Yes this is a problem! One thing that can be done about it is to bake the dewar while pulling a vacuum on it or another is the use of ultraviolet light.(To dry it up) I don't know what else I can tell 
you without revealing anything that is proprietary.


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    Dan Sadley                 
 [log in to unmask] 
Princeton Instruments,Inc.
3660 Quakerbridge rd.    
Trenton, NJ 08619         
(609) 587-9897 x-179     
 Fax (609) 587-1970        
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----------
From:   PC :[log in to unmask]
Sent:   Wednesday, August 20, 1997 3:02 PM
To:     [log in to unmask]
Subject:        [TECHNET] Moisture in Liquid Nitrogen

<<File: ENVELOPE.TXT>>
Greetings:

I have a question regarding moisture in LN2 Dewars.  My assumption is under
normal conditions, the moisture would be frozen solid and have a very low
vapor pressure, but what happens to the ice as the dewar becomes empty...
anyone else experienced a problem that could be attributed to moisture in a
LN2 system?

Thanks,

   Tom Ostertag
   [log in to unmask]
   [log in to unmask]
   [log in to unmask]
   Minneapolis, MN