Routine Maintenance: Inlets
Maintaining a split/splitless inlet
Released: March 2004 6850 Series II GC User Information page 130 of 256
Correcting leaks
Materials needed:
• Electronic leak detector suitable for the gas type
• Tools to tighten parts of the inlet that leak (if leaks are detected)
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 0.5 psi, 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 manifold.
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
• The knurled nut
• The septum purge cap (septum head only)
• The connections for the carrier gas and septum purge (septum head only)
• The lower inlet seal at the bottom of the inlet
• The inlet bottom cap
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