50 Operation
6 Methods
What Is a Method?
A method is the collection of setpoints needed for the
headspace sampler to prepare a sample and inject it into the
gas chromatograph. The Agilent 7697A Headspace Sampler
can store up to 32 methods internally, plus several built- in
methods. The primary parts of the method control the
parameters for:
• Temperatures for the vial, sample loop, and transfer line
•Times for equilibration and injection, plus the GC cycle
time (used for sample overlap and throughput
calculations)
•Vial settings for vial size, filling, shaking, and venting
after the injection
•Carrier gas settings, for controlling carrier gas flows
during the injection and GC run (if using the optional
EPC module)
The parameters available depend on the instrument model
and current configuration. For complete details about all
possible method parameters, see the Advanced Operation
Guide.
Built-in methods
In addition to the 32 user- definable methods, the HS also
stores 6 special methods:
Method Comments
Default A basic method, useful as a basis for new methods. Not
editable.
Checkout The parameters needed for initial performance
verification. Not editable.
Qualification The parameters needed for Agilent’s performance
verification and qualification service. Not editable.
MeOH in H2O Basic starting parameters for analyzing methanol in
water. Not editable.
Sleep Use the Sleep method to load settings for periods of
inactivity. The sleep method is editable. To schedule the
instrument to load the sleep method at a given time of
day, see the Advanced Operation Guide.
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