Pat, I spoke with CE about this and they replumbed the 2500 to purge with O2 so as not to use as much He.? Go figure? bill At 01:45 PM 4/29/99 -0500, you wrote: >Bill, >Are you sure the oxygen is plumbed right. I can't imagine why you would >purge the autosampler with expensive oxygen. > >Pat > >-- > >Patrick D. Anderson >Researcher >Great Lakes WATER Institute >Univ. of Wisconsin-Milwaukee >600 E. Greenfield Ave. >Milwaukee, WI 53204 >Phone: 414-382-1731 >