPC2+, or negative if below the PPC2+.
Page 102 PPC2+™ Operation and Maintenance Manual Â Purpose Read or set the hold limit for automated pressure control in percent of range full scale. Command “HS% n ” Query “HS%?” Classic “HS%= n “HS%” Arguments The hold limit in % FS of the current active range. Remarks The hold limit can be read and set as a pressure or as a percent of the range.
Page 103 PPC2+™ Operation and Maintenance Manual Â Purpose Increase the pressure slowly. Command “IS n ” Classic “IS= n ” Arguments ‘0’ Closes the slow up valve. ‘1’ Opens the slow up valve. Remarks Opening the slow up valve will cause the pressure to increase slowly. Care must be used, as the pressure will not stop increasing until the valve is closed, or the upper limit is passed.
Page 104 PPC2+™ Operation and Maintenance Manual Â LOCAL Purpose Returns control to the PPC2+ front panel. Command “LOCAL” Classic “LOCAL” Remark The REMOTE program message can lock the front panel out completely. The user can return to local operation by sending the LOCAL program message, sending the IEEE-488 ‘GTL’...
Page 105 PPC2+™ Operation and Maintenance Manual Â MSGFMT Purpose Read or set the type of program message format to use. Command “MSGFMT n Query “MSGFMT?” Classic “MSGFMT= n “MSGFMT” Arguments ‘1’ to use the enhanced command format. ‘0’ to use the classic command format. Defaults “MSGFMT 0”...
Page 106 PPC2+™ Operation and Maintenance Manual Â PASSTHRU Purpose To allow the host PC to communicate with a device connected to the PPC2+ COM2 port. Command “PASSTHRU n Query “PASSTHRU?” Classic “PASSTHRU= n ” “PASSTHRU” Arguments The string to send out of the COM2 port. It must be less than 40 characters long.
Page 107 PPC2+™ Operation and Maintenance Manual Â PCALn:HI and PCALn:LO Purpose Read or set the user RPT calibration information. Command “PCAL n :HI adder, mult, CalDate ” “PCAL n :LO adder, mult, CalDate ” “PCAL n :HI?” Query “PCAL n :LO?” Classic “PCAL n :HI = adder, mult, CalDate ”...
Page 108 PPC2+™ Operation and Maintenance Manual Â Purpose Read the next available pressure. Query “PR?” Classic “PR” Remarks The next available pressure value for the active RPT and range is read in the current pressure units. The data returned also contains ready information, and the pressure units.
Page 109 PPC2+™ Operation and Maintenance Manual Â Purpose Set a new target pressure and start a new pressure generation cycle. Allows the test volume to be specified which causes the pressure generation cycle to be executed omitting the automated control configuration routine. Command “PS n (,v) ”...
Page 110 PPC2+™ Operation and Maintenance Manual Â This is an obsolete PPC2 Command. Purpose Has the same effect as the PS Command. “PS” Purpose Set a new target pressure and use just the slow speed to generate the pressure. Command “PSS n ” Classic “PSS= n ”...
Page 111 PPC2+™ Operation and Maintenance Manual Â QPRR Purpose Read the last RPT pressure, rate. and ATM pressure. Query “QPRR?” Classic “QPRR” Remarks The last measured ready condition, pressure rate of pressure change, and ambient pressure for the active RPT (Lo or Hi) and range is returned in the current pressure units.
Page 112 PPC2+™ Operation and Maintenance Manual Â RANGE Purpose Read or change the active RPT range. Command “RANGE n : XX ” Query “RANGE?” Classic “RANGE= n : XX ” “RANGE ” Default “RANGE 3,HI” Arguments ‘1’ for the low range of the selected RPT. ‘2’...
Page 113 PPC2+™ Operation and Maintenance Manual Â READYCK Purpose Read or set the ready check flag. Command “READYCK 1” Query “READYCK?” Classic “READYCK=1” “READYCK” Remarks The internal ready check flag is cleared whenever the PPC2+ reaches a Not Ready (NR) condition. The “READYCK” query will return the status of this flag. This flag is set by sending the “READYCK 1”...
Page 114 PPC2+™ Operation and Maintenance Manual Â Purpose To read or set the pressure display resolution for the current RPT and range. Command “RES n ” “RES” Query Classic “RES= n ” “RES” Default “RES 0.001” Arguments The pressure display resolution in % FS of the current RPT range (0.0001 to 1 % FS).
