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You might try tightening the sulfur window bolts while tracing vacuum or
m/z 40.

andy

On Mon, Jul 16, 2018 at 12:16 AM Vadim N. Reutsky <[log in to unmask]>
wrote:

> Looks like a leak through a join. It closes when metal is hot and back
> again when it getting colder...
>
> Lukas Flierl писал 16-07-2018 13:08:
> > Dear all,
> >
> > We have some trouble with our MAT253. Normally the pressure is about
> > 5e-8 mbar but somehow over night it increased to 1.2e-7 mbar.
> > We did not change anything.
> > Here comes the strange thing about this error. We switched on the
> > analyzer and the source heater and the the pressure drops instantly to
> > 2e-8 mbar.
> > Switching off the heaters leads to a increase of the pressure again.
> > This is strange, shouldn't the pressure increase while heating and
> > decrease when the heaters are off?!
> > Has anybody encountered such a strange error? Is it a real leak or
> > some faulty electronics or something totally different?
> >
> > Greetings
> >
> > Lukas
> >
> > -----------------------------------------------------------------
> > Lukas Flierl
> > Physikalisch-Technische Bundesanstalt PTB
> > Metrology in Chemistry, 3.11
> > Bundesallee 100
> > 38116 Braunschweig, Germany
> > Tel. +49-531-592-3318
> > e-mail: [log in to unmask]
> > web: www.ptb.de
>
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Andrew Schauer
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