Inlets and valves
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 125
Correcting leaks (all inlets)
1. Use an electronic leak detector to check all
areas of the inlet that are potential sources
of a leak.
2. Tighten loose connections to correct leaks, if
necessary. You may need to repeat the leak
test.
If the pressure drop is now less than
• 0.3 psi (for the Cool on-column inlet)
• 0.5 psi (for the Split/splitless and PTV inlets)
• 0.7 psi (for the Purged packed inlet)
you can consider the inlet system leak-free. If
the pressure drops faster than the acceptable
rate, continue to search for leaks and repeat the
pressure test.
If all fittings appear to be leak free, but the inlet
system is still losing too much pressure, you may
need to replace the inlet module.
Potential leak points
Check the following areas (as applicable) when
checking an inlet system for leaks.
• The plugged column connection
• The septum and/or septum nut
• The cooling tower assembly
•The
¼-inch ferrule (if a liner is used)
• The O-rings and connections
• The area where gas line(s) are plumbed to
the inlet
• The capped purge vent
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