INFICON Explorer Portable Gas Chromatograph - Manual (Page 70)

Explorer Operator Manual
68
Loop Injection Analysis
The instrument will be set up according to the method loaded on your instrument.
You can use a PC and the SiteChart software to load another method.
Selecting the Injection Method
Explorer can accept both manual syringe and automatic sample loop injections. You
must calibrate using the same injection technique as your sample. If you are using
automatic loop injection for sampling, calibrate using loop injection. If you are using
syringe injection for sampling, calibrate using syringe injection.
To select the injection method:
1. Press Enter Menu, then SETUP, MODE, and INJECT.
2. Press LOOP and press Enter Menu to set the option and to close the menu.
The sampling method will be indicated in the status line as LP to indicate a
loop injection or PRB to indicate a loop injection through either the long probe
or the extended probe.
Performing a Loop Injection Analysis
1. Ensure carrier gas is supplied to the instrument.
2. Ensure the plugs have been removed from the following ports: Detector 1 and 2
out, pump out and vent out.
3. Monitor the offset level in the status display box.
If it is above 800 mV or if the offset level is falling, allow the instrument to
stabilize for about an hour. If this does not bring the signal down, flush the
column for a few hours or overnight, as described in Flushing the Columns
starting on page 250.