Routine Maintenance: Inlets
Maintaining a split/splitless inlet
Released: March 2004 6850 Series II GC User Information page 126 of 256
Replacing the inlet base seal
Replace the inlet base seal whenever you loosen or remove the reducing nut.
Chromatographic symptoms such as ghost peaks indicate that the inlet base
seal is dirty and needs replacement.
You change the inlet base seal from inside the oven, so you must remove the
column.
Materials
• T-20 Torx screwdriver
• 1/2-inch wrench
• A new washer (part no. 5061–5869)
• Gold-plated seal (part no. 18740–20885) or stainless steel seal
(part no. 18740–20880)
Procedure
Warning Be careful! The oven and/or inlet may be hot enough to cause burns.
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.
3. Remove the column from the inlet. Cap the end of the column to prevent
contamination. Remove the insulation cup around the base of the inlet.
4. Use a wrench to loosen and remove the reducing nut. The washer and seal
are inside the reducing nut. Remove them.
Caution Wear gloves to protect the inlet base seal and washer from contamination.
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