Hi Ken,
It’s not uncommon that as these sample changers age the slider moves
around a little and is no longer in good alignment with the tube at the top
of the shim system. This tolerance is fairly tight and if the sample falls
down there and gets cocked to one side then this is a sign that the alignment
is probably off. If you have the slider over the shim system and you run your
fingers around the interface between the sample transporter and that tube, if
you can feel that they’re not nicely lined up, then you might be out
of tolerance. There is a procedure for aligning this—it’s kind of
fiddly and if you don’t really need to do it you risk fouling things
up more, so I don’t recommend doing it unless you really need to.
Cheers,
Mike
> From: main_at_ammrl.groups.io On Behalf Of Hasan Celik via groups.io
> Sent: Wednesday, March 6, 2024 8:00 AM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Bruker SampleCase: Samples getting stuck as they are dropped down the transport tube
Hello Ken,
We had this problem before. It turned out that the bolts holding the metal
part that guides the spinner into the transport tube got loose over time (~ 5 years
after the installation). I had to remove the plastic transparent plastic cover
around the unit to access them. Once I lined up the metal part that latches
onto the plastic tube and tightened the bolts, it didn't happen again.
Best,
Hasan
> On Wed, Mar 6, 2024 at 6:54 AM Kenneth Sharp-Knott wrote:
Has anyone had any issues with their spinners getting stuck at the top of the
transport tube as they are dropped? It is a little difficult to see just why
they're getting stuck, but they appear to be kinked at an angle at the top of
the transport tube.
I've changed the rubber band - no effect.
The air pressure may be a bit lower than what Bruker wants 5.5 bar vs 6, but
it's the same exact air pressure I've had since it was installed.
Seeking the usual wise advice and counsel for the AMMRL greats.
Ken Sharp-Knott
Manager of Analytical Services and the NMR Facility
Department of Chemistry
Virginia Tech
(540)267-6502 (Cell)
(540)231-0885 (Office)
--
_____________________________
Director, PMRC Core NMR Facility
College of Chemistry
University of California, Berkeley
227A Hildebrand Hall
Office: (510) 643-9829
Cell: (949) 732-8175
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Received on Wed Mar 06 2024 - 10:02:25 MST