Hi Mike,
Thanks for the advice! Considering the number of samples we push through this
system, I suspect you're right that a dirty sensor is most likely the culprit.
Since the problem only started when we pulled the Prodigy probe out, it has
felt like it was somehow related to the probe itself, but maybe we just got
a bit more dirt on the bottom of the barrel.
In the past when this kind of thing would happen, I'd text Jeff (Parent) to
ask his advice, but I haven't wanted to bother him since he moved from Bruker!
I hope all is well!
Best,
Walt
-------------------------------
Walter Massefski, Ph.D.
Director
Department of Chemistry Instrumentation Facility
Massachusetts Institute of Technology
77 Mass. Ave. Rm: 18-0090
Cambridge, MA 02139
T: (617) 253-2016
wwm_at_mit.edu
> On Jul 14, 2023, at 11:24 AM, Michael Groves via groups.io <m.groves=utah.edu_at_groups.io> wrote:
>
> Hi Walt,
>
> Sounds like you busted it good…
>
> Seriously, though, there are several things that could cause this. Here
> are a few in no particular order:
>
> If the VT gasflow is a bit too high and sample spinning is turned on, it
> can lift the sample enough that "sample down" signal is lost
> and the sample changer thinks the emergency lift is on.
>
> If the sensor at the bottom of the BST (the upper section of the shim stack)
> is getting dirty, the SampleXpress could think that the sample is lifting and
> throw that error message. Based on the age of the system and the fact
> you've got a sample changer, I would probably check this first.
> Depending on how well people clean their samples, dirt tends to build up.
> Some people have had success using a long wooden dowel and some sort of wipe
to fashion a giant swab to clean out the shim system. If you want good
> instructions for this, I'd get in touch with Bruker Center
> (center_at_bruker.com <mailto:center_at_bruker.com>).
>
> It could be a faulty SPB. Sometimes the valves in these fail in interesting
> ways and instead of smoothly regulating the VT gasflow you get random spikes.
> Which could result in the sample lifting enough to cause the emergency eject
> error. This might also be caused by some sort of intermittent leak - it's
> probably not a bad idea to go over the VT gas connections to make sure there
> are no leaks and that the tubing hasn't become brittle.
>
> There's a short cable that connects the samplexpress to the shim system. That
> could be failing, but I think that’s the least likely alternative.
> You could always disconnect it and reconnect it.
>
> Cheers,
> Mike
>
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Received on Fri Jul 14 2023 - 12:51:57 MST