Flow and Pressure Control Part 1. Electronic Pneumatic Control (EPC)
Configure the column
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Configure the column
You define (configure) a capillary column by entering its length, diameter, and
film thickness. 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 of the four flow modes (discussed soon). If the column is not
defined, your choices are limited and vary depending on the inlet.
The rest of this chapter assumes that you have a split/splitless capillary column
inlet. If you have a different inlet, the discussion still applies but some details
differ. The procedures used as illustrations in the rest of this chapter are
somewhat simplified, because they show the most common ways to do things
but not all the alternatives. For the full details, see the Inlets and Detectors
volumes.
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