Page 115 PPC2+™ Operation and Maintenance Manual Â RETURN Purpose Start a new generation using the current target pressure. Command “RETURN” Classic “RETURN” Remarks The “RETURN” program message will start a new pressure generation using the current settings and target pressure. Generation will continue until a new target pressure is set, the PPC2+ goes into LOCAL mode, or an “ABORT”...
Page 116 PPC2+™ Operation and Maintenance Manual Â Purpose Read the next available ready/not ready status. Query “SR?” Classic “SR” Remarks The current ready status can be read using this program message. If the reply is “NR”, then the pressure is Not Ready within the limits defined by the control mode and current control parameters.
Page 117 PPC2+™ Operation and Maintenance Manual Â STAT Purpose Read the pressure generation status. Query “STAT?” Classic “STAT” The generation cycle status can be checked using this program message. The reply Remarks is a numeric code which references a specific generation action: Multiple codes are returned by logically ORing them together.
Page 118 PPC2+™ Operation and Maintenance Manual Â TOUT This is an obsolete PPC2 Command. Purpose PPC2+ does not support external devices so the “TOUT” command is not supported. Will respond ERR# 9. None Purpose To read the current target pressure. Query “TP?”...
Page 119 PPC2+™ Operation and Maintenance Manual Â UCOEF Purpose To convert 1 Pascal to the current pressure units. Query “UCOEF?” Classic “UCOEF” Remarks The PPC2+ handles all pressure values internally in Pascal. The coef replied is equivalent of 1 Pa. This program message allows the user to convert pressures Example Query sent: “UCOEF?”...
Page 120 PPC2+™ Operation and Maintenance Manual Â Purpose Read or set an upper limit for the current RPT and range. Command “UL n ” Query “UL” Classic “UL= n ” “UL” Arguments The upper limit pressure in the current pressure units. This value is always in absolute units if the RPT is absolute, or gauge units if the RPT is gauge.
Page 121 PPC2+™ Operation and Maintenance Manual Â UNIT Purpose Read or set the pressure display unit and measurement mode. Command “UNIT unit (, ref ”)” “UNIT unit g (, ref ”)” “UNIT unit a (, ref ”)” Query “UNIT?” Classic “UNIT= unit (, ref ”)” “UNIT= unit g (, ref ”)”...
Page 122 PPC2+™ Operation and Maintenance Manual Â Purpose Read or set the control ref status. Command “VAC n ” Query “VAC?” Classic “VAC= n ” “VAC” Default “VAC 0” ’0’ To disable auto mode and specify that the PPC2+ EXHAUST port Arguments is open to atmosphere.
Page 123 PPC2+™ Operation and Maintenance Manual Â Purpose Read the PPC2+ version. Query “VER?” Classic “VER” Remarks The software version of the PPC2+ can be read. This is useful for checking presence of the PPC2+ and for reference purposes. Example Query sent: “VER?”...
Page 124: Status Reporting System
PPC2+™ Operation and Maintenance Manual Â ZNATERRn:HI and ZNATERRn:LO Purpose Read or set the autozero natural error (ZNATERR) for the selected RPT range and measurement mode. Command “ZNATERR n :HI NatErr, Date ” “ZNATERR n :LO NatErr, Date ” “ZNATERR n :HI?” Query “ZNATERR n :LO?”...
Page 125: Status Byte Register
PPC2+™ Operation and Maintenance Manual 4.5.2 STATUS BYTE REGISTER The PPC2+ contains an 8 bit Status Byte Register that reflects the general status of the PPC2+: Table 14. 8 Bit Status Byte Register OPER RQS/MSS ERROR (128) (64) (32) (16) Â...
Page 126 PPC2+™ Operation and Maintenance Manual The Status Byte Register can be read using the “*STB?” query, or by performing a serial poll on the IEEE-488 bus. If you read this using a serial poll then Bit 6 is the RQS. If the “ STB?” query is used, then bit 6 is the MSS bit.
Page 127: Standard Event Register
PPC2+™ Operation and Maintenance Manual 4.5.3 STANDARD EVENT REGISTER The PPC2+ contains an 8 bit Standard event register that reflects specific PPC2+ events. Enabled events in this register will set or clear the ESB bit of the Status Byte Register. Table 15.
Page 128: Ready Status Register
PPC2+™ Operation and Maintenance Manual 4.5.4 READY STATUS REGISTER The PPC2+ contains an 8 bit Ready Status Register that reflects specific PPC2+ measurement and generation ready events. Enabled events in this register will set or clear the RSB bit of the Status Byte Register. Table 16.
