5Methods
76 Operation Manual
Running Methods
Pre Run and Prep Run
With some inlets and operating modes, certain instrument setpoints are different between
runs than during an analysis. To restore the setpoints for injection, you must place the GC into
the Pre Run state.
You must use the Pre Run state when:
• Using gas saver with any inlet.
• Using splitless mode with any inlet.
• Using a pressure pulse mode with any inlet.
• Using the solvent vent mode of the PTV inlet.
• Using the direct or splitless mode of the Volatiles Interface.
• Using the solvent vent mode of the MMI inlet.
• Using the direct mode of the MMI inlet.
There are three ways to begin Pre Run—manually (select before each run), automatically
(for Agilent samplers), or using Auto Prep Run (for non-Agilent samplers). The three methods
are discussed below.
During the Pre Run state:
• The status on the touchscreen changes to indicate the GC is preparing for the injection.
• Setpoints change to the correct values for injection.
• Inlet, detector, and oven equilibration times begin.
When all criteria for a run are met, the Status/Control tray indicates that the GC is ready for
sample injection.
Manually prepare for the run
Select before you inject a sample manually. The GC enters the Pre Run state. When the
touchscreen indicates that the GC is ready, begin the analysis.
If you are using an Agilent automatic sampling system, the Prep Run function is automatic.
Non-Agilent samplers
With most automatic injection systems, you do not need to use the button. If your sampler
or automation controller (for example, an integrator or workstation) does not support the Prep
Run function, you must set the GC to Auto Prep Run.
To manually inject a sample with a syringe and start a
run
1 Prepare the sample syringe for injection.
2 Load the desired method. See “Load a Method”.
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