170 Advanced Operation Manual
5 Detectors
How FID units are displayed in Agilent data systems and on the GC
The GC displays the FID signal in picoamperes (pA). The
following table lists how different data systems convert the
display units to reporting units.
Valve
Frit Frit
Valve
PS = Pressure Sensor
Column
PS
PS
PS
Valve
Frit
Restrictor Restrictor
Restrictor
EPC Module
H
2
Air
Vent
Makeup
Tabl e 42 Properties of the FID
Property Value/Comment
Dynamic range 1 x 10
7
Sensitivity 10 to 100 picograms of an organic compound
dependent on the molecular structure.
Selectivity Responds to all organic compounds (C-H bonds)
except those which do not burn or ionize in the
hydrogen-air flame. There is little or no response for
H
2
O, CO
2
, CO, N
2
, O
2
CS
2
or inert gases.
Formaldehyde and heavily halogenated compounds
give minimal response.
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