Page 129: Program Message Descriptions
PPC2+™ Operation and Maintenance Manual 4.6.1 PROGRAM MESSAGE DESCRIPTIONS Purpose Clear all of the status & event structures. Command “ CLS” Remarks This program message clears the following events and status registers: Standard Byte Register (STB) Standard Event Status Register (ESR) Error Queue Pending OPC operations Example...
Page 130 PPC2+™ Operation and Maintenance Manual Â Purpose Sets the operation complete bit when all operations have completed. Command “ OPC” Query “ OPC?” Remarks This Command enables the PPC2+ to set the OPC bit in the Standard Event Status Register when it has completed all pending functions. The Query replies with a “1”...
Page 131 PPC2+™ Operation and Maintenance Manual Â Purpose Read or set the Service Request Enable Register. Command “ SRE n ” Query “ SRE?” Default “ SRE 0” Arguments ’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 133: Maintenance, Adjustments And Calibration
PPC2+™ Operation and Maintenance Manual 5.1 OVERVIEW PPC2+ was designed for maintenance free operation. No maintenance is required other than: Rezeroing of reference transducers (RPT) as needed (see Section 3.4.1). Regular reference transducer calibration (see Section 5.2). Adjustment of the on-board barometer as needed (see Section 5.3). Automated adjustment of pressure controlling parameters as needed (see Section 5.5).
Page 134: Calibration Of Reference Pressure Transducers
PPC2+™ Operation and Maintenance Manual 5 . 2 CALI BR ATION OF REFERE N C E PR ESSU R E T RANSDUCERS 5.2.1 PRINCIPLE PPC2+ has one or two reference pressure transducers (RPT) that are the source of accurate pressure measurement for the system. Each transducer has three independent ranges. To calibrate a range, pressures from a standard are applied to the RPT at ascending and descending points over the range.
Page 135: Pa/Pm Coefficients
PPC2+™ Operation and Maintenance Manual 5.2.1.1 PA/PM COEFFICIENTS The coefficients used to adjust RPT readings are designated PA (an adder or offset) and PM (a multiplier or span set). The coefficients affect the RPT reading following: Corrected reading = (uncorrected reading o PM) + PA PA is expressed in units of pressure (always the SI unit, Pascal).
Page 136: Order Of Operations
PPC2+™ Operation and Maintenance Manual 5.2.1.3 ORDER OF OPERATIONS If the PPC2+ has an absolute Lo RPT (AXXXX) and an absolute Hi RPT (AXXXX), and the Hi RPT will be autozeroed by the Lo RPT (see Section 3.4.1), calibrate and determine the ZNATERR of the Lo RPT Range3 prior to calibrating the Hi RPT.
Page 137: Set-Up And Preparation
PPC2+™ Operation and Maintenance Manual Â Able to apply pressures at 20 % increments in the range to be calibrated: It is not necessary that the calibration pressure standard used apply precisely the nominal pressure value requested for a calibration point as long as the exact value of the applied pressure is known.
Page 138: Rpt Calibration Using Caltool For Rpts Software
PPC2+™ Operation and Maintenance Manual 4. Connect the calibration standard output to the PPC2+ rear panel TEST port (1/4 in. NPT F). Â 5.2.4 RPT CALIBRATION USING CALTOOL FOR RPTS SOFTWARE To calibrate PPC2+ using CalTool software (supplied on the General Accessories Disk), 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 (supplied on the General Accessories Disk).
Page 139: Setting Znaterr
PPC2+™ Operation and Maintenance Manual If in edit mode, the calibration information fields can be edited. Pressing [ENTER] from the ZNATERR field goes to the next view/edit screen: Edit field for value of PA if in edit mode. Current RPT measurement range. PM: 1.000000 Edit field for value of PM if in edit mode.
Page 140: Rpt Calibration/Adjustment Without Caltool For Rpts Software
PPC2+™ Operation and Maintenance Manual 5.2.7 RPT CALIBRATION/ADJUSTMENT WITHOUT CALTOOL FOR RPTS SOFTWARE m PRINCIPLE The reference pressure transducers 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 PPC2+.
Page 141: Adjustment Of On-Board Barometer
