176 Advanced Operation Manual
5 Detectors
TCD pneumatics
This is the pneumatics design of the TCD.
TCD carrier, reference, and makeup gas
Reference and makeup gas must be the same as the carrier
gas, and the gas type must be specified in both the inlet and
detector parameter lists.
When using packed columns, we recommend a small makeup
gas flow (2 to 3 mL/min) to get the best peak shapes.
Use the next figure to select a value for reference gas flow
for either capillary or packed columns. Any ratio within
±0.25 of that in the figure is suitable.
PS = Pressure Sensor
Vent
PS
Valve
FritFrit
Reference
switching valve
Restrictor
EPC Module
Reference Gas
Makeup
PS
Restrictor
Valve
Column
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