Hi,
We've just adopted a early 1990's vintage Oxford 300/89 with no magnet documentation. It's at field, but I have no idea of how much nitrogen I'll need per week or when to fill helium and how much to order. We have a helium meter, and I can use a dipstick to measure the N2 level in terms of inches from the bottom of the dewar, but I dont' have much of an idea of volumes and how %full or inches corresponds to actual amount of LHe/LN2. Does anyone with a simlar vintage magnet have an estimate of cryogen volumes, and especially at what % full I need to fill helium, and how big a dewar that would be (I'm guessing a 60L maybe)?
Thanks,
David
-----------------------------
David A. Horita, Ph.D.
Associate Professor
Department of Biochemistry
Wake Forest University School of Medicine
Winston-Salem, NC 27157-1016
Tel: 336 713-4194
Fax: 336 716-7671
email: dhorita_at_wakehealth.edu<mailto:dhorita_at_wakehealth.edu>
web: http://www.wakehealth.edu/Faculty/Horita-David.htm
Received on Sun Aug 14 2011 - 05:25:17 MST