PPC2+™ Operation and Maintenance Manual ñ Enter the calibration pressure and PPC2+ readings into a spreadsheet. Calculate the “non-corrected” PPC2+ readings by backing out the PA, PM and ZOFFSET (absolute RPTs only) recorded in Steps ê and ‚ above, following: non-corrected reading = (corrected reading - PA + ZOFFSET)/PM ò...
Page 142: Calibration Of Analog Input
PPC2+™ Operation and Maintenance Manual 5.4 CALIBRATION OF ANALOG INPUT m PURPOSE To adjust the measurements made by the analog input option to compensate for external line conditions or to agree with an external voltage or current reference. 5.4.1 CALIBRATION PRINCIPLE The PPC2+ analog input option measures on four channels.
Page 143: User Adjustment Of Analog Measurement Ranges And Channels
PPC2+™ Operation and Maintenance Manual 5.4.1.2 USER ADJUSTMENT OF ANALOG MEASUREMENT RANGES AND CHANNELS For each channel in at each range, user definable measuring modifiers are available. The measured signal is modified using an Adder and a Multiplier. The initial measurement is multiplied by the Multiplier and then the Adder is added following: Displayed value = (Meas X Multiplier) + Adder;...
Page 144: Pneumatic Control Module Configuration
PPC2+™ Operation and Maintenance Manual 5.5 PNEUMATIC CONTROL MODULE CONFIGURATION m PURPOSE To run an automated routine that allows PPC2+ to readjust automated pressure control coefficients to take into account changes in the characteristics of its pressure control hardware over time or to return automated pressure control coefficients to factory default values. m PRINCIPLE PPC2+ uses default factory configuration coefficients in the pressure control algorithms used for automated pressure control.
Page 145 PPC2+™ Operation and Maintenance Manual Selecting <1Run> will cause the pneumatic module configuration routine to execute. Before running a user Config, remove any external volume, plug the TEST port, and connect the normal supply pressure to the rear panel SUPPLY port. Â...
Page 146: Overhaul
PPC2+™ Operation and Maintenance Manual 5 . 6 OV ERHAUL Â Any or all of the following items may be included as part of a system maintenance overhaul: Disassemble pneumatic module filters and clean filter elements. Replace, if necessary. Clean front panel. Clean threads of rear panel fittings.
Page 147: Subassembly Description And Location
PPC2+™ Operation and Maintenance Manual 5 . 8 S UBASSE MBLY DE SC RIP TIO N A N D L O C AT I O N 5.8.1 INTERNAL VIEW Hi Reference Transducer Driver Board Lo Reference Pressure Transducer Analog Board (Optional) Pneumatic Module On-Board Barometer Micro Card...
Page 148: On-Board Barometer
PPC2+™ Operation and Maintenance Manual 5.8.1.1 ON-BOARD BAROMETER The barometer board supports a board mounted, barometric range, micromachined silicon sensor and an ambient temperature sensor. The barometer readings are used for dynamic atmospheric pressure compensation when measuring gauge pressure with an absolute reference transducer (see Section 3.4.1). The temperature sensor is used for temperature compensation of the barometric sensor.
Page 149: Pneumatic Module
PPC2+™ Operation and Maintenance Manual Hi Reference Pressure Transducer (Hi Rpt) In single RPT PPC2+s, the RPT is designated the Hi RPT. In dual RPT models, the Hi RPT is the RPT with the highest pressure range. Lo Pressure Reference Transducer (Lo Rpt) In dual RPT PPC2+s, the RPT with the lower range is designated the Lo RPT.
Page 151: Troubleshooting
PPC2+™ Operation and Maintenance Manual 6.1 OVERVIEW PPC2+ 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 PPC2+ operation.
Page 152 PPC2+™ Operation and Maintenance Manual Table 18. Troubleshooting Guide (Continued) SYMPTOM POSSIBLE CAUSE SOLUTION Front panel display is dim. Screen saver option has Press any key to resume full activated. screen power. Adjust, if desired (Section 3.4.4.9). Cannot access certain User levels have been set that Change user level or consult functions.
Page 153 PPC2+™ Operation and Maintenance Manual Table 18. Troubleshooting Guide (Continued) SYMPTOM POSSIBLE CAUSE SOLUTION Disagreement between Readings by different ranges at Check that ZOFFSET value is measurements made by the same pressure can in tolerance and verify value of different ranges at the same disagree even after a valid ZNATERR.
