User manual FLUKE PPC3

[. . . ] Operation and Maintenance Manual PPC3TM Pressure Controller/Calibrator © 2002-2007 DH Instruments, a Fluke Company High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases can be released unexpectedly and with extreme force. High pressure systems should be assembled and operated only by personnel who have been instructed in proper safety practices. This instrument is not to be operated in any other manner than that specified by the manufacturer. © 2002 - 2007 DH Instruments, a Fluke Company All rights reserved. Information in this document is subject to change without notice. [. . . ] The display is: Select: <1auto> To set the PPC3 to determine the EXHAUST port condition automatically using its internal exhaust sensor. To set the PPC3 to assume that a vacuum supply is connected to the EXHAUST port. To set the PPC3 to assume that the EXHAUST port is open to atmospheric pressure. To view the current EXHAUST port condition assumed by PPC3 and how it was determined. Control ref: 1auto 2vac 3atm 4view <2vac> <3atm> <4view> Before connecting a vacuum pump or vacuum source to the PPC3 EXHAUST port, see Section 2. 3. 6 for information on vacuum connection requirements and precautions. The ControlRef function setting is not range or control mode specific. The setting made in ControlRef is common across Q-RPTs and ranges as they are changed. 3. 5. 7. 3 <3BARO> PURPOSE To view the value of atmospheric pressure as measured by the PPC3 on-board barometer. There is no on-board barometer in PPC3's that have Gxxx (gauge) internal Q-RPTs only. © 2002-2007 DH Instruments, a Fluke Company Page 76 3. OPERATION PRINCIPLE PPC3's that include an Axxx (absolute) and/or BGxxx (bi-directional gauge) Q-RPT or a utility sensor (Auxxx)are equipped with a separate, on-board barometer. The atmospheric pressure measurements made by the on-board barometer are used for dynamic compensation of atmospheric pressure when using an Axxx Q-RPT to make gauge pressure measurements (see Sections 3. 3. 3, PRINCIPLE and 3. 2. 3) and for static pressure compensation when using a BGxxx Q-RPT. See Figure 13 for schematics showing the position of the on-board barometer in PPC3's measurement system. The on-board barometer is a low accuracy sensor used only for measuring small changes in atmospheric pressure over short periods of time (see Section 3. 2. 3) and for line pressure compensation when using a BG15K Q-RPT. PPC3 measurement uncertainty does not depend on the measurement uncertainty of the on-board barometer. OPERATION PPC3's that have only Gxxx Q-RPTs (no Axxx or BGxxx) are NOT equipped with an on-board barometer. To view the current reading of the on-board barometer press [SPECIAL], <7internal>, <3baro>. The display is in the active pressure unit of measure (see Section 3. 3. 2). 3. 5. 7. 4 <4PURGE> PURPOSE To enable and disable the PURGE function and [PURGE] key which automate use of the optional Self Purging Liquid Trap (SPLT) (see Section 3. 3. 8). OPERATION To access the purge enable/disable function press [SPECIAL], <7internal>, <4purge>. Select <1yes> to enable purge or <2no> to disable purge. When the purge function is enabled, PPC3 makes background use of valve driver channel #8 independently of user actions (see Sections 3. 3. 8, 3. 4. 7). 3. 5. 7. 5 <5LO VNT> PURPOSE To cause a PPC3 or external RPM4's Gxxx or BGxxx Q-RPT TEST(-) vent valve to stay open or closed rather than open and close automatically. This feature is active only when the active Q-RPT is a Gxxx (gauge) or BGxxx (bi-directional gauge) Q-RPT. Page 77 © 2002-2007 DH Instruments, a Fluke Company PPC3TM OPERATION AND MAINTENANCE MANUAL PRINCIPLE A PPC3 or an RPM4 equipped with a Gxxx (gauge) or BGxxx (bi-directional gauge) Q-RPT has a TEST(-) vent valve in its Q-RPT module (see Figure 13). The TEST(-) vent valve connects the TEST(-) port to the VENT port which also connects the Q-RPT and the device or system under test low side to atmosphere. In normal PPC3 operation, the TEST(-) valve is closed automatically whenever the PPC3 is performing fine pressure control to isolate the TEST(-) circuit from fluctuations in ambient pressure. This assures that the pressure in the TEST(-) circuit does not move too far away from atmospheric pressure as it might if it were permanently shut off. In normal RPM4 operation as an external device to a PPC3, the TEST() valve is normally closed. [. . . ] Indication used to indicate when control PPC3 pressure meets specific criteria for distance from target pressure and stability. Ready/Not Ready is indicated by an LED on the PPC3 front panel and is used to determine when test readings should be taken. Reference Pressure Monitor manufactured by DHI. RPM4s can be set up to act as external measurement devices to operate with PPC3. [. . . ]