2. INSTALLATION
Page 11 © 2002-2007 DH Instruments, a Fluke Company
Do not apply pressure to the TEST(+) port without having a pressure supply equal to or
greater than the applied pressure connected to the SUPPLY port. When controlling
pressure to the TEST(+) port externally, do not cause the pressure to change at a very
rapid rate. For example, do not vent suddenly by opening an external valve. Internal
damage to the PPC3 may result.
Do not connect a pressure supply to the TEST(-) port. The pressure applied to this port
should be maintained at atmospheric pressure (between 70 and 110 kPa (10 and 16 psia)).
Exceeding these limits may damage a Gxxx or BGxxx Q-RPT and/or the PPC3’s
on-board barometer.
Operating the PPC3 connected to a system with liquid contaminants without taking
proper precautions to purge the system and test line may cause contamination of the
PPC3 that will require non-warranty service.
Minimizing the length of the test connection tubing will enhance control performance and
reduce pressure setting time. For normal operation, the total volume of the device or
system under test including connecting tubing should be less than 1 000 cc (60 in
3
)
up to 2 000 kPa (300 psi) and less than 500 cc (30 in3) above 2 000 kPa (300 psi).
Minimizing the length of the test connection tubing and restrictions in connections will
enhance control performance and reduce pressure setting time.
PPC3 pressure control will not operate properly if there are excessive leaks in the test
system. In general, the maximum acceptable leak rate for optimal PPC3 automated pressure
control operation and to assure in tolerance measurements with default pressure control
parameters is ± 0.5 % of set pressure/minute. In DYNAMIC CONTROL mode, to handle
higher test system leak rates, increase the hold limit using CUSTOM CONTROL (see
Section 3.4.6.1).
PPC3 pressure control may be adversely affected if the test connection tubing is too
restrictive. For optimum results, the inner diameter of the connecting hose should be
> 1.75 mm (0.07 in.), or more.
2.3.8.1 INSTALLING A SELF PURGING LIQUID TRAP (SPLT)
The SPLT (optional) is intended to collect and exhaust liquid or other
contaminants that may be present in the device or system under test so that they
do not return to contaminate the PPC3.
The SPLT is installed in the TEST(+) connection line at a low point between
PPC3 and the device or system under test. If the PPC3 system includes external
Q-RPTs in RPM4(s), the RPM4s should be connected on the PPC3 side of the
SPLT.
See the SPLT Operation and Maintenance manual for more complete
instructions on SPLT installation.
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