154 Operation Manual
10 Configuration
You should check configurations for all columns to verify
that they specify the correct pressure control device at each
end. The GC uses this information to determine the flow
path of the carrier gas. Only configure columns that are in
current use in your GC’s carrier gas flow path. Unused
columns configured with the same pressure control device as
a column in the current flow path cause incorrect flow
results.
It is possible, and sometimes appropriate, to configure both
installed columns to the same inlet.
When splitters or unions exist in the carrier gas flow path,
without a GC’s pressure control device monitoring the
common junction point, the individual column flows cannot
be controlled directly by the GC. The GC can only control
the inlet pressure of the upstream column whose inlet end is
attached to a GC’s pressure control device. A column flow
calculator available from Agilent, and provided with Agilent
capillary flow devices, is used for determining pressures and
flows at this type of junction.
Some pneumatic setpoints change with oven temperature
because of changes in column resistance and in gas viscosity.
This may confuse users who observe pneumatics setpoints
changing when their oven temperature changes. However, the
flow condition in the column remains as specified by the
column mode (constant flow or pressure, ramped flow or
pressure) and the initial setpoint values.
To view a summary of column connections
To view a summary of column connections, press
[Config][Aux Col #], then press [Enter]. The GC lists the column
connections, for example:
COLUMN CONFIGURATION SUMMARY
Front Inlet -> Column 1
Column 1 -> Front detector
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