Pulsed Splitless Mode - Agilent Technologies 6890 Series Service Manual

240 Programmed Temperature Vaporization Inlet (PTV)
Splitless modes

Pulsed splitless mode

The pressure pulse modes (using the septum- or septumless head) increase
inlet pressure just before the beginning of a run and return it to the normal
value after a specified amount of time. The pressure pulse sweeps the sample
out of the inlet and into the column faster, reducing the chance for sample
decomposition in the inlet.
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Inlets
Agilent 6890 Gas Chromatograph Service Manual
Jun 2001