Ultrasonic Occupancy Sensor

Hubbell Ultrasonic Sensor

Ultrasonic sensors emit inaudible sound patterns at frequencies that are above human sensitivity, typically 25, 30 and 40 kHz, that cross the space and return. Motion in the space changes the pattern of the waves, activating the sensor. Ultrasonic sensors are best suited for spaces where line-of-sight view to the occupant is not always available. This type of occupancy sensor detects very minor motion better than most infrared sensors and is often used in restrooms since the hard surfaces will reflect the sound pattern.

Ultrasonic sensors provide greater coverage that PIR detectors, however the increased sensitivity means that ultrasonic sensors are more susceptible to false triggers from any movement in the space. Careful calibration and placement away from breezeways, open windows and HVAC systems should help reduce false triggers.

Contact a Graybar Lighting Consultant to learn more about ultrasonic occupancy sensors offered through Graybar.