222 Advanced Operation Manual
6 Valves
Use a run table entry to ensure that the valve is in the Off
state between runs.
Gas sampling valve
If a valve is configured as a gas sampling valve, it starts a
run automatically when it is switched to the Inject position.
This can be done with a keyboard command or by a
subsequence or clock table entry. You may have two gas
sampling valves installed.
Load position The loop is flushed with a stream of the
sample gas. The column is flushed with carrier gas.
Inject position The filled loop is inserted into the carrier gas
stream. The sample is flushed onto the column. The run
starts automatically.
Carrier gas may be provided by an (optional) auxiliary gas
channel. To do this, configure the column and specify an
Aux # channel as the inlet. The channel then becomes
programmable with four operating modes.
Sampling valves have two positions:
Load position The loop (external for gas sampling, internal
for liquid sampling) is flushed with a stream of the sample.
The column is flushed with carrier gas.
Inject position The filled loop is inserted into the carrier gas
stream. The sample is flushed onto the column. The run
starts automatically.
The sampling valve control parameters are:
Carrier in
To c ol umn
Sample in
Sample out
LOAD position INJECT position
Loop
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