Sail switch

A sail switch, vane switch or flow switch is a mechanical switch that is actuated on or off in response to the flow or non-flow such as air or water. A sail switch typically operates through the use of a paddle or a diaphragm which gets displaced due to the force of fluid or air moving past it. Sail switches find application in the detection of fluid flow and measurement of fan speeds. A sail switch might be used to protect a fan forced pellet stove,central heating system, electric heating element from being energized before the air flow from the blower is established.[1] Sail switches might also be used to alarm if a ventilation fan in a hazardous location fails and air flow has stopped. For some HVAC systems, a sail switch can activate an electronic air cleaner, a humidifier, or other equipment in response to airflow from the system fan.[2][3]

References
  1. http://www.appliedgmc.com/images/suburban_ntseries_furnace.pdf
  2. http://docs.electronicaircleaners.com/honeywell_s688_product_data.pdf
  3. "Honeywell S688A1007 Sail Switch SPDT". Bel-Aire. Retrieved 20 December 2015.
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