270 Pneumatics Control Module
Leak testing the PCM
10 of 10
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Figure 270-4
PCM serviceable parts
Correcting leaks
1. Use the electronic leak detector to check all areas of the PCM that are
potential sources of a leak.
2. Tighten any connections which are leaking and re-test.
Note If the pressure drop is now 0.05 psi/min or less, you can consider the interface
system leak–free.
3. If the interface still leaks, continue to check for and correct leaks.
Potential leak areas
Check the following areas when checking for leaks in the PCM.
• The capped purge vent
• Three O-rings behind the block where the pneumatic lines enter the PCM
• Two O-rings for each valve in the PCM
Aluminum bracket
Septum purge fitting
O-ring
Supply fitting
Screws
Caution
Aluminum bracket removed for
clarity, DO NOT completely
remove the bracket during
valve replacement.
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