I have seen a variety of issues over the time but not found a fix either. The
only suspicion I have is that maybe the lighting may play a role. I believe
some people have had issues with the loading when it was very sunny and brighter
in the room than usual. But I've never found any consistency in the failures
(apart from absolute struggles getting a ceramics spinner with J-Youngs tube
ejected even without a sample changer...). As long as you have set the gas
pressure to (just about) work with the heaviest (presumably POM) spinners and
the others don't shoot out or wobble too much with it, you should be able to
exclude weight as an issue (assuming the majority of tubes aren't too different
in weight).
On the different shapes Todd mentioned, Bruker started producing the ones with
groves particularly for 400MHz or smaller magnets I believe and the straight
ones are for 500MHz+. There are two different items available on the website
and the 500MHz and higher ones are around $100 more expensive from what I can
see, although the other ones don't specify a MHz bracket. The sticker can just
be replaced and when we had the different spinners they had the same reflective
strips on, so that may just be an age thing. For your particular case I would
assume given the straight ones are slightly heavier and the yellow strip is
thicker it may ever so slightly more often have issues lifting and spinning
it where it needs to detect the sample/spinner before inserting. Maybe a tiny
tweak to the gas flow or separating the spinners if you have multiple magnets
may be a solution if you have consistent issues with failures?
Vanessa Timmermann
NMR Analytical Lead
Tenax Road, Trafford Park, Manchester, M17 1WT
Vanessa.Timmermann_at_siigroup.com |
http://www.siigroup.com
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https://www.siigroup.com/images/SIG_logo.jpg ]
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