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Preventive Maintenance
Flame ionization detector (FID)
173
18789-80070 0.030 Packed Column Only
(FID only: Simulated Distillation,
TCD-to-FID series operation)
18710-20119 0.018 Packed Column
(Standard, FID and NPD)
19244-80560 0.011 Capillary Column
(FID and NPD)
(FID: high sensitivity, packed column)
Part No. UseJet Tip ID (inch)*
NOTE: The 0.011-inch jet optimizes performance with capillary columns.
If used with packed columns, FID flame-out may occur with solvent peaks.
* Measured at the jet tip.
Table 8-1. Available FID/NPD Jets
Because jet exchange requires disassembling the collector assembly from
the detector base, it is also a convenient opportunity to inspect the
detector collector and base for contaminating deposits. Proceed to the
next section to disassemble the detector, to exchange the jet, and to
perform any necessary cleaning.
Cleaning
Both the jet and the collector bore require occasional cleaning to remove
deposits (usually consisting of white silica from column bleed, or black,
carbonaceous soot). Such deposits reduce sensitivity and cause
chromatographic noise and spikes.