Choose a ceiling motion sensor with a 360-degree coverage pattern and a detection diameter that matches the room, while accounting for ceiling height, partitions, furniture, and other obstructions. Smaller sensors suit compact rooms, larger-range models support open areas, and multiple sensors can help cover classrooms, lobbies, storage areas, or other spaces that exceed one sensor’s range.

Check the sensor’s specified mounting height, with many ceiling motion sensors designed for installation between eight and twelve feet, and place 360-degree models near the center of the protected area when practical. Account for walls, beams, light fixtures, ductwork, and other obstructions that may create blind spots, and use additional sensors for larger or irregularly shaped spaces when the coverage area calls for them.

Wired ceiling motion sensors require cable runs for power and alarm or control connections, so installers should plan pathways, mounting locations, and connections to the intrusion or automation system. Wireless ceiling motion sensors use batteries and radio communication, which can simplify placement and reduce wiring, but they must be enrolled with a compatible security panel or paired with compatible lighting controls.

Occupancy ceiling motion sensors detect people and can automatically turn lights on and off, while vacancy sensors typically require manual activation and turn lights off after the space is unoccupied. Security-focused ceiling motion sensors use passive infrared detection to identify movement and signal an alarm system, with features such as tamper protection, adjustable sensitivity, or wireless communication available on some models.