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controlling needle depth in GC vial
Posted: Tue Mar 17, 2015 10:52 am
by 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
Re: controlling needle depth in GC vial
Posted: Tue Mar 17, 2015 1:17 pm
by muGC
What is your make and model of your GC?
Re: controlling needle depth in GC vial
Posted: Tue Mar 17, 2015 2:11 pm
by 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.
Re: controlling needle depth in GC vial
Posted: Tue Mar 17, 2015 2:22 pm
by MasdarIST
thank you for the reply. Its Agilent's 7890 A GC controlled by chemstation.
Re: controlling needle depth in GC vial
Posted: Tue Mar 17, 2015 6:19 pm
by 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.
Re: controlling needle depth in GC vial
Posted: Wed Mar 18, 2015 7:47 am
by MasdarIST
thank you very much. It's very helpful.