Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 306
Refer to the following diagram for flow
measurement and troubleshooting:
Partially clogged, restricted FID jet
A leak around the jet seal will result in correct H
2
flow
A leak at the column fitting will allow H
2
to leak into the
FID gang fitting
H
2
makeup flow comes down the outside of the jet
and up the
measurement, however the H
2
is not going through the jet
but around it. The flame will be unstable and hard to light.
center, sweeping outside of the column. Since these flows are pressure controlled,
a restricted jet will reduce the H
2
and makeup
flows are
pressure controlled, a
oven. The flame will be difficult to light or keep lit.
Makeup in
Air in
H
2
in
PS
PS
PS
Restrictors
Pressure
sensors
Proportional
valves
Filter
frits
Air inlet
H2/Makeup
gas inlet
EPC Module
restricted jet will reduce the H
2
and makeup flows
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