Hi everyone and happy Friday!
I have been trying to diagnose and remedy an error that has been occurring
multiple times within the past week on our Bruker 500 MHz Ascend magnet:
“Digital LN2 Level Sensor shut down: no more measurement data arrived!”
When one of the researchers reached out to me late last night with this error,
I immediately went through what I thought were reasonable steps to assess the
magnet:
-My NMR TA performs weekly LN2 fills, with the last one being done this past
Wednesday (November 1). They are newer, and though I had trained them with
the fill and made sure they felt plenty comfortable before having them perform
it on their own, I wanted to fact check that everything was good on that end.
I performed a LN2 top off today, ensuring that I see LN2 coming out of the
outport in the stack. I had figured that my TA performed the fill correctly,
but my first thought was perhaps they were relying too heavily on the digital
readout of the LN2 level and perhaps underfilled. Based on how quickly the
magnet was topped off, I feel confident that is not the case.
-While performing the LN2 top-off, I also wanted to ensure there was no reason
to believe that there was a partial blockage in the magnet; the response to
the LN2 was normal and there did not seem to be anything in the way of abnormal
backpressure.
-I have been continuously studying the temperatures (sample as well as shim
coil) of the magnet to ensure there is nothing odd going on there that might
indicate instrument hardware issue or potential cryogen leak.
I am curious who might have experienced this error before and what you might
be able to provide in the way of guidance in this endeavor? The error occurrence
itself does not seem to have any particular pattern, occurring both during runs
and while sitting idle. The student last night was able to have some success by
restarting the software and I am considering a power cycle of the instrument in
case it is a goofy communication issue, but I want to be sure that there is no
issue with the hardware or otherwise. Ideally, I’d prefer to get rid of
the error message altogether. 😊
Thank you to everyone in advance!
Cheers,
Dr. Jessica M. Roberts, Ph.D.
Assistant Professor of Instruction
NMR Facility Manager
Department of Chemistry and Biochemistry
Ohio University
245 Chemistry
Athens, OH 45701
740.593.0038
jroberts_at_ohio.edu<mailto:jroberts_at_ohio.edu>
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Received on Fri Nov 03 2023 - 12:31:04 MST