Hi all,
I have a 6890A GC with a FID. We recently acquired the instrument and I have been running standards up to test methods. I have been getting signals that seem suspiciously low.
I am injecting Matreya Bacterial CP FAME mix (C11-C20 methyl esters…
It looks like theres a problem with the back inlet/back autosampler - the gc does not recognize it anymore - but it seems to be defined within the method, meaning it has a inlet temperature ect.
Did you change something regarding the back inlet? or…
Hi
Either there is leak or loop is not filling properly with sample for low area.
And for too hot transferline, may be PC board or sensor is malfunctioning or faulty of headspace.
You can change column or trim the column from inlet and detector…
Hi Mohammad, Thanks for your thought, detector temperature is not extremely high or low. I did monitor temperature for FID and inlet the whole time even during the injection. It was stable and maintained for hours/days. Method that I was using I had checked…
Hi Brian,
What kind of detector are you using? From my experience with FID, you shouldn’t have issues with septa bleed from re-running samples within the same day. If you inject the vial and then re-run it after a day, you will probably see n-hydrocarbon…
While running oils and extracts on GC,the basline shows wandering as in the attached photo below in the range from 75 to 100 mins.The problem is not related to specific temperature because it appears at the beginning of the run,middle and at the end in…
Hello everyone,
I have a 8890 GC-FID that I've just started running.
I want to create a "shut down" method that turns off (or lowers) H2 and Air once a run is completed or that can uploaded at the end of the day. The goal here is to keep the instrument…
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