Dear Ricardo,

I've similar experience as Li and Howard.
At my delta plus the pirani gauge was mounted in such a way that the gauge
pointed to the bottom, so the oil condensate accumulates there and destroyed
it over the time. If it is the same way at your delta plus my tip is to add
a angle before changing the pirane gauge -and I fear you have to- in such a
way that the pirani gauge points to the top to avoid coming in oil from the
rotary pump.

Franz

Ricardo De Pol Holz schrieb:

> Dear members,
>
> I have just changed my delta plus filament and reinstalled the Source. I
> also renew the seal gasket to avoid problems. When I started the pumps
> again, my Fore vacuum went only to 4.5e-1 mbar but that was enough to
> start the turbopumps. After 2 hours the fore vacuum lowered to 8.5e-1
> mbar but the high vacuum was in the good direction (2.5e-7 mbar). All
> leds at the front panel are "green" (on).
> Since I didn't manipulate any of the FV conections, I only opened the
> source I don't have any idea what could be happening...or perhaps it is
> normal after a source opening and I should only wait. It worries me a
> little because the rotary pump has the typical bubbling sound as if its
> recently started (but it usually desappeared after a little while before
> this problem).
>
> Plase...any hints are most welcome.
>
> Thanks a lot.
>
> Ricardo De Pol-Holz
> Universidad de Concepcion

--
Franz Buegger
Institute for Soil Ecology
GSF - National Research Center for Environment and Health
Ingolstaedter Landstr. 1
D-85764 Neuherberg/Germany

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