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Bimetallic thermometers are contact temperature sensors found in several forms if you know where to look, e.g. inside simple home heating system thermostats.

They're the coil of metal that has some electrical contacts affixed to it. They are more familiar to many people in industry and commerce as miniature pocket dial thermometers that many people use to check the temperature of fat in a deep frier or a vat on a small process line.

Perhaps the best part is that the pocket thermometers are sealed and do not require batteries! The major uses are where a quick check of the temperature of an object is desired, or, in the case of the thermostats, a simple, reliable, low cost sensor that provides the input and sometimes a good part of the control action in a home heating system.(Nowadays electronic thermostats are more commonly seen and since they need a battery to power the clock inside them, they usually have a different type of temperature sensor, one that also runs with a battery.)

You can learn more by clicking on the links highlighted below.

A list of vendors is on a seperate page, as indicated below, but many of the multi-line temperature sensor vendors, including some of the large distributors of sensors offer an interesting array of bimetallic pocket thermometers,


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