4 Installing Capillary Columns and Setting Analytical Flow Lines
4.4
4.
54
GC-2014
4.4Capillary TCD Analysis
To perform capillary analysis using a unit with the TCD, makeup gas needs to be supplied to
the TCD joint that a column is connected to and carrier gas (called reference gas) also
needs to be supplied to the TCD joint that a column is not connected.
In order to supply makeup gas, install the detector adapter with purge (P/N 221-34012-91) to
the TCD joint. Connect the purge piping of the adapter to the dual INJ so that makeup gas is
supplied from the dual AFC through the dual INJ.
(The dual AFC is off the line and operates as an independent mass flow controller.)
Reference gas is supplied from the dual AFC when the dual INJ and TCD are connected
with a MF-MF joint.
The figure above shows an example where makeup gas and reference gas are connected to
the left (L) and right (R) sides of the dual INJ respectively and a column and reference gas
piping are connected to the left (L) and right (R) sides of the TCD respectively. They can be
connected to either side (L/R).
Fig. 4.4.1 Capillary TCD
CAUTION
1.Carrier gas (makeup gas and reference gas) has to be fed to both
of left and right (L/R) sides of the TCD. Using the TCD without
carrier gas will damage the filament.
2.When makeup gas and reference gas are supplied from the dual
AFC, TCD filament's protection mechanism does not work even if
an error occurs.
MF-MF
piping
LR
Column
Detector
adapter
with purge
TCD
L
(L) (R)
Dual INJ
R
Dual AFC
SPL
AFC
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