That is what we do at Honeywell. We get 80 psi in the line, and use a
regulator to step down for the NMR. This has proven to work quite well - no
problems with moisture condensation in the line at low temps which we had
observed with compressed air. One issue arose when the system was first set
up. There was some oil in the line which ended up coating the spinners in
the high resolution instrument and contamination the stator in the MAS
probe. I suspect that was residual from the construction. We have had no
repeats of this in the last 10 years.
Sean Curran
-----Original Message-----
> From: Alan Brown [mailto:abrown_at_fit.edu]
> Sent: Monday, November 29, 2004 5:34 PM
> To: ammrl_at_chemnmr.colorado.edu
> Subject: LN2 boiloff as spin/eject gas?
Hello --
In our new building, house nitrogen gas will be supplied by boiloff from a
big liquid-nitrogen dewar. Does anyone supply spin/eject gas to their NMR
this way? & if so, (1) what pressure does the system supply, and (2) how
do you regulate it to what the NMR needs?
-- thanks --
-- AL B.
Received on Tue Nov 30 2004 - 10:14:52 MST