How the 7697A Headspace Sampler Works 2
Advanced Operation 21
How the HS Fills the Sample Loop (Extracts a Sample)
After the vial is pressurized and has stabilized, the HS will
perform the specified extractions. The six port valve
switches, allowing the pressurized sample to vent through
the sample loop. After the specified conditions are met, the
loop is considered filled. See Figure 7 below.
Figure 7 Filling the sample loop
The HS provides two modes for filling the sample loop,
Default and Custom.
Default loop fill mode
In this case, the HS depressurizes the sample vial into the
sample loop at a specified rate until the sample vial
pressure drops a known amount. The HS calculates the final
loop pressure and equilibration time based on current HS
configuration and method data.
Custom loop fill mode
In this case, you can specify the loop fill rate, final loop
pressure, and equilibration time.
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Sample probe
Carrier gas Vent
Transfer
line
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