Peter Todd wrote:
> Alternately if you have any other cheap suggestions for how to get
> myself a nice dry atmosphere in a hermetically sealed enclosure I'd be
> interested.

I have a project that's well-sealed - not hermetically, but splashproof 
and perhaps submersible - and used in cold environments with high 
humidity.  I use conformal coating, plus a small power resistor as a 
heater on the board.  Evidence suggests the heater alone may be 
sufficient.  I'm guessing as long as the inside temperature is higher 
than the outside air, condensation won't happen (which is my concern).

Just another possible approach, depending on your requirements.
-- 
Timothy J. Weber
http://timothyweber.org
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