Dear All,
This appears to be a common issue with the 60-position SampleCase+ units.
Installing a stronger spring fixes the arm sticking problem nicely. Credit
to Sean Bowen who shared this idea with AMMRL in April 2024
https://ammrl.org/archives/April-2024/0052.html, pointing to a replacement
spring from McMaster-Carr part number 94135K164.
I installed this replacement spring on our SampleCase+ to increase the
return tension. Now, if a user accidentally brushes or bumps the red
height-detection arm while loading or retrieving tubes, the arm immediately
snaps back to its home position rather than hanging up and leaving the arm
in a 'tripped' state. In my experience, it has kept the over-height check
functionality without causing false error halts, and importantly: I haven't
seen it break any tubes.
Note: Newer firmware versions automatically clear the trip state and return
to normal operation once the arm returns home (I'm on TS 4.5.0). Firmware
from slightly older version(s) of TS (I forget the exact version(s))
tripped a persistent error mode when the arm was moved, requiring a reset
via the emergency stop button.
Best,
Thomas
--
Thomas G. Smith
smit3684_at_umn.edu
Chemistry NMR Laboratory <
https://cse.umn.edu/chem/NMR>
University of Minnesota
(612) 625-8374
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Received on Mon Oct 05 2026 - 09:26:13 MST