Chromatography Forum

Hi all
we have Agilent GC 6890N. Recently PM was performed by Agilent Service eng. After the Nanoliter adapter feature has disappeared. It is very important for us asour GC is controlled by Empower, if this Nanoliter adpter is not set to off in GC, it is not posible to inject exact injection volume that is specified in sample set, GC is injecting only 0.2 Microliter instead of 1.0microliter., can anybody help

Get the so-called service engineer back in again.

Peter

First - do what Peter said.

If you have an urgent need to run samples between now and when the engineer gets in, a possible workaround:

The Agilent autosamplers count stops along a guide - the first being the 0.2 uL stop, the second the 1 uL stop. You may be able to set your method to call for the next larger volume (which - off the top of my head - is 2 uL). If I am right, the autosampler will count clicks and go to the second stop - which for you will be 1 uL.

If you try this, stand and watch the plunger draw a sample to be sure you are getting 1 uL. Do not assume that I am correct. This is from memories of when the first autsamplers with nanoliter adapters came out and we were having to match autosamlers and software.

While this can get you some analyses while you wait - it makes a mess of your method documentation. If this works, do not allow it to become the permanant fix.

I know my response is a bit late, but hey...
Try turning the GC power off then back on. I suspect you are using Empower2. There is something in the way it interacts with Agilent GC's that make the function "disappear". Once the GC comes back up, the function should be there again. Set it to what you need to be before you connect to Empower. It will "disappear" again when the GC is reconnected to Empower; however it will remain on or off (however you set it) and functioning that way.