Programmed Temperature Vaporization Inlet (Ptv) Theory Of Operation; Sampling Heads - Agilent Technologies 6890 Series Service Manual

240 Programmed Temperature Vaporization Inlet (PTV)
Theory of operation

Sampling heads

The septum head uses either a regular septum or a Merlin microseal to seal
the syringe passage. A stream of gas sweeps the inner side of the septum and
exits through the septum purge vent on the pneumatics module. It may be
used with either automatic or manual injection.
The septumless 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.
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Inlets
Agilent 6890 Gas Chromatograph Service Manual
Jun 2001