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FID - SRI Instruments
FID - Flame Ionization Detector
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Hydrocarbon selective
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Robust, linear, stable
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Detects down to 1ppm
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Unique ceramic ignitor can run hot
continuously to keep flame lit
The flame ionization detector is the most commonly used GC
detector, responding linearly from its minimum detectable quantity of
about 100 picograms to almost 100%.
The FID responds to any molecule with a carbon-hydrogen bond, but not at all, or poorly, to compounds such as H
2
S,
CCl
4
or NH
3
. The FID response is very stable from day to day, and is not susceptible to contamination from dirty samples
or column bleed.
Our FID employs a unique ceramic
ignitor which can run hot continuously,
immediately re-igniting the flame even
when presented with large water
injections or pressure surges from
column backflush.
The chromatogram at left shows 250
ppm C
1
-C
6
hydrocarbons (methane
through hexane) standard as detected
by the SRI FID. CO
2
, also at 250 ppm,
is converted to methane by the
accessory in the jet of the
FID detector.