6 Troubleshooting
6.1 Troubleshooting
75FPD-2010
6.
Abnormal
Cause Countermeasures
Quenching occurs.
to “9.1 Quenching”.(Refer )
• Remove the impurities in air.
the analysis conditions.•Check
peak form
7.
Other abnormal phenomena
As for the phenomena shown below, refer to “Troubleshooting” in the instruction manual of the gas
chromatograph.
•Gas leakage does not stop.
•The temperature does not rise.
• Column inlet pressure or total flow rate cannot be set, or the difference is severe.
• Ghost peak.
• Abnormal peak form.
• Repeatability of retention time is low.
• Repeatability of peak area is low.
• APC does not indicate a fixed value.
There is a large quantity of impurities in the carrier and
detector gases.
• Purge the air mixture inside the flow line com-
pletely.
•Replace the Filter (Molecular Sieve Filter, Gas Fil-
ter or Oxygen Trap).
•Replace the piping parts.
•Replace the gas container, changing to a gas of
higher purity.
Stray light Determine from where the light is leaking by using a
dark film and stop the stray.
The flow rate of H2 or air is inappropriate. Correct the flow rate.
The detector unit (Quartz Cylinder, Quartz Window, Fil-
ter or Photomultiplier) is contaminated.
Clean or replace. (Refer to “5 Maintenance and Inspec-
tions”.)
Sample is adsorbed to the column or the detector. Examine the analysis conditions.
Shield ring position is inadequate. Set the shield ring to appropriate position.
Cause Countermeasures
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