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TPH-distorted peaks
Posted: Sat Oct 19, 2013 4:08 pm
by pueblito
Dear Chromatographers.
We have some problems with an Agilent 6890N ( FID, software version B.04.02 SP1 (212)), that we use for TPH analysis.
The run starts at 40°C, but from time to time the sample is injected many degrees before (around 75°C) the initial temperature.
Any Idea about what is happening?
Thank you.
Re: TPH-distorted peaks
Posted: Sat Oct 19, 2013 8:42 pm
by Don_Hilton
Sonunds like you have an autosampler that is not waiting for the system ready siganl. What kind of autosampler do you have?
Re: TPH-distorted peaks
Posted: Mon Oct 21, 2013 3:49 pm
by pueblito
Dear Don.
These are:
7683 ( G2614A) autosampler.
7683B (G2913A) autoinjector.
Re: TPH-distorted peaks
Posted: Tue Oct 22, 2013 3:03 am
by Don_Hilton
I assume that is is an injection that is to be made when the GC reaches the ready status? And you are using ChemStation or MassHunter?
Don
Re: TPH-distorted peaks
Posted: Tue Oct 22, 2013 1:47 pm
by pueblito
That is right, the injection starts when the GC reaches the ready status, and it is a GC-ChemStation software.
Re: TPH-distorted peaks
Posted: Tue Oct 22, 2013 2:25 pm
by Peter Apps
Isn't there a setting somewhere that tells the automation whether to wait for the GC to be ready ? If there is you probably have it set wrong.
Peter
Re: TPH-distorted peaks
Posted: Tue Oct 22, 2013 3:11 pm
by Steve Reimer
If it is intermittent, then check the cable connections. Somewhere you are getting a start or ready signal before the GC is ready.
Re: TPH-distorted peaks
Posted: Wed Oct 23, 2013 11:49 pm
by pueblito
Thank you all for your help.
Best regards.