Chromatography Forum

Hi everybody!

I'm working with Trace GC Trace DSQ GC/MS. Now I have the following problem : when I want to do autotune one messege appear "cannot perform detector gain calibration" !!!
From the previous tune file detector gain voltage is 1095V, so it's not to high!
When I ran the diagnostic tests everything is OK!
Air/water spectrum is OK
I performed leak check (Column evaluation) - OK!

I suppose taht may be the reason is sumthing wrong in the connection between PC and the MS, but how to be shure???

Have you tried to change your "ion-volume". If we have this problem it's usually either a dirty ion-volume or a dirty source.

Kevin

I have already asked the technician form Thermo and he told me the same : dirty ion volume or not enough calibrant!
But thank you very much for your reply!

Isn't Thermo grand??

I've got the same equipment and have had the same problem awhile back. Unfortunatly I don't remember exactly what it took to fix it. Right now I can't seem to perform mass calibration.

Have you ran a tune with out doing detector gain calibration? If not try that. If you did, did it pass? Perhaps if you can get all the tune to pass first then run detector gain it will work.

Jeremy