[3dem] pumping down liquid nitrogen dewars

[Andrzej Żak]

Hi Tobias,
There is bunch of different systems of such valves, they a bit differ in
sizes. The best way is to go to vacuum dewar company or local researchers
working in cryogenics or vacuum. The process of regeneration is not obvious
and take some time. I Poland in some of the Polish Academy of Science
institution I paid around 300-400euros for whole procedure for 80l tank,
including first filling and usage test.
Best wishes
Andrzej

Andrzej Żak
Wroclaw University of Science and Technology,
tel. (+48)883314999

czw., 22 lut 2024, 15:58 użytkownik Tobias Furstenhaupt <furstenh at mpi-cbg.de>
napisał:

> Dear colleagues,
>
> we have about 8 dewars to store our cryo samples. Some are rather old (10+
> years) and insulate badly (=large consumption of nitrogen).
> Each of the dewar has something that looks like a valve (see attached
> foto) to pump the vacuum between the two walls.
> Does anybody of you know the name of the corresponding connector and where
> to buy it (europe/US)?
>
> cheers
> Tobias
>
>
> -----------------------------------
> Tobias Fürstenhaupt, PhD
> head of Electron Microscopy
> Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG)
> Pfotenhauerstrasse 108
> 01307 Dresden, Germany
>
> mail: furstenh at mpi-cbg.de
> phone: (+49) (0)351 210-2690
> cell: (+49) (0)176 / 44498706 (NEW!)
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