Hi all,
On the subject of removing stuck samples, there are probably as many variations
as persons in this conversation. My preferred method is to use a thin dowel
or piece of straight (relatively) plastic tubing of appropriate length and put
a loop of tape on the end (just smaller than the bore). I insert the dowel
until it reaches the sample, give a gentle twist to catch the tube with the
tape, and lift the sample out. Works like a charm.
All the best,
Rick
Richard W. Fitch
Professor, Department of Chemistry and Physics
Councilor, Wabash Valley Section, American Chemical Society
Indiana State University
600 Chestnut Street
Science Building, Rm. S35E
Terre Haute, IN 47809
Phone: (812) 237-2244
Fax: (812) 237-2232
"Do an apparently simple experiment that gives you an important bit of information..."
Julius Axelrod
The love of money is the root of some evil. Fear and insecurity are the ro=
ot of most of it.
> From: main_at_ammrl.groups.io On Behalf Of Steve Clemens via groups.io
> Sent: Wednesday, January 28, 2026 10:38 AM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] dummy samples frequently get stuck in sample changer
I'm curious as to why you keep a dummy sample in the magnet when it's not in use.
Over the years I've had several samples go into the magnet with the lift gas
off. All but one of them landed without damaging anything: the backpres
sure of the air in the bore coming past the spinner as it falls slows it
down a lot, and when the spinner enters the constricted part at the top of
the shim tube (lower part) the sample is aligned to the probe cavity (note:
this is with lightweight spinners like the blue POM or white Kel-F).
The one that did break went down when there was already a sample in the magnet.
It landed on top of the sample that was in there and broke. Luckily Bruker
designed the spinners such that they can hold the volume of a typical 5 mm
sample in the top so it didn't leak into the probe. Getting it out was the
challenge - I had to remove the probe and push it up from the bottom.
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Received on Wed Jan 28 2026 - 12:02:24 MST