Routine Maintenance: Inlets
Maintaining a purged packed inlet
Released: March 2004 6850 Series II GC User Information page 143 of 256
Materials needed:
• Gloves (if the inlet is hot)
• A new Viton O-ring (part no. 5080-8898)
• Septum nut wrench (part no. 19251-00100)
• Forceps or tweezers (optional)
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. Also, make sure that:
• If you have entered parameters that you do not want to lose, store
them as a method
• If the detector is on, turn it off
2. Turn the inlet pressure off at the source.
3. If the inlet is hot, use the septum nut wrench. Loosen the knurled nut
completely. Pull up on the nut to remove the top portion of the inlet.
The O-ring will be visible. Remove the old O-ring. You may need to use
forceps to grab it. Using the tweezers, insert the new O-ring.
4. Replace the top portion of the inlet and tighten the knurled nut until you
cannot tighten it further. Restore the GC to normal operating conditions.
O-ring
Pulling up on the
entire top of inlet.
knurled nut removes
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