Hello all,

In the past upon opening the isolation valve to the Costech AS, the 
carrier pressure (~0.85 bar) would climb to match the purge pressure 
(~1.5 bar).

Today on the first round of samples that took a long time to happen. On 
the second round it did not get there, reaching only 1.3 bar. We then 
observe in standards an attendant shift to heavier values.

What might cause this, and what is the potential solution? We suspect a 
leak, but where is likeliest place?

Thanks,
-Jim
-- 
Jim Palandri
Research Associate
Department of Earth Sciences
1272 University of Oregon
Eugene, OR 97403-1272