These 2 magnets have only a fill and charging port and no He level detector
port like most magnets. I was wondering if anyone has every used the fill
port as a level detector port and simply removed and replaced the probe at
fills?
The peace of mind it offers seems to far outweigh the slight inconvenience
and extra care the probe needs when removed during He Fills. I know that
these 2 particular magnets are very quenchable since during a good % of time
between fills some of the solenoid is normally exposed above the liquid
(unlike modern magnets). Even so the small heat disturbance induced by a
probe pulse once a day is nothing compared to the violent action of
fluttering, the only alternative. Gemini's and R2D2's have been known to
quench on fluttering alone which places the person measuring in the absolute
worst position they can be, port open with one ungloved hand above the port,
no quench tubes, safety valves bypassed through the open port.
I think it would it be safer to use a meter.
Robert Harker
Engineer
University of Florida
Department of Chemistry
NMR Laboratories
Gainesville, Florida 32611-7200
352-392-4650 Business Hours (no voice mail)
352-392-8758 Business FAX
Received on Fri Jan 20 2006 - 17:45:57 MST