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
backpressure 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 - 07:40:31 MST