Chapter 2
Input Devices and Sensors
Occupancy Measurements
Occupancy sensors are commonly used in building control systems to
operate lighting and room air conditioning equipment. Sensors turn lights and
air conditioning equipment off (or to reduced levels) when no occupants are
detected. This is done to minimize energy consumption. Occupancy sensors may be
designed to detect motion or differences in background infrared radiation and
the radiation emitted from a human occupant. Many occupancy sensors used for
lighting also incorporate photocells or other light sensitive devices to reduce
lighting when ambient light is sufficient.
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