A flow switch, also known as sail switch or vane switch, is a mechanical switch that is switched on or off in response to the flow or non-flow of a fluid such as air or water. A sail switch typically operates through the use of a paddle which gets displaced due to the force of fluid moving past it. Sail switches find application in the detection of fluid flow and measurement of fan speeds.
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Portable clamp on flowmeters, portable heat and energy flow meters