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The diagram below shows a 7-mL leak at the
inlet gold seal. The total flow reads 12 mL/min
which is the sum of column + septum purge and
leak
Carrier supply
total flow in
100 psi
input pressure
Proportional
valve 1
Reduced flow
Full flow -
split flow path
Released: April 2004
.
Forward pressure control loop
Flow sensor
12
mL/min
Total flow
control loop
Column flow: 2 mL/min
6850 Series Gas Chromatograph Service Procedures
Septum purge
regulator
fixed @ 3 mL/min
20 psi
Pressure sensor
Split vent trap
Purge valve
closed
Proportional
7 mL/min
Gold seal leak
Split vent
0 mL/min
valve 2
289
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