I have local sources for helium balloons that use actual helium, not "ballo=
on gas" so I pay about $1 for 2 or so liters of gas in a convenient disposa=
ble container.
I don't need pressure, I'm always pulling the gas anyway.  =20
My Neon and Argon come in glass flasks for $70/2l
Still working on a cost effective source for Xenon.

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 Sean Breheny
Sent: Friday, November 3, 2017 10:02 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Vacuum plumbing

Is there any reason you don't use argon as your rinse gas? It's much cheape=
r.

On Fri, Nov 3, 2017 at 11:15 AM, Van Horn, David < david.vanhorn@backcountr=
yaccess.com> wrote:

> Fortunately my only use for helium is as a rinse gas.  Vac the system,=20
> fill with He, then vac it again, and call it clean.  :)
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On=20
> 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=20
> sealing helium over a temperature range, it is very much a black art.
>
> Thankfully I'm only involved in the electricals ...
>
>
>
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