This is obviously of great interest to the group. The reason people like rubber hose is that it connects to the magnet easily. Of course this comes with the safety drawback that many have detailed. The steel braided lines that we have come with the flare fitting on both ends. The designation is CGA-295. You can also buy CGA 295 on one end and NPT on the other end. I note that CGA-295 to NPT adapters are less than $10.
In either case you (or your shop) should be able to build an adapter from the appropriate fitting to thin wall stainless tubing (5/16" OD on Oxford magnets) that will fit inside the LN2 port. Think of the J tube that used to come with Oxford magnets, only smaller OD. Thus you would have stainless and brass all the way from the LN2 Dewar to the magnet. I don't think it has to be a tight fit like you would get with rubber tubing, but the one I built does - an Ultra-Torr fitting that has an O-ring seal on the outside of the LN2 port. But this is probably overkill.
This design does require silver soldering because of the stainless. The use of different materials or adapters may get you out of that requirement. Have others done this differently? In any event, anyone who wants to email me for the drawings (i.e. my hand drawn chicken scratchings) I will send.
Jeff
On Jan 29, 2014, at 12:35 PM, Wilbur, David J. wrote:
> Recent posts have convinced me I should replace my latex nitrogen transfer line with stainless steel. Can anyone suggest US vendors?
>
> Thanks,
> Dave
>
> ____________________________
> David J. Wilbur, Ph.D.
> Instrumentation Specialist
> Department of Chemistry
> Tufts University
> 62 Talbot Ave.
> Medford, MA 02155
> voice: 617-627-2163
> Fax: 617-627-3443
> email: david.wilbur_at_tufts.edu
>
Jeffrey H. Walton
UC Davis NMR Facility, 4303 Tupper Hall
Biomedical Engineering Graduate Group
One Shields Ave.
University of California
Davis, CA 95616
(530) 752-7794 (office)
(530) 752-6480 (MS1-D lab)
(530) 754-0133 (CalEPR, Chem 76)
(530) 754-8238 (Chem 93 lab)
(530) 754-6633 (CMGI)
(530) 752-9052 (FAX)
mailto:jhwalton_at_ucdavis.edu
NMR Facility: http://www.nmr.ucdavis.edu
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Britt Lab: http://brittepr.ucdavis.edu
Biomedical Engineering: http://www.bme.ucdavis.edu/people/graduate-group-faculty-2/grad-group-profiles/jeffrey-walton/
Received on Fri Jan 31 2014 - 09:38:35 MST