We had the same problem. Its frequency was reduced considerably after I
posted a big, scary warning near the red lever. A few student bones
near the carousel would help too...
Eugenio
Eugenio Alvarado, Ph.D.
NMR Facility Director
Chemistry Department, room 3500. University of Michigan
930 N. University Ave., Ann Arbor, MI 48109-1055.
Voice: (734)-764-9924
On 10/5/26 10:22 AM, Kenneth Sharp-Knott via groups.io wrote:
> Hi everyone,
> We are experiencing frequent, spurious autosampler error trips on our
> 60-position SampleCase. Despite user education, users loading or
> retrieving tubes near the transport mechanism frequently brush against
> the red safety / tube-height detection arm.
> Compared to our 24-position units, the mechanism on the 60-position
> carousel feels loose, has weaker return tension, and seems prone to
> cause errors. Even a slight nudge trips the sensor, turns the status
> light solid red, and halts automation until manually reset.
> Has anyone implemented an effective physical or mechanical workaround
> for this (e.g., auxiliary rubber bands, some kind of maintenance to
> the pivot point, or other suggestions) to prevent false trips without
> bypassing the over-length safety check?
> Any insights or field fixes would be greatly appreciated.
> Thanks,
> Ken Sharp-Knott
> Senior Manager, NMR & Analytical Core Facilities
> Department of Chemistry
> Virginia Tech
>
> (540)267-6502 (Cell)
> (540)231-0885 (Office)
>
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Received on Mon Oct 05 2026 - 08:36:11 MST