Chromatography Forum

We have an Angilent G1888A autosampler that is randomly skipping vials during a programmed run. When it skips 1 or 2 vials, it knows which vial it is running. Example: If the run is set for vials 1-8, and it skips vial 4, it displays vial 5 when it is collecting the sample. It just skips 4, or the next run it might be vial 3 or 6 or 2and3. I don't see a pattern.
Does anyone have a suggestion for this issue?
Thank You
Gary Nelms

Might be sequence related if you reuse sequences.

If you reuse, make a new sequence and test.

So might be software related rather than the autosampler/HS.

Check that your sample equilibrium time is a not a multiple of your GC cycle time. If it is then sooner or later the instrument will be trying to inject from one sample and start the equilibrium on another at the same time. I have only seen this cause the system to hang, but it might also make it skip a vial. Does it drop the skipped vial into the oven ?

Peter

Hi Bone,

I could be sequence problem, Once you download new sequence, just check vials number in sequence for specific sample, correct the vial number of specific sample, I will work fine

Regards
Akbar