Paul,
May I suggest that you try a zero test with 50 mbar or more of helium in
the bellows? Viscous flow may may be required to sweep the contamination
through the capillaries and into the source.
-joe
--
Joe Berry
Carnegie Institution of Washington
Department of Plant Biology
260 Panama St.
Stanford, CA 94305
650-325-1521 x221 (voice)
650-325-6857 (fax)
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