Page 6 - Shimadzu GC-8A

Detectors

Thermal Conductivity Detector (GC-8AIT, GC-8APT)

Highly stable and sensitive filaments
The rhenium-tungsten filaments, each of which has a resistance
of 100Ω, ensure the highest sensitivity and stability.

Carrier gas
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

Filament protection Fig. 8 TCD Cell (GC-8APT)

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 Collector electrode
detector to extremely low levels.
Quartz jet
High voltage electrode
On-detector system
Air
The dead space is eliminated at the connection of the column
H2
and the detector. Excellent repeatability is provided even in
analysis of trace components.

External igniter Column

The flame igniter is mounted external to the detector to
significantly reduce wire damage due to corrosive combustion Carrier gas
components and to make replacement of the igniter filament
Fig. 9 FID Cell
cheap and simple.

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