Tcd Pneumatics; Tcd Carrier, Reference, And Makeup Gas - Agilent Technologies 7890 Series Advanced Operation Manual

5
Detectors

TCD pneumatics

Makeup Reference Gas
Frit Frit
PS = Pressure Sensor

TCD carrier, reference, and makeup gas

176
This is the pneumatics design of the TCD.
Valve EPC Module
PS
Restrictor
Valve
PS
Restrictor
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.
Vent
Reference
switching valve
Column
Advanced Operation Manual