FID SPIKES

Hi all,

I am using a GC 6890 with split/splitless inlet to analyse reaction products. However, a problem has recently happened when the GC is running.

I have noticed the appearance of spikes in the baseline of the FID detector. The spikes appear occasionally. (See pictures below). The pictures attached correspond to the same experiment. As you can see the spikes occur before or even at the retention times where the analytes elute (between 13 and 15 min).

I also noticed, that when I turned of the FID, the signal reading is not 0, but a value around 0.76 and keeps oscillating,

Closer look to the signal when FID is off:

Aside from this (and maybe related to) the peaks are eluting 1-1.5 minutes earlier for the FID.

Any suggestions on what to look at?

Regads,

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0 valentinrusu over 6 years ago

Following up on James' response, I would agree and also add that you might want to run the FID checkout sample. The purpose would be to see if the response you get, both in terms of peak shape and peak area, is comparable to the checkout chromatogram (usually this is included with the checkout sample, but should also be in your operation and installation manuals).
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0 valentinrusu over 6 years ago

Following up on James' response, I would agree and also add that you might want to run the FID checkout sample. The purpose would be to see if the response you get, both in terms of peak shape and peak area, is comparable to the checkout chromatogram (usually this is included with the checkout sample, but should also be in your operation and installation manuals).
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