Helium boil-off/barometric pressure
Bill Thurmes (thurmes@displaytech.com)
Wed, 18 Feb 98 13:49:31 -0700
As others have pointed out, the helium boiloff rate changes depending on
the atmospheric pressure. (My observation is that it always seems to be
delayed by about 4-6 hrs - a pressure drop will result in increased
boiloff 4-6 hrs later.) With that in mind, it's kind of nice to have a
way to check the recent barometric pressure. Check out NOAA's web site
(http://iwin.nws.noaa.gov/iwin/iwdspg1.html) - there's probably a link to
a nearby weather station that has barometric pressure over the last 24
hrs. Bookmark it, then check it any time you see a suspicious rise in the
boiloff rate.
--Bill
Bill Thurmes 2602 Clover Basin Dr. Phone:(303)772-2191
Sr. Research Chemist Longmont, CO 80503 Fax: (303)772-2193
Displaytech, Inc. e-mail thurmes@displaytech.com
www: www.displaytech.com
If we can't find a way, we must make one - Hannibal