Jennifer,

Do you get the decreased sensitivity on both the conflo and the gas bench? 
If so, then it is likely a problem with the mass spec itself, not the 
peripherals. Could be the pumping or the source tuning....

Paul Eby
University of Victoria

At 06:03 AM 22/08/2005, you wrote:
>Hi All,
>         I have a Delta plus with a gas bench and conflo.  I recently had 
> a sudden decrease in sensitivity (10x less sensitivity than normal).  I 
> checked the reference gases, conflo, gas bench, and source tuning.  They 
> were all fine.  I then replaced the filament and got the same 
> result.  The source should not be that dirty, it was last cleaned 8 
> months ago.  What else should I be checking?
>
>
>Jennifer Eikenberry
>Assistant Research Scientist
>Michigan Technological University
>School of Forest Resources and Environmental Science
>1400 Townsend Drive
>Houghton, Michigan 49931
>Phone 906-487-1774
>FAX 906-487-2915