As a Bruker, I STRONGLY recommend exhaust tubing on the N2 outlet. If
that's what you're talking about. I know of AT LEAST one person whose
magnet would have quenched if they hadn't been using tubing on the exhaust.
Something about the fill wasn't quite right and the exhaust tubing routed the
nitrogen to the wall instead of down the side of the magnet.
If you're just talking about tubing that is normally installed on the ports
to route the boil-off away from the magnet and keep ice from getting in,
yeah, you're right--we haven't done that for a long time. The current
heat exchanger setup is safer and should prevent air from getting sucked in,
while if you've just got tubing on the exhaust ports you don't have that
protection.
Cheers,Mike
On Monday, December 22, 2025 at 07:12:26 PM MST, Thomas Eubanks via groups.io wrote:
I think this is all written by the safety guys. Neither Brucker or Joel uses
any exhaust tubing.
> From: main_at_ammrl.groups.io on behalf of Eugenio Alvarado via groups.io
> Sent: Monday, December 22, 2025 12:20 PM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] AMMRL: Tubing for LN2 fill exhaust
Natural rubber tubing, internal diameter 3/8", wall thickness 1/8", outer
diameter 9/16".
On 12/22/25 12:24 PM, Kenneth Sharp-Knott via groups.io wrote:
I think I've asked this before so forgive me, but I always end up with tubing
that too stiff, too soft, wrong size...
I think I just want ½" latex tubing but can anyone pass along what they
are using? We have a variety of Oxford, Agilent, Magritek and Bruker
magnets, but they all take the same size tubing.
Ken Sharp-Knott
Manager of Analytical Services and the NMR Facility
Department of Chemistry
Virginia Tech
(540)267-6502 (Cell)(540)231-0885 (Office)
-- Eugenio Alvarado, Ph.D.
NMR Facility Director
Chemistry Department, room 3500.
University of Michigan
930 N. University Ave.,
Ann Arbor, MI 48109-1055.
Voice: (734)-764-9924
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Received on Tue Dec 23 2025 - 10:48:34 MST