----- Original Message -----
From: Jacobsen, Neil E - (neil) [mailto:neil_at_email.arizona.edu]
Sent: Friday, August 31, 2012 06:32 PM
To: ammrl_at_ammrl.org <ammrl_at_ammrl.org>
Subject: AMMRL: Samples ejecting (like missiles) from magnet
I have a similar problem with our DRX-500. The Oxford magnet is more than 20 years old but the shim stack and bore tube are circa 1999 (DRX). On very rare occasions the sample gets stuck in the magnet and will not eject. Sometimes you can turn up the air pressure a lot and get it to suddenly release and launch into the air. Other times nothing works and we have to push the sample up from below (after removing the probe) with a wooden stick. I find it hard to believe that just finger goo or dirt could cause that, but I swab out the probe with ethanol afterwards just in case. There is nothing unusual about the sample tube. Maybe someone can tell me what causes this!
Neil
Neil E. Jacobsen, Ph.D.
NMR Facility Manager
Department of Chemistry and Biochemistry
University of Arizona
1306 E University Blvd.
Tucson, AZ 85721
520-621-8146
________________________________________
From: transplatin_at_gmail.com [transplatin_at_gmail.com] on behalf of Ken Knott [kknott_at_vt.edu]
Sent: Friday, August 31, 2012 7:52 AM
To: ammrl_at_ammrl.org
Subject: AMMRL: Samples ejecting (like missiles) from magnet
Hello everyone..
In our Agilent MR400 system we have an occasional but increasing
issue. Every once in a while, sometimes once a week, sometimes twice
in a day, samples will literally fly out of the bore to crash on the
magnet and eventually shatter on the floor.
Nothing has changed in the gas regulators in the console nor the air
regulators feeding the console. They are all set as they have always
been.
It seems as if something is getting stuck, pressure builds, and
releases suddenly upon eject...
Has anyone come across an issue like this?
Thanks,
Ken Knott
Assistant NMR facility manager
Virginia Tech
540-231-8256
Received on Sat Sep 01 2012 - 16:52:05 MST