Hi Jessica,
Two things—when the console tries to detect the sample, it turns the
spin gas on for a short time and if it sees something move, it assumes that’s
a sample. Either dirt on the top of the shim coil, or dirt on the sensor in
the bottom of the BST could block that signal and prevent sample detection.
If you look down the bore to the where the spinner sits you can sometimes see
a grey glob of accumulated dirt… Either way, might be worth cleaning
out the shim system.
As for getting a sample out, the simplest temporary solution is to crank the
VT gasflow up to maximum (and then turn on the lift if you need to.) A more
permanent solution for getting the sample out in manual mode is to go into the
BSMS service webpage and adjust the “hold gasflow” in the
sample section if I recall correctly.
Cheers,
Mike
From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Roberts, Jessica
Sent: Wednesday, July 26, 2023 8:11 PM
To: main_at_ammrl.groups.io
Subject: Re: [AMMRL] SampleCase loading errors
Hi everyone,
Thank you all for the detailed responses - I appreciate the guidance as I work
through this!
A brief update - a student was utilizing the instrument tonight and, while the
sample went down into the magnet (after a few up and down cycles), it appears
TopSpin does not realize there is a sample within the magnet. Troubleshooting
thusfar has involved disabling the autosampler and trying to utilize the lift
option to manually eject. Unfortunately, it appears the air pressure is not
ample enough to eject the sample/spinner.
Does anyone have any tricks for this issue? I will be working on this an hoping
to resolve this as soon as possible. (and then get back to addressing the other
potential troubleshoots for the previous email's issues).
Thanks again everyone!
Jessica
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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