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There will be no carrier flow, because the
column is disconnected and the detector
fitting plugged. Measure the H
makeup gas flows independently by turning
them on one at a time from the GC front
panel or Control Module. They should be
within ±10% of the setpoint. If the flows
are significantly off, the jet could be partially
plugged, there could be a leak anywhere in
the FID pneumatic system, or the detector
EPC module could be defective. Remember
that flow measurement from a soap film
bubble meter are affected by ambient pres-
sure. flow modules are calibrated at Stan-
dard Temperature and Pressure. For accurate
readings, use a true mass flow measurement
device (such as the Agilent Flow Tracker
1000). Resolve any flow control problems
and retest the FID noise.
Released: April 2004
6. Perform FID maintenance per the GC opera-
, air and
2
Brass castle
assembly
Teflon insulators
Collector
Sealing surface
Partially plugged jet
6850 Series Gas Chromatograph Service Procedures
tors manual.
300
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