Flame Ionization Detector (Fid); Selecting An Fid Jet - Agilent Technologies 7820A Service Manual

Flame Ionization Detector (FID)

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Agilent 7820 GC Service
The FID is the most widely used of the GC detectors. It
responds to almost all organic compounds (there are a few
exceptions), has good sensitivity and a wide linear range, and is
easy to use.

Selecting an FID jet

Open the oven door and locate the column connection fitting at
the base of the detector. It will look like adaptable fitting.

If you have an application that tends to clog the jet, select a
jet with a wider tip id.

When using packed columns in high column-bleed
applications, the jet tends to clog with silicon dioxide.

In simulated distillation applications, the high-boiling
hydrocarbons tend to clog the jet.
For capillary optimized fittings, select a jet from the table below,
"Jets for capillary optimized fittings".