Hi Eugenio,
Next time it happens I recommend attempting to confirm independently that
the sample is out of position inside the bore (if you haven't already). For
example, peering down with a flashlight I can usually tell if a sample is
stuck partway, and in some magnets there's an audible "click" when the
sample arrives at the bottom. If they don't travel the full distance then
my first step would be a quick clean with the time-tested qtip method to
make sure nothing's obstructing movement. Should it come back clean then
excess airflow as you already mentioned seems a likely culprit. Have you
noticed if the samples experiencing problems have lower than average mass
(smaller tubes, low density solvents, <0.6 mL solvent)?
An issue with the optical sensor could also report as a sample position
problem. Spinner condition affects the sensor voltage readout, and the
markings can fade and get worn off. If any of your spinners look tired
then a touchup with black/white sharpie marker might do the trick. The
sensor itself can also get dirty and require cleaning, and unfortunately
the only reliable method I know involves removing the BST. Someone at
Bruker might know how to access the sensor voltage readouts and/or adjust
threshold settings. I know it's possible for SampleXpress, not sure about
SampleCase.
Kind regards,
Luke
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Received on Tue Dec 16 2025 - 15:21:52 MST