A device that senses temperature change and changes some dimension or condition within to control an operating device.

Two dissimilar metals fastened together to create a distortion of the assembly with temperature changes.

The rod and tube are each made of a different metal. The tube has a high expansion rate and the rod a low expansion rate.

An application of the bimetal. Two different metals fastened together in the form of a disc that provides a warping condition when heated. This also provides a snap action that is beneficial in controls that start and stop current flow in electrical circuits.

Using a bulb or sensor, tube, and diaphragm filled with fluid, this device will produce movement at the diaphragm when the fluid is heated or cooled. A bellows may be added to produce more movement. These devices may contain vapor and liquid.

A thin flexible material (metal, rubber, or plastic) that separates two pressure differences.

An accordion-like device that expands and contracts when internal pressure changes.

A device made of two unlike metals that generates electricity when there is a difference in temperature from one end to the other. Thermocouples have a hot and cold junction.

A group of thermocouples connected in series to increase voltage output.

A semiconductor electronic device that changes resistance with a change in temperature.