INFICON Explorer Portable Gas Chromatograph - Manual (Page 171)

Explorer Operator Manual
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4. Ensure Loop is selected and enter the desired Pump Time .
5. Click OK to accept the changes and close the dialog boxes.
The change you have made applies to the currently selected column only. If
you need to change the setting for another column, select the next column and
change the pump time.
6. Save the assay.
Injection Type
Samples can be introduced by automatic loop injection or by manual syringe
injection. If you select loop injection you must also set an injection time. Injection
time determines how long the loop will be in line with the column and in turn what
volume will be injected onto the column. The injected volume will also depend on
the flow rate. For example, setting the injection time to 10 seconds, at a pressure of
15 psi, will inject the entire contents of the sample loop onto the column.
Explorer is a very sensitive instrument. It is easy to overload the column and
detector by injecting a sample that is too large. Normally, you will set the
injection time to between 0.4 and 2 seconds. The flow rate and injection time will
determine the volume of sample injected from the 0.5 ml sample loop.
Explorer is not designed to accept liquid injections, so water samples are
analyzed using the headspace above standards. You may obtain commercially
prepared standards or you can prepare the headspace standards.
CAUTION
Do not inject liquid samples into Explorer or you will damage it.