I second that commotion - regular helium gas has become expensive enough as is!
Cheers,
Neal
Neal J. Stolowich, Ph.D.
ULNMR Facilities Manager
Department of Chemistry
Office: 502 852 7894/Fax: 502 852 8149
-----Original Message-----
From: KENWRIGHT A.M. [mailto:a.m.kenwright_at_durham.ac.uk]
Sent: Friday, October 03, 2014 3:30 AM
To: Matthias Findeisen
Cc: Ammrl_at_ammrl.org
Subject: Re: AMMRL: Helium Gas Specification for Refilling Purpose
Hi Matthias,
Standard grade helium is fine. The helium gas goes into the delivery dewar rather than into your magnet. If you are going to start worrying about what goes into the delivery dewar then you also need to worry about what everyone else uses (over which you have no control). I have been using standard grade helium fro > 25 years with no problems (yet!)
Regards,
Alan
Alan Kenwright
Reader in Spectroscopy & NMR Service Manager Durham University Chemistry Department
On 2 Oct 2014, at 10:29, Matthias Findeisen <matthias.findeisen_at_uni-leipzig.de> wrote:
>
> Dear all,
>
> which Helium-Gas Cylinder do you use for refilling the magnet (i.e. to give slight pressure onto the refill dewar)?
>
> Is the specification of 99.996 % sufficient for this?
>
> Which experiences do you have?
>
> Thanks!
>
> Yours
> Matthias Findeisen
>
> Univ- Leipzig/ Germany
>
Received on Fri Oct 03 2014 - 08:22:57 MST