Routine Maintenance: Detectors
Maintaining the flame photometric detector (FPD)
Released: March 2004 6850 Series II GC User Information page 209 of 256
6. Under some operating conditions, the flame may be more easily lit with
the rubber drip tube removed. After lighting the flame, reinstall the drip
tube.
7. If the flame still will not light, there could be a large leak in the system.
This results in measured flow rates being different from actual flow rates,
causing non-ideal ignition conditions. Thoroughly leak check the whole
system.
8. If the analysis permits, substitute nitrogen for helium as carrier and
makeup.
9. Increase hydrogen and air flow rates until ignition occurs, then reduce
them toward the recommended values. Experiment for the best values.
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