DH Instruments PPC4, Руководство по эксплуатации и обслуживанию

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PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 86
4.5.17 <Purge>

PURPOSE
To execute the PPC4 test system PURGE function using the optional Self Purging Liquid Trap
(SPLT). PURGE is used to collect and exhaust liquid contaminants from the device or system
under test before they reach the PPC4 (see Section 3.2.17).

OPERATION
Note
For the Purge function to execute, the function must have been enabled
using <Spec>, <Internal>, <Purge> (see Section 4.5.7.4) and an optional
Self Purging Liquid Trap (SPLT) must be installed in the test line (see
Section 2.3.7.1).
To purge the UUT and/or system under test using the PURGE function, proceed as follows:
Connect the system or device under test (UUT) to the PPC4 TEST(+) port:
Make sure the optional SPLT is properly installed between the UUT and the PPC4,
TEST(+) port including the electrical connection for the PPC4 DRIVER connector to the
SPLT valve. Always clean as much liquid and contamination as possible out of the UUT
before connecting it.
Set the purge pressure: Use the PPC4 direct pressure control keys (see Section 3.2.1)
or automated pressure control (see Section 4.2.1) to set the purge pressure.
The purge pressure should be roughly the UUT full scale or 1 MPa (150 psi), whichever is
lower. Avoid activating the purge function at pressure > 1 MPa (150 psi).
Select <Purge> from the Main Menu:
Note

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 with

.
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 PPC4 is reducing pressure to the
purge pressure of < 700 kPa (100 psi).
876.88 kPa a IH
Descending to purge
PPC4 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, PPC4 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,
PPC4 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.