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Ultrasonic Occupancy Sensors

Ultrasonic occupancy sensors generate high frequency sound waves beyond the capacity of human hearing. Movement in the sound wave field causes a change in wave frequency and the sensor responds by switching on area lights. When the change in frequency is no longer detected after a delayed-off time, the sensor turns off the lights.

Ultrasonic sensing technology provides highly accurate small-motion detection. They do not relay on line-of-sight sensing and are, therefore, more effective in sensing motion around corners and in cubicles. They are particularly appropriate for locations where only small amounts of motion are taking place.

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