What is an occupancy sensor?
Occupancy or motion sensors are devices that turn lights and other equipment on or off in response to the presence (or absence) of people in a defined area. Some sensors also control lighting based on the amount of daylight available in their coverage area. More sophisticated sensor units now offer users a variety of adjustment capabilities; manufacturers have also introduced sensors that can be integrated into a building’s automation and control system. A complete sensor unit consists of a motion sensor, an electronic control unit, and a controllable switch/relay. It also has a timer which signals the electronic control unit after a set period of inactivity. Some units also incorporate an optional daylight (or light level) sensor. Units are available in wall-mounted switch configuration for use in offices or other small areas and in ceiling and wall-mounted configurations for large, open areas. There are also sensors specifically designed for bathrooms, stairwells, and hallways. Avail
