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Dual Technology Sensors

Dual technology sensors combine passive infrared technology with another sensor for a more accurate occupancy/vacancy sensing. Using one sensor type on its own is usually prone to false activation or have a limited field of view, so combining two sensor technologies works well. Other types of occupancy sensors include ultrasonic sensors, humidity sensors and microphonics sensors. Ultrasonic and microphonics occupancy sensors use sound waves to detect motion in a room, while humidity sensors detect the humidity level.

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Ultrasonic Occupancy Sensors

Ultrasonic occupancy sensors transmit high frequency sound waves into the space that bounce back from objects within the room. When an ultrasonic sensor emits sound waves and encounters a moving object, the sound wave pattern is disrupted and triggers the sensor to activate the light. The biggest advantage of ultrasonic occupancy sensors is their ability to detect occupancy through obstructions like partitions, cubicles and walls. However, ultrasonic sensors are prone to false activation by vibrations or sounds from adjacent rooms. Unlike PIR sensors, ultrasonic motion sensors would work well on storage rooms, partitioned bathrooms, shower rooms, large offices with cubicles and garages.