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Occupancy Sensors

Occupancy sensors, also commonly called motion sensors, control lighting automatically by switching lights ON or OFF depending on the presence of people in a space. Occupancy sensors use two types of technology. One is passive infrared which senses occupancy by detecting differences in heat between humans and the background of the room. Another approach is ultrasonic occupancy sensing. A sound is emitted beyond the ability of humans to detect. The sound waves bounce off objects in the room. Any movement in the room causes a shift in the sound wave pattern indicating occupancy. Some occupancy sensors combine passive infrared and ultrasonic in one unit.