Sail switch

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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 of a fluid such as air or water. [1] 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. [2]

A sail switch might be used to protect a fan-forced pellet stove, a central heating system, or an electric heating element from being energized before the air flow from the blower is established. [2] Sail switches might also be used to alarm if a ventilation fan in a hazardous location fails, causing air flow to stop. 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. [3]

References

  1. ↑ Matthew J. Darr; et al. (2007). "A Robust Sensor for Monitoring the Operational Status of Agricultural Ventilation Fans". Transactions of the ASABE. 50 (3): 1019. doi:10.13031/2013.23142.
  2. 1 2 Steven J. Hoff; et al. (June 2009). "Real-Time Airflow Rate Measurements from Mechanically Ventilated Animal Buildings". Journal of the Air & Waste Management Association. 59 (6): 685. doi: 10.3155/1047-3289.59.6.683 . PMID   19603736. S2CID   46390769.
  3. ↑ "Honeywell S688A1007 Sail Switch SPDT". Bel-Aire. Retrieved 20 December 2015.


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