Jennifer,

Check the Conflo capillaries to see if any have slipped from their ferrules.
Check the inlet capillary first.  Your Finnigan manuals should list 
adjustment recs.
Proper placement for those guys is critical.   Movement/slippage on those
has caused sudden sensitivity changes for us in the past.

Best,
Tom


Thomas R. Maddox
Analytical Chemistry Laboratory
Institute of Ecology, UGA


----- Original Message ----- 
From: "Jennifer Eikenberry" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, August 22, 2005 9:03 AM
Subject: [ISOGEOCHEM] Delta plus - low signal


> 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
>