HP 5890 Series II Plus Reference Manual page 175

Preventive Maintenance
Flame ionization detector (FID)
Wash the collector in distilled water, hexane, and/or CH OH
(methanol). Dry in an oven at 70 C for at least 1/2•hour .
Figure 8-11
FID Collector Assembly
4. Using a 1/4•inchhex nut driver, unscrew (counterclockwise) and
remove the jet from the detector base.
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