Inlets 3
Advanced User Guide 25
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.
There are three ways to begin Pre Run—manually (press [Prep
Run] before each run on the GC keypad or software keypad),
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 Run light blinks on the GC, and the Pre Run indicator
lights on the software keypad.
• Setpoints change to the correct values for injection.
• Inlet, detector, and oven equilibration times begin.
When all criteria for a run are met, the Not Ready light turns off.
The GC is now ready for sample injection.
The [Prep Run] key
Press [Prep Run] before you inject a sample manually. The GC
enters the Pre Run state. When the Run light stops blinking and
the Not Ready light goes off, begin the analysis.
Agilent samplers
If you are using an Agilent automatic sampling system, the
[Prep Run] function is automatic.
Start the sampler. It generates the [Prep Run] function, When all
the setpoints are reached and the GC becomes Ready, sample
injection begins.
NOTE
Gas saver and pressure pulse mode are not supported on EPR (electronic
pneumatics regulation) equipped GCs.
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