Dear Colleagues:
We have a 4mm CP/MAS VTN probe that has a problem. We usually set the EJ gas
to ca. 30% and the ejection usually works well and the rotor comes out with
not too much of a force to bang against the rod ceiling. In recent months,
however, occasionally the ejection action would not activate upon clicking
the eject button on the MAS control. I would need to increase the eject
pressure to ca. 60% to get the ejection going again, then lower it back to
30% and it will behave for a while. However, the ejection gas pressure needed
to re-activate the action has been increasing over time and now even with
eject gas at nearly 100% the ejection action would not kick in. I suspect
that one of the gas tubings in the probe might be aging and losing flexibility
which might have caused this problem. I wonder if anybody has done some
research about this problem and can share some wisdom.
Thank you,
Weiguo Hu
Director of NMR Labs/Chemistry & Materials
Conte Polymer Research Center
120 Governors Dr
University of Massachusetts
Amherst, MA 01003
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Received on Mon Oct 07 2024 - 07:28:56 MST