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


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:
Andrew Schauer
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