Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 318
If the FPD flame won’t light or stay lit, check/do
the following:
1. Be sure there is a problem. The flame
normally does not make any sound when it
ignites and the increase in signal offset on
the visual display is often only a few counts.
To verify flame ignition, remove the vent line
from the top of the detector and hold a
mirror or shiny surface near the aluminum
exhaust tube. If the flame is lit, condensa-
tion will form on the mirror.
Check the displayed air flow rate. The
display should go to 200 mL/min while trying
to ignite to flame. If not, there is insufficient
supply pressure.
2. Check the Lit offset value. If it is
zero, autoignition is turned off. If it is too
large, the software will not recognize that
the flame is lit and will shut the detector
down.
3. Increase the air supply pressure to the pneu-
matics module. This makes the flame easier
to light but does not affect the air flow rate
setpoint.
4. Under some operating conditions, the flame
may be more easily lit with the rubber drip
tube removed. After lighting the flame, rein-
stall the drip tube.
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