20 Advanced Operation
2 How the 7697A Headspace Sampler Works
Fill with constant volume
In this mode, the HS pressurizes the sample vial with a
specified volume of carrier gas, then maintains the resultant
pressure for the specified hold time. This mode is useful if
you need to calculate the exact molar amounts of sample
and carrier gas in the vial or sample loop.
Dynamic leak check
By default, the HS performs a leak check after the vial
pressurization. While on the probe, the HS can determine if
the vial is leaking. If the HS must continually add gas to
maintain the desired pressure in the vial, then the vial is
leaking. The HS logs the leak test results, and provides a
sequence action to allow you to handle (for example, skip or
abort) a leaking sample vial. See “Sequence Actions”.
The time spent on dynamic leak test is equal to Pressure
Equilibration Time + .02 minutes.
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