New to GC FID

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 Dmarchini

Thanks you for pointing it out about 10pA baseline.  The fig. which I sent it is at the end of the run(before maintainance).  Now my base line at the start of the run is 5.1 at 70°C and by the time it reaches max temp of about 300°C the pA is about 6 (is that good enough) and it stay stables there until the run finishes (21 min run).  What you mean is yours in <1pA(3/4) is that right.   We have new inline carrier filters so i guess that is not the problem.  Let me know if this baseline is good enough.  Thank you for your time.

Hi Dmarchini

Thanks you for pointing it out about 10pA baseline.  The fig. which I sent it is at the end of the run(before maintainance).  Now my base line at the start of the run is 5.1 at 70°C and by the time it reaches max temp of about 300°C the pA is about 6 (is that good enough) and it stay stables there until the run finishes (21 min run).  What you mean is yours in <1pA(3/4) is that right.   We have new inline carrier filters so i guess that is not the problem.  Let me know if this baseline is good enough.  Thank you for your time.

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

Thank you for confirning.