5
Thermal Conductivity Detector (GC-8AIT, GC-8APT)
Detectors
Highly stable and sensitive filaments
The rhenium-tungsten filaments, each of which has a resistance
of 100Ω, ensure the highest sensitivity and stability.
Constant current system
The bridge current is kept constant even when the detector
temperature is changed. It is not necessary therefore to readjust
the current after the detector temperature is stabilized.
Filament protection
If some air should flow into the TCD cell, for example, at the
time of column replacement, the bridge current will
automatically be turned off and the warning lamp will be lit.
Flame Ionization Detector (GC-8AIF, GC-8APF)
Cylindrical collector
Combustion gases from the hydrogen flame pass from the
nozzle straight through the cylindrical collector to be
discharged externally. This reduces contamination of the
detector to extremely low levels.
On-detector system
The dead space is eliminated at the connection of the column
and the detector. Excellent repeatability is provided even in
analysis of trace components.
External igniter
The flame igniter is mounted external to the detector to
significantly reduce wire damage due to corrosive combustion
components and to make replacement of the igniter filament
cheap and simple.
Quartz jet
Collector electrode
High voltage electrode
Air
H
2
Column
Carrier gas
Fig. 9 FID Cell
Carrier gas
Filament
Fig. 8 TCD Cell (GC-8APT)
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