Agilent Technologies 7820A Advanced User's Guide

Detectors 5
Advanced User Guide 73
TCD pneumatics
The figure below shows 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.
Vent
Reference
switching valve
Column
PS = Pressure Sensor
PSPS
EPC/EPR Module
Makeup
Reference gas
FritFrit
PS
Valve
Frit
Valve
Frit
Valve
Frit

Agilent Technologies 7820A Specifications

General

Brand	Agilent Technologies
Model	7820A
Category	Laboratory Equipment
Language	English