PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 36
3.2.8 LEAK CHECK/PURGE
PURPOSE
The LEAK CHECK function key accesses two functions:
1. The LEAK CHECK function to check the pressurized connections and device or system
under test for leaks (see Section 3.2.8.1).
2. The PURGE function to use the optional Self Purging Liquid Trap (SPLT) to collect and
exhaust liquid contaminants from the device or systems under test before they reach the
PPC2 AF.
PRINCIPLE
Leaks in the test system can have a detrimental effect on measurement accuracy and, when
large enough, can cause the PPC2 AF 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.
PPC2 AF is designed to precisely set, control and measure gas pressures. Liquid
contamination of the PPC2 AF internal pneumatic control module and reference pressure
transducers can cause poor pressure control and interfere with accurate pressure
measurement. Liquid contaminants that may be present in test devices or systems that are
connected to the PPC2 AF are likely to make their way back to PPC2 AF's internal pneumatic
system as the test device or system is pressurized and depressurized. To every extent
possible, only clean hoses and connections should be used in connecting PPC2 AF to test
devices or system and those devices and systems should be free of liquid contaminants.
However, it is likely that PPC2 AF will need to be used to test some devices or systems that
contain liquid contaminants. For this case, a Self Purging Liquid Trap (SPLT) accessory
supported by a PURGE function is available.
As the LEAK CHECK and PURGE functions are generally performed together at the
beginning of a test and there are commonalities to the procedures, PPC2 AF's LEAK and
PURGE functions are designed to operate together under a single LEAK CHECK function key.
OPERATION
To access the LEAK CHECK/PURGE function, from the main run screen press the LEAK
CHECK function key. The function can be accessed directly at any pressure in any range.
The first screen is the leak check screen (see Section 3.2.8.2).
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