Fortunately my only use for helium is as a rinse gas.  Vac the system, fill=
 with He, then vac it again, and call it clean.  :)

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 alan.b.pearce@stfc.ac.uk
Sent: Friday, November 3, 2017 3:30 AM
To: piclist@mit.edu
Subject: RE: [EE] Vacuum plumbing

> I still wish I could find a book/document/etc that describes the=20
> building of a vacuum system for the range of 1 torr to 10 microns or so.
> Seems to be a black art.

Judging by the difficulties a program I am working on is having sealing hel=
ium over a temperature range, it is very much a black art.

Thankfully I'm only involved in the electricals ...



--
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang=
e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis=
t

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.