Routine Maintenance: Inlets
Maintaining a PTV
Released: March 2004 6850 Series II GC User Information page 156 of 256
Changing the septum
Either a regular septum or a Merlin Microseal™ can be used with the septum
head.
If the inlet temperature is set below 40°C, the Merlin Microseal may not seal
effectively. For inlet temperatures below 40°C, use a regular septum for the
inlet seal.
1. Before replacing the septum, cool the inlet to ambient temperature. 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. Using the inlet tool or manually, unscrew the septum cap or Merlin cap
counterclockwise. If the septum head begins to turn, support it manually
while removing the cap.
3. Remove the septum or Merlin Microseal, taking care not to scratch the
interior of the septum head.
4. Install a new septum or Merlin Microseal and the correct cap. When
installing a Merlin Microseal, note that the side where the metal parts are
visible goes down.
5. Check for leaks out of the cap and tighten the cap if necessary.
Glass inlet liners
The liner is the chamber for sample deposition. Table 30 lists the liners
available for the PTV inlet.
Merlin
Microseal
and cap
Standard
septum
and cap
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