Agilent Technologies 7890A Troubleshooting Manual page 43

FID Flame Goes Out During a Run and Attempts to Reignite
pA
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Troubleshooting
The following is an example chromatogram showing a
flameout from a large solvent peak.
2 3
After a flameout, the GC will try to ignite the flame three
times.
If the FID flame goes out during a run, do the following:
• See if an aromatic peak or water extinguished the flame.
• Check for a plugged jet.
• Verify that the gas flow settings are correct. Verify that Lit
offset is set appropriately.
If the FID flame attempts to reignite but is already lit, do
the following:
• Verify that the FID Lit offset setting is appropriate for the
run (typically
• Check to see if an aromatic peak or water extinguished
the flame.
• Check for a partially plugged jet. Measure actual
hydrogen, air, and makeup flows at the detector. (See "To
Measure a Detector Flow".)
• Check for leaks at the detector column fitting. (See
"Checking for Leaks".)
Chromatographic Symptoms
4 5 min
<
2.0 pA).
3
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