40 Operation Manual
4 Methods and Sequences
Creating Methods
A method is the group of setpoints needed to run a single
sample on the GC, such as oven temperature programs,
pressure programs, inlet temperatures, sampler parameters,
and so forth. A method is created by saving a group of
setpoints as a numbered method using the [Store] key.
The GC also can store several specialized methods. The GC
stores three methods used for resource conservation, called
SLEEP, CONDITION, and WAKE. When configured for use with
an attached MS, the GC also provides a method called MS
VENT, used to change GC setpoints to values appropriate for
a safe MS venting process. See “Early Maintenance Feedback”
on page 119 and “GC- MS Features” on page 131 for more
information about these specialized methods.
Components for which setpoint parameters can be stored are
shown in Table 2.
The GC also saves ALS setpoints.
• See the 7693A Installation, Operation, and Maintenance
manual for details on its setpoints.
• See 7650 Installation, Operation, and Maintenance manual
for details on its setpoints.
• Operating the 7683B ALS on a 7890 Series GC manual for
details on its setpoints.
Current setpoint parameters are saved when the GC is
turned off, and loaded when you turn the instrument back
on.
Table 2 Setpoint parameter components
Component Component
Oven Aux temp
Valve 1–8 Aux EPC
Front and back inlet Aux column
Columns 1 to 6 Aux detector 1 and 2
Front and back detector Post run
Analog 1 and 2 Run table
Front and back injector Sample tray
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