Re: cryogen sensors
federspi (federspi@CHUMA.CAS.usf.edu)
Wed, 5 Aug 1998 11:46:19 -0400 (EDT)
Joe,
While I have a liq. He sensor on our AMX, it has in the past
had an ice block and after that time would not read below 83%. Taking the
top assembly off to remove the sensor apparatus is not something I would
like to do in the field. When we had the system moved to a new lab, that
problem corrected itself.
However, I have always monitored the amount of helium added at
each fill and calculated the percent per week loss of the cryostat. In
this way, I use the sensor as an indicator and not the final authority.
Good luck, Ron
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Ronald F.Federspiel Department of Chemistry
Director, USF/NMR Center University of South Florida
email: federspi@chuma.cas.usf.edu phone: (813) 974-2344
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