Page 154 PPC2+™ Operation and Maintenance Manual Table 18. Troubleshooting Guide (Continued) SYMPTOM POSSIBLE CAUSE SOLUTION Poor pressure control Excessive leak present in Correct internal or external characterized by excessive system. leak or increase hold limit pressure noise at control point (Sections 3.2.8, 3.2.6). and/or hunting around target.
Page 155 PPC2+™ Operation and Maintenance Manual Table 18. Troubleshooting Guide (Continued) SYMPTOM POSSIBLE CAUSE SOLUTION Apparent inaccurate pressure AutoZ has been run and turned Check value of ZOFFSET. measurement control. ON with an incorrect standard Rerun autoZ with a valid ZSTD for zero.
Page 157: Appendix
PPC2+™ Operation and Maintenance Manual 7.1 DRIVERS The PPC2+ drivers option provides eight open collector drivers for operating external valves, solenoids, indicators, etc. When operating from the setup-driver screen (see Section 3.3.4), pressing enter will allow the operating mode of the drivers to be set. The two modes of operation are Momentary and Toggle.
Page 158: Table 20. External Drivers
PPC2+™ Operation and Maintenance Manual Table 20 and Figure 14 should be used as reference when building a cable to utilize the drivers port. Table 20. External Drivers EXTERNAL DRIVERS DESCRIPTION Driver #1 (Open Collector) Driver #2 (Open Collector) Driver #3 (Open Collector) Driver #4 (Open Collector) Driver #5 (Open Collector) Driver #6 (Open Collector)
Page 159: Analog
PPC2+™ Operation and Maintenance Manual 7.2 ANALOG Table 21 should be used to correctly build the interfacing cable required to connect analog signals to the PPC2+ analog input option. Table 21. Analog Port/Signal Descriptions PPC2+ ANALOG PORT (15 PIN DSUB) PIN NO. SIGNAL DESCRIPTION Power Common Power Common...
Page 160: Unit Conversion
PPC2+™ Operation and Maintenance Manual 7.3 UNIT CONVERSION 7.3.1 PRESSURE PPC2+ 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.
Page 161: Warranty Statement
PPC2+™ Operation and Maintenance Manual 8.1 OVERVIEW 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. Products which have been changed or altered in any manner from their original design, or which are improperly or defectively installed, serviced or used are not covered by this warranty.
Page 162: Table 23. Warranty Service Centers
PPC2+™ Operation and Maintenance Manual Table 23. Warranty Service Centers DH INSTRUMENTS, INC. AUTHORIZED SERVICE PROVIDERS 2000 JAN NORMAL TELEPHONE, FAX SUPPORT COMPANY ADDRESS EMAIL REGION DH Instruments, Inc. 4765 East Beautiful Lane Tel 602.431.9100 Worldwide Phoenix AZ 85044-5318 Fax 602.431.9559 jbaines@dhinstruments.com Minerva I.P.&M.
Page 163: Glossary
PPC2+™ Operation and Maintenance Manual Absolute Mode Measurement mode in which the RPT indicates absolute pressure (difference from vacuum). Atm Ref The on-board barometer reading. 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 164 PPC2+™ Operation and Maintenance Manual Head A difference in height between the PPC2+ reference level and the DUT. Hold Limit An automated pressure control parameter. Maximum acceptable difference between the current pressure and the target pressure value. Measurement Mode Whether pressure is being measured relative to absolute zero or vacuum (absolute mode) or relative to atmospheric pressure (gauge mode).
Page 165 PPC2+™ Operation and Maintenance Manual ZNATERR The disagreement between the RPT indication and ZSTD at the autozero pressure just after the RPT has been calibrated. ZCURERR The disagreement between the RPT indication and ZTSD at some time after the RPT has been calibrated. ZOFFSET ZCURERR corrected for ZNATERR (the value used to autozero the RPT range).

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DH Instruments PPC2 PLUS Manual

1 Introduction

2 Installation

3 Operation

4 Remote Operation

5 Maintenance, Adjustments and Calibration

6 Troubleshooting

7 Appendix

8 Warranty Statement

9 Glossary

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