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Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Programmed Temperature Vaporization Inlet (PTV) 240
Replacement procedures
8. Check all connections for leaks. If necessary, the retaining nut can be
tightened an additional 1/4 turn to eliminate leaks.
Replacing 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. To replace the septum, cool the inlet to ambient temperature.
2. Unscrew (counterclockwise) the septum cap or Merlin 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 with the visible metal
parts faces the oven.
Figure 240-23 PTV septa
5. Check for leaks out of the cap and tighten the cap if necessary.
Replacing the liner
1. Remove the head from the inlet.
2. Grasp the liner by the Graphpack ferrule. Remove the liner and ferrule.
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