Routine Maintenance: Inlets
Maintaining a PTV
Released: March 2004 6850 Series II GC User Information page 151 of 256
4. Select the appropriate inlet adapter for the column to be installed. Insert a
new silver seal (part number 5182-9763, pkg of 5) into the adapter and
screw the adapter onto the inlet finger tight. Use the 6-mm wrench to
tighten the adapter an additional 1/16- to 1/8-turn.
Do not overtighten the adapter. The inlet can be damaged if the adapter is
forced. If the adapter leaks, check the silver seal and replace it if
necessary.
The septumless head
This sampling head uses a check valve instead of a septum to seal the syringe
entrance passage. It may be used with either automatic or manual injection.
Syringes must have 23 gauge needles (see “Consumables and replaceable
parts” on page 165).
Removing the septumless head
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. Disconnect the carrier gas line.
3. Unscrew the septumless head counterclockwise from the inlet.
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