User guide

Configuration 2
Advanced User Guide 33
Column #
Length The length, in meters, of a capillary column. Enter 0 for
a packed column or if the length is not known.
Diameter The inside diameter, in millimeters, of a capillary
column. Enter 0 for a packed column.
Film thickness The thickness, in millimeters, of the stationary
phase for capillary columns.
Inlet Identifies the source of gas for the column.
Outlet Identifies the device into which the column effluent
flows.
Thermal zone Identifies the device that controls the
temperature of the column.
To configure a single column
You define a capillary column by entering its length, diameter,
and film thickness. You then enter the device controlling the
pressure at the Inlet (end of the column), the device controlling
the pressure at the column Outlet, and the Thermal zone that
controls its temperature.
With this information, the instrument can calculate the flow
through the column. This has great advantages when using
capillary columns because it becomes possible to:
• Enter split ratios directly and have the instrument calculate
and set the appropriate flow rates.
• Enter flow rate or head pressure or average linear velocity.
The instrument calculates the pressure needed to achieve the
flow rate or velocity, sets that, and reports all three values.
• Perform splitless injections with no need to measure gas
flows.
• Choose any column mode. If the column is not defined, your
choices are limited and vary depending on the inlet.