I am curious how many people are using these slotted tips on the delivery
side of the transfer tubes?
I have seen them around at magnet sites but rarely see them in use. In
addition to what Dean said about clogging I could also see that it might be
a means of being sure that you do not direct a jet of "warm" (i.e. a few
degrees above the boiling point of liquid Helium) Helium gas downwards.
This is particularly important given that many current magnets now have the
top of the magnet above the liquid level at the standard fill time. Many
old Oxford dewar designs had the magnet still under liquid even at 0%
Helium reading at the standard fill time.
Joe
*******************************
Joe Dumais, Ph.D.
Associate Research Professor/Nuclear Magnetic Resonance Spectroscopist
Boise State University
College of Arts and Sciences
Department of Chemistry and Biochemistry
1910 University Drive, Boise, Idaho 83725-1520
(208) 426 4913
http://chemistry.boisestate.edu/
*******************************
Sent from an MS Windows PC
On Mon, Mar 14, 2016 at 12:08 PM, Olson, Dean <dolson_at_illinois.edu> wrote:
> The tip is designed to never clog by hitting any ice debris inside the
> magnet. When the tip is inserted downward into the magnet, the slots in
> the tip point upward so the liquid helium or nitrogen can always emerge
> without obstruction. Turn this object over and look at it in your hand,
> and the slot angle might make it look like a little pine tree.
>
>
>
> One can only wonder why the new helium transfer line does not come with an
> appropriate fitting.
>
>
>
> ***********************************
>
> Dean L. Olson, Ph.D.
>
> Director, NMR/EPR Lab, 146 Roger Adams Lab
>
> School of Chemical Sciences
>
> U. of Illinois at Urbana-Champaign
>
> 600 S. Mathews, Box 81-5, MC-712
>
> Urbana, IL 61801 USA
>
> Lab: 217-244-0564; Cell: 217-722-9432
>
> dolson_at_illinois.edu
>
> http://scs.illinois.edu/nmr
>
> http://scs.illinois.edu/epr/
>
> ***********************************
>
>
>
> *From:* Kenneth Knott [mailto:kknott_at_vt.edu]
> *Sent:* Monday, March 14, 2016 11:55 AM
> *To:* ammrl_at_ammrl.org
> *Subject:* AMMRL: Helium transfer 'Christmas Tree' fitting
>
>
>
> A neighboring institution is getting a new Bruker 400 system installed and
> they've been told they need to get a 'christmas tree' adapter/fitting for
> their transfer line. Their engineer hasn't been to helpful telling them
> where to get one.
>
>
>
> We have one that we've had for ever, but not really sure where it
> originated from.
>
>
>
> Any suggestions? And how exactly did this thing come to be known as a
> christmas tree???
>
>
>
> Thanks!!
>
>
>
> --
>
> Ken Knott
>
> Department of Chemistry
>
> Analytical Services
>
> Virginia Tech
>
>
>
> (540)267-6502 (Cell)
>
> (540)231-0885 (Office)
>
Received on Wed Mar 16 2016 - 07:55:29 MST