> AMMRL,
>
> Our house nitrogen is being shut off permanently by the end of this month.
> We plan to use the boil-off from two 5-foot-tall N2 dewars which we'll plumb
> into the old house N2 lines in our lab facility. Has anyone else had
> experience with setting up an isolated, stable nitrogen gas delivery system
> in your NMR lab/facility?
>
For routine VT/eject/spin we use compressed air from a Balston type 75-20
air dryer/purifier. A single unit is used to supply four NMR
spectrometers with "-100 deg F" dewpoint air. The filters also remove oil
and particulates containing nasty metals and their oxides, like iron &
copper. It cost about $2500 in 1992, and has functioned flawlessly. We
estimate that the payback time was barely a year, compared with using
liquid N2 boil-off.
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Michael Strain strain@mango.uoregon.edu
Institute of Molecular Biology
University of Oregon voice: 503-346-4036
Eugene, OR 97403 FAX: 503-346-4854
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