160 Operation Manual
10 Configuration
Composite Columns
A composite column is a capillary column that passes
through multiple heating zones. A composite column consists
of a main segment and one or more additional segments.
There may be one segment on the input side of the main
segment (In Segment) and up to two segments on its output
side (Out Segment, Segment 2). Each of the four segments'
lengths, diameters, and film thicknesses can be specified
separately. Also, the zones that determine the temperatures
of each of the four segments are specified separately. The
three additional segments are often uncoated (zero film
thickness) and, serving as connectors, are of shorter length
than the main segment. It is necessary to specify these
additional segments so that the flow- pressure relationship
for the composite column can be determined.
Composite columns differ from multiple columns because for
composite columns, 100% of the column flow continues
through a single column or through multiple column
segments without additional makeup gas.
Analytical column
GC Inlet Detector
MSD
Transfer Line
In segment
Out segment
Segment 2
Transfer Line
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