Chromatography Forum

Posted: **Thu May 23, 2013 7:41 pm**

Dear all,

I'm using an FID and I cannot understand why my air and hydrogen flow sets to "OFF" just at the end of the run, then instantly go to the set flow.

I've been using a GC before but with this new one I'm having this problem. I feel that it is not a problem with pressures (because the flow setpoint goes to OFF, doesn't decrease) but with something set on the method/sequence.

Any idea?

Thanks in advance,

Posted: **Fri May 24, 2013 12:31 am**

We will have to know your instrument. If it Agilent I would check your lit offset value.

Posted: **Fri May 24, 2013 5:47 am**

The instrument is Agilent 6890.
Thanks.

Posted: **Sat May 25, 2013 2:07 pm**

Dear all,

I managed to avoid the problem I described previously. It was just a problem with the movement of a valve. It was being switched too soon.

Thanks,

Chromatography Forum

Air+ H2 OFF after run, instantly ON afterwards. Why??

Air+ H2 OFF after run, instantly ON afterwards. Why??

Re: Air+ H2 OFF after run, instantly ON afterwards. Why??

Re: Air+ H2 OFF after run, instantly ON afterwards. Why??

Re: Air+ H2 OFF after run, instantly ON afterwards. Why??