Hello Huiming,
usually pfeiffer turbo pumps, controlled by a pfeiffer unit, have a standby
mode which let them run @
70% of their nominal speed. I don't know if the controller board of a 253 will
permit such mode, may be.
The other problem may be a leak issue in your MS,
enough to prevent your turbo pump reaching the maximum speed but not
enough to put your MS in save mode.
joel
A 08:59 11/01/2005 +0100, Deborah Rupprecht a écrit :
>Hello Huiming,
> if the pumps did not stop working because of some (un)sceduled power
>outages, maybe a board or board unit was damaged ?
>
>Best regards and good luck,
> Deborah
>
>
>At 16:16 10.01.2005 -0600, you wrote:
> >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/
> >
>
>*****************************************
>* *
>* Deborah Rupprecht *
>* Institut für Pflanzenernährung *
>* Rhein. Friedrich-Wilhelms-Universität *
>* Karlrobert-Kreiten-Str. 13 *
>* 53115 Bonn *
>* *
>* Tel. +49 -(0)228 -73 -3640 *
>* *
>*****************************************
*************************************************************************
Joel Savarino
Laboratoire de Glaciologie et Géophysique de l'Environnement/CNRS/UJF
54 rue Moliere, BP 96
38 402 St Martin d'Hères Cedex
France
tel: + 33 476 82 42 51
fax: + 33 476 82 42 01
Email: [log in to unmask]
Web: http://www-lgge.obs.ujf-grenoble.fr
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