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James Mackey wrote:
Perhaps someone can help with this question. Does anybody know
anything about a humidity device named "Protimeter PLC digital
hygrometer"? Or if anyone knows a website with info. I can find the
mfg site, but no info on this device.
There are two main kinds of hygrometers
-- chilled mirror, direct measure of dew point
(good for humidity in air)
-- RF, exploiting the huge polarizability of the water molecule
(good for moisture in solids e.g. grain or lumber)
http://www.google.com/search?q=protimeter+principle
which leads immediately to
http://www.sensorsmag.com/articles/0700/46/main.shtml
among others