Like anything else, I'm sure they can fail from time to time.
The older mechanical ones used a ribbon of a material sensitive to moisture that would change in length in response to changes in humidity, thereby operating a microswitch.
Newer, electronic units use a sensor made of a material who's resistance varies with changes in humidity, and an electronic circuit that produces an on or off signal in response to changes in humidity vs. controls setting.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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