Routine Maintenance: Inlets
Maintaining a purged packed inlet
Released: March 2004 6850 Series II GC User Information page 137 of 256
Installing a liner
Use these instructions for installing all liner types. Graphitized Vespel ferrules
are recommended because metal ferrules tend to lock permanently onto the
liner. If a leak develops when using metal ferrules, you must replace the entire
liner.
Materials needed:
• Liner, brass nut, and ferrule (see Table 26 or Table 27)
• Lint-free cloth
• Methanol
• 9/16-inch wrench
1. Load the SERVICE method or reset the inlet and oven temperatures to
OFF or turn the main power switch off. Let the heated zones cool to room
temperature.
2. Turn the inlet pressure off at the source.
Warning Be careful. The oven and inlet fittings may be hot enough to cause burns.
3. If a column is installed, open the GC lid and remove the column from the
inlet.
4. If present, remove the old liner with a wrench.
5. Clean the end of the new liner with a lint-free cloth to remove
contamination such as fingerprints. Use methanol as a solvent.
6. Place a brass nut and graphitized Vespel ferrule on the liner.
7. Locate the inlet base and insert the liner straight into the inlet base as far
as possible.
8. Hold the liner in this position and tighten the nut finger tight.
9. Use a wrench to tighten the nut an additional 1/4 turn.
10. Install the column.
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