New to GC FID

Hi Revathy,

These are electronic noise spikes. Typically when you see a sharp spike with no area under the peak/ spike this is from the fid or fid electronics. The fid collector has a spring connection for the signal to the electrometer and dirt or corrosion can cause spikes like you are seeing. I would suggest taking the FID apart and cleaning the collector assy and changing the jet as a first step. I have attached a section from the 7890 manual that covers FID maintenance. The procedures in the manual apply to other Agilent GC models as well as the FID assemblies are all similar. I hope this helps.

Regards

James

Thank for that James.  Will try and let you know.

Regards

Revathy

Agree with electronic noise.  Additionally, opening and closing of the instrument lid can cause these sorts of spikes. 

Hello, spikes like that are usually coming from the detector, you can try what happen if you "tic" with a screw on a fid jokin, don't do that

In my lab we don't bother about noise like the one you show us in the picture, cause we set the signal windows between 0 and 50.

But if you need super flat baseline without spikes like that I suggest you to perform manteinance on the fid, especially installing the column perfectly.

Apart from the detector spikes, and to be picky, I would check also the gas purity and the inline carrier filters, because a 10 pA baseline is pretty high for our standard (we have a 3/4 pA baseline at oven 70°C)

Hi Revathy, 5 pA baseline to 6pA at 300°C is good.

I meant that my baseline is usually 3 pA or 4 pA, so its like yours, the FID is ok for our standard use.

Regards

Thanks Skuhl.  Now it is sorted out.