Page 1 of 1
Two detectors giving different area counts
Posted: Sat Feb 04, 2006 6:44 pm
by munda26
Hi, my Varian 3600 GC with Star software was working good till a unathorized tech. came to fix problem with autosampler. Now I am getting different responses from two FID detectors. Under same conditions and methods for both, Detector A gives area counts same as before while detector B area counts are about 10 times higher than that for Detector A. What would have been changed.? Any help and suggestions would be appreciated.
10X
Posted: Mon Feb 06, 2006 1:46 pm
by chromatographer1
I would check the amplifier setting for each detector or the connections from the instrument into your data system. Sounds like a 1V output was changed to a 10V output.
Leaks?
Posted: Wed Feb 08, 2006 6:38 pm
by pkariher
I would add that if they had the same respnose before the autosampler tech worked on the unit, something happened to the autosampler.
Check for leaks if this is a purge and trap.
Check to see that the autosamplers are delivering the same amounts.
Can you make a manual injection?
Did you check the FID flows?