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Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Flame Ionization Detector (FID) 310
Replacement procedures
When replacing the collector body, make sure the longer shaft on the
collector with the cone-shaped indentation rests on top of the FID jet and
make sure the contact spring makes good contact with the groove on the
collector.
The collector nut should be finger-tight.
Note The collector insulators should be clean to avoid current leakage. Washing
them with a high quality grade methyl alcohol and drying them under
moderate heat (<100° C) prior to reinstallation is recommended.
Replacing the FID jet
WARNING Before proceeding, turn off the oven and any heated zones and let them cool
down. Turn off any detector gases at their supply, then turn off the main
power switch and unplug the power cord.
1. From inside the oven, remove the column and column nut.
2. On top of the GC, use a Torx T-20 screwdriver to remove the three screws
on top of the collector block and remove the block.
3. Use a 1/4-inch FID nut driver to remove the jet from the collector
weldment. You may need a pair of tweezers to lift the jet out.
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