Flow and Pressure Modules 2
Advanced Operation Manual 31
Channel 1: Forward-pressure only
This is identical to the carrier gas channel for the packed
column inlet.
Channel 2: Two-way channel
If gas is supplied at the threaded connection and delivered
by the tubing, this operates the same as channel 1. But the
connections can be reversed—requiring some fittings—so that
it will maintain the gas supplied to it at a fixed pressure. In
this mode it behaves as a controlled leak.
This can be used to maintain the gas in a gas sampling valve
at a fixed pressure, even if the supply varies somewhat. The
result is improved reproducibility in sample amount.
The figure shows the connections with the valve in the Load
position.
Valve
PS
Sample in
Carrier in
To c ol umn
Back-pressure regulation
Sample out
Vent
connection
Threaded
connection
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