Routine Maintenance: Inlets
Maintaining a cool on-column inlet
Released: March 2004 6850 Series II GC User Information page 181 of 256
Procedure
Warning To avoid a potential shock hazard when using liquid detection fluid, turn the
GC off and disconnect the main power cord. Be careful not to spill leak solu-
tion on electrical leads, especially the detector and inlet heater leads.
1. Using the leak detector, check each connection you have made for leaks.
2. Correct leaks by tightening the connections. Retest the connections;
continue tightening until all connections are leak-free.
3. Cap the septum purge vent with a 1/8-inch Swagelok cap.
Leak testing the cool on-column inlet
There are numerous places in the inlet that can leak. This procedure lets you
determine, in general, if there is an unacceptable leak in the inlet. If the inlet is
leaking, use an electronic leak detector to pinpoint the leaking component.
If you have access to a Control Module, you can perform this test
automatically. See its documentation for details. The Control Module test pro-
gram will prompt you to complete the hardware tasks outlined below.
Materials needed:
• 1/4-inch wrench
• Gloves (if the inlet is hot)
• 1/8-inch brass nut, 5180-4103
• 1/8-inch Vespel/graphite blank ferrule, 0100-1372
• Column nut, 5181-8830
• Vespel/graphite blank ferrule, 5020-8294
Procedure
Warning Be careful! The oven and/or inlet may be hot enough to cause burns.
This test requires either a Control Module or a ChemStation/Cerity Chemical to
edit setpoints.
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