Dear folks:
I found my turbo pump unit (TMH 262 and TMH 071) on the analyzer
(MAT253) was off this morning. After   restarting, the turbo unit won't
be able to attain nominal rotation speed, which means that I won't be
able to check source pressure on the mass spec. The back pump (DUO 5.0)
are fine (pumping down to 10 ^ -5 torr). No leak on the line is
detected. A call to Pfeiffer did not seem to indicate that the turbo
pumps are broken. The turbo pumps have been pumping for 2.5 years, and I
don't expect their life is that short.

I know several scheduled and unscheduled power outages during the
holidays were partially to blame, but any suggestion how to fix the
problem will be appreciated.

Best,
Huiming

--
Huiming Bao, Assistant Professor
Department of Geology & Geophysics,
E235 Howe-Russell Geoscience Complex
Louisiana State University
Baton Rouge, LA 70803, USA
Tel: 225-578-3419 (office), -3413 (lab)
Fax: 225-578-2302
http://www.geol.lsu.edu/bao/