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)

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

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.

Thank you for confirning.