Chromatography Forum

Posted: **Thu Oct 16, 2008 11:18 am**

Hi all,
We're using an Agilent 5890 GC-FID for alcohol analysis. For the past few days we've been getting a baseline drop at around 10 minutes, which equates to about 100 degrees C on the temp programme we're using. We've tried hooking up a new air supply, in case the problem was moisture in our old air supply, but to no avail.

Has anyone any idea what could be causing this baseline drop and how we could fix it?

Posted: **Thu Oct 16, 2008 12:00 pm**

Hi Marge,

Did you try to clean the FID and cut a piece of the column part connected to the detector? It may help...

Regards,
At_om

Posted: **Sat Oct 18, 2008 4:27 pm**

Marge,

Can you post a chromatogram and instrumental conditions?

Best regards.

Posted: **Tue Nov 04, 2008 11:14 pm**

Check if the column nut at the detector side is snug properly , also check your flows to assure all flows for the FID are correct.

Posted: **Tue Nov 04, 2008 11:43 pm**

It might be worth noting if this baseline drop occurs at the time for a purge off time or gas saver coming on. (or some other event that happens in the run)

Chromatography Forum

Baseline drop in 5890 GC-FID

Baseline drop in 5890 GC-FID

Baseline problem