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Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Purged/Packed Inlet 220
Theory of operation
Manually controlled inlet
In a manually controlled purged packed inlet, carrier gas flow enters through
the mass flow controller, into the top of the inlet. The septum purge regulator
(SPR) in the septum purge line, determines the fraction of the stream that is
split off to purge the septum. This fraction of the stream then flows out
through the purge vent. The majority of the carrier stream enters the inlet
insert and then the column.
Figure 220-3 Manual control packed column inlet (flow control mode)
Septum holder
Septum purge
regulator
Purge Vent Flow
SPR
To Co lu mn
and Detector
To t a l
flow
control
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