Hi Fu,
Please see attached for the compressed gas requirements from the Bruker site
planning guide.
And I looked at one of your instruments in our database and it looks like
there's a nitrogen separator with it. So I'm going to make the assumption
that all your instruments are configured similarly. In that case,
switching over to nitrogen you can just take out the nitrogen separator,
reduce your compressed gas consumption somewhat, and get similar results.
Cheers,Mike
On Friday, September 26, 2025 at 07:30:23 AM MDT, Shin, Ronald via groups.io wrote:
Fu,
Assuming you're carrying out mostly room temperature experiments:
For your 400 MHz and 500 MHz, instruments, you're not going to notice any
significant difference between using air vs nitrogen.
For your 600 MHz instrument, you may notice it being a bit more difficult
to get a very nice shim, but you should easily be able to meet the specs
for your system.
Just as a comparison, at our old facility, when we got our Cryoprobe, we were
using dry compressed air for the probe gas, and on our unshielded Mark I
Oxford 600 MHz magnet, I was always able to shim it to a 5.5 / 11.0, 0.55 Hz
lineshape using air. Specs on that system from Bruker were listed
as 7.0 / 14.0, 0.60 Hz.
At our current facility (still using the same Cryoprobe), I can shim our double
shielded Ascend 600 MHz magnet to a 3.0 / 6.0, 0.35 Hz lineshape using nitrogen
generated by a nitrogen separator.
Ronald Shin
University of Alabama at Birmingham
O'Neal Comprehensive Cancer Center
Central Alabama High Field Nuclear Magnetic Resonance Facility
> From: main_at_ammrl.groups.io on behalf of Fu Chen via groups.io
> Sent: Thursday, September 25, 2025 5:22 PM
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] compressed N2 gas vs compressed Air Hello all,
We are considering replacing the compressed air with compressed house N2.
Does anyone have a spec sheet or other documents for comparing using
compressed N2 gas vs compressed Air for Bruker NMR instruments?
Thanks,Fu
Fu Chen, PhD
Director of Analytical NMR Facility
Department of Chemistry and Biochemistry
B0208A Chemistry Building
University of Maryland,
College Park, MD 20742
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Received on Fri Sep 26 2025 - 07:08:41 MST