22 Troubleshooting
2 ALS and Detector Symptoms
FPD Does Not Ignite
• Check that the FPD temperature is high enough for
ignition (> 150 °C).
• Check FPD flow rates and that they match the type of
filter installed in the FPD.
• Measure the actual detector flows. (See To Measure a
Detector Flow.)
• The column may be installed too high into the detector.
• Check that the FPD ignitor operates. (See To Verify That
the FID Flame Is Lit.)
• Check the column and makeup flow rates.
• Ensure that condensation in the vent tube is not dripping
back into the detector. The flexible plastic vent tube must
run from the detector into a container, without sagging,
in order to properly drain water condensate. Keep the
open tube end out of the water in the container.
• Check the Lit offset value. The typical Lit offset value is 2.0.
• Thoroughly leak check the whole system. (See Checking
for Leaks.)
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