Routine Maintenance: Inlets
Maintaining a PTV
Released: March 2004 6850 Series II GC User Information page 161 of 256
If you have access to a Control Module, you can perform this test
automatically. See its documentation for details. The Control Module test
program will prompt you to complete the hardware tasks outlined below.
Warning Be careful! The oven and/or inlet may be hot enough to cause burns.
Materials needed:
• 7/16-inch wrench
• Gloves (if the inlet is hot)
• Septum nut wrench (part no. 19251-00100)
• 9/16-inch wrench
• 1/8-inch no-hole (solid) Vespel type ferrules, 0100-1372
• 1/16-inch no-hole Vespel type ferrules, 5181-7458
• 1/8-inch Swagelok nut, 5180-4103
• Capillary column nut
•Septum
• Column nut, 5181-8830
• Vespel/graphite blank ferrule, 5020-8294
Procedure
1. Load the SERVICE method or reset the inlet and oven temperatures to
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. Remove the column, if one is installed, and plug the column fitting with the
column nut and a no-hole ferrule.
4. Remove the old septum and replace it with a new one. For instructions,
see “Changing the septum”.
5. Remove the column from the inlet fitting on the inside of the oven.
6. If a septum head is installed, and the quality of the septum (or Microseal)
and GRAPHPACK-3D ferrule on the glass liner are unknown, replace them
now.
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