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3 Installing Packed Columns and Setting Analytical Flow Lines
3.4
3.
GC-2014
3.4Packed TCD Analysis
Connecting the left (L) sides and right (R) sides of the dual INJ and TCD with columns
respectively allows for analysis with the dual-column configuration.
Dual-column configuration is used in following cases.
1. Almost equal columns are connected on the left and right sides to balance TCD's zero
point for analysis.
2. Different types of columns are connected to the left and right sides in order to obtain a
different chromatogram when a sample is injected to the L and R of the dual INJ.
1. Do not cross the columns (L/R). It hinders correct analysis.
2. If left and right columns are extremely different (e.g. liquid quantity, flow rate), zero point may not be
achieved by turning the control on the right side of the GC unit. In this case, adjust the column flow
rate on the side that a sample is not analyzed (reference side).
Fig. 3.4.1 Dual-column configuration (TCD)
CAUTION
1.Carrier 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.During analysis with a single column, connect a pipe to the other
flow path instead of a column and feed carrier gas.
Column (L) Column (R)
L
(L) (R)
Dual INJ
R
Dual AFC
TCD
L
R
NOTE
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