Hello all,
I would be interested if any one has advice for conserving He in the lab.
I've reviewed the fill procedures in the magnet books, but didn't pick
up anything new. I already chill my transfer line with gas, and not by
putting the stick into the liquid, etc. One thing I changed is that I no
longer let any fills proceed to a plume out the manifold. I stop them
around 92-95% at most.
Are there any other tips for conserving He?
E.g. is there an optimal fill level/range? From my fill log, it appears
to me that losses are linear (with time and N2 level) over the
recommended fill volumes, at least atmospheric pressure is having a
bigger effect than anything else. Is this incorrect? Or are there other
experiences?
It really doesn't help that my four magnets each have different transfer
lines! I do make a compromise and fill with one line, but worry about
introducing air when the line is narrow for the fill port.
We've been getting 100% of our orders here and our sales rep has
committed to continuing that (300 L /quarter ann.). Although the price
has almost doubled, so far.
Matthew
--
Matthew Devany, Ph.D.
Director NMR Laboratory
Department of Chemistry
Hunter College of the City University of New York
695 Park Ave., Rm. N1302
New York, NY 10065
Office: 212-772-5361
Lab: 212-772-5337
Fax: 212-396-6327
http://www.hunter.cuny.edu/chemistry/facilities/nmr/home
Received on Thu Sep 12 2013 - 09:37:01 MST