PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 44
PPC3 internal vent valve is opened with the SPLT exhaust valve left open.
The PURGE function makes use of the PPC3 valve driver option. Valve driver number 8 is
used to actuate the SPLT exhaust valve. When making use of valve drivers, note that if
the PURGE function is enabled, valve driver number 8 will be actuated independently of
valve driver commands.
OPERATION
For the PURGE function to execute, the function must have been enabled using
[SPECIAL], <7internal>, <4purge> (see Section 3.5.7.4) and an optional Self Purging
Liquid Trap (SPLT) must be installed in the test line (see Section 2.3.8.1).
The most common use of the PURGE function is at the beginning of a test just after the
device or system under test has been connected to the PPC3 TEST(+) port. Generally, the
purge process should be completed before leak checking is performed.
To purge the DUT and/or system under test using the PURGE function, proceed as follows:
Connect the system or device under test (DUT) to the PPC3 TEST(+) port:
Make sure the optional SPLT is properly installed between the DUT and the PPC3,
TEST(+) port including the electrical connection for the PPC3 DRIVER connector to the
SPLT valve. Always clean as much liquid and contamination as possible out of the DUT
before connecting it.
Set the purge pressure: Use the PPC3 direct pressure control keys (see Section 3.1.3)
or automated pressure control (See Section 3.3.10) to the set purge pressure.
The purge pressure should be roughly the DUT full scale or 1 MPa (150 psi), whichever
is lower. Avoid activating the purge function at pressure > 1 MPa (150 psi).
Press [PURGE]:
Pressing [ESC] at any time during execution of the purge routine causes the purge
function to abort and returns to the MAIN RUN screen.
Confirm your intention to run the PURGE routine by pressing [ENT].
If the current pressure is over 700 kPa (100 psi) gauge, the display is:
1. Current measured pressure.
2. Active Q-RPT position designation.
3. Indication that PPC3 is reducing pressure to the purge
pressure of < 700 kPa (100 psi).
876.88 kPa a IH
Descending to purge
PPC3 controls pressure down to less than 700 kPa (100 psi), stops control and displays
<Preparing to purge> for five seconds. After the five second delay, PPC3 opens the
SPLT exhaust valve and displays <PURGING>.
Once the pressure reaches less than 20 kPa (3 psi) gauge or 110 kPa (16 psi) absolute,
PPC3 opens its internal vent valve and returns to the MAIN RUN screen in its normal
vented condition.
Repeat steps and until no liquids or other contaminants are expelled when the SPLT
exhaust valve opens.
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