I have noticed this a couple of times on my VNMRS 700 as well. A few cycles of resetting the VT and pneumatics, perhaps with rebooting the console in between does fix it, but I'm curious as well if there is a specific fix, rather than randomly resetting things.
Regards,
Neal
Neal J Stolowich, PhD
NMR Facilities Manager
Department of Chemistry
University of Louisville
From: Xuemei Huang [mailto:xhuang_at_ucsd.edu]
Sent: Friday, March 15, 2013 7:26 PM
To: ammrl_at_ammrl.org
Subject: AMMRL: VT controller has no gas flow
Hi, Everyone,
We have a 800MHz Varian VNMRS spectrometer equipped with cold probe. Recently I am running into a problem where I can not regulate the temperature. After I set the temperature, I see the VT starts flashing, indicating it's trying to change the temperature. But the temperature never changes. I tried to reset the VT controller, the pneumatics, as well as resetting the console. None of them seemed to solve the problem. The error message I am getting is that : VT controller has no gas flow. But I checked that there is sufficient air flow. Has anyone seen similar problem on this system? Any suggestions would really be appreciated.
Thanks,
Xuemei
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Xuemei Huang
Department of Chemistry and Biochemistry
University of California, San Diego
9500 Gilman Dr.
La Jolla, CA 92093
xhuang_at_ucsd.edu<mailto:xhuang_at_ucsd.edu>
(858)-822-2307
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Received on Mon Mar 18 2013 - 08:16:43 MST