3 of 20
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Cool On-Column Inlet 230
Theory of operation
Manually controlled inlet
The manually controlled PCOC inlet has a forward pressure regulator (FPR)
that controls the column flow rate. In addition, a forward pressure regulator
with a fixed restrictor (SPR) is used to provide a nominal septum purge flow
rate of 15.0 mL/min. The sample is deposited directly into a capillary column
for analysis.
Figure 230-2 Manual control
Forward
pressure
regulator
Septum holder
Septum purge
regulator
SPR Purge Vent Flow
To D e tect or
Spring and
alignment insert
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