26 Advanced Operation
2 How the 7697A Headspace Sampler Works
How the HS Reduces Carryover
The 7697A HS provides two special features to reduce
carryover.
• After each vial, the HS purges the sample loop and
sample probe with a high flow of vial pressurization gas,
as defined in the method. This is called the Purge flow,
and you control both the flow rate and purge time.
• Between each sequence, the HS purges the sample loop
and sample probe with a continuous, low flow of vial
pressurization gas. This is called the Standby flow. You can
control the flow rate.
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