controlling needle depth in GC vial

[MasdarIST]

Hi Guys,

I am wondering how to control the depth of the needle in the GC vial so that smaller volumes (less than 0.5 ml) can injected using standard 2 ml GC vial. For the time being we dont have the micro insert so any suggestion about lowering the needle depth would be appreciated.


Beel

[muGC]

What is your make and model of your GC?

[fsistere]

In many softwares you can programe the depth of the needle. We need your software to help you. I work with chemstation and galaxie.

[MasdarIST]

thank you for the reply. Its Agilent's 7890 A GC controlled by chemstation.

[muGC]

Go to your GC parameters and the ALS tab. Click the ">>" button to get the extra ALS parameters. The option you want is "Sample Depth". 0 mm is the default. It can be set from -2mm (below) to 30mm (above). Note that -2mm is nearly touching the bottom of the vial, so the default sample depth is very low in the vial.

[MasdarIST]

thank you very much. It's very helpful.