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Running a Sample
To run a sample, perform the following:
1. If the transfer line is not connected to the GC, connect it.
• If using a needle through the septum, see your installation manual.
• If using a volatiles interface, see page 96.
2. Check your gas supplies to make sure you have sufficient gas available for
all your analyses.
3. Set the flow and pressures for the headspace sampler. See page 78.
4. Set the GC conditions. See your GC operating manual.
5. Load the method or set the method chain you want to use. See page 64 or
page 65.
6. Prepare the samples. See 5Preparing a Sample.
7. Load the samples into the tray (G1289/G1290) or carousel (G1883). See
page 58.
8. When the GC and HS are ready, press Start.
Setting Conditions
Flow Rates
Refer to your GC operating manual for details about its flow systems.
Two distinct versions of the 7694 Headspace Sampler exist. Models G1883 and
G1290 are supplied with mechanical pneumatic controls; model G1289 is
designed for use with a GC with EPC control, and so it contains no pressure
regulator or flow controller. The procedure for setting flow rates differs for
these two versions.
As a general rule, when you are setting flows for the headspace sampler, most
of the flow should come through the transfer line from the headspace sampler.
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