Product Overview The SensorWorx SWD-221 is a digital ceiling-mount occupancy sensor designed for commercial lighting control applications. It combines passive infrared (PIR) and acoustic sensing for dual-technology occupant detection, helping maintain reliable occupancy detection in spaces where movement may be limited or obstructions are present. The sensor communicates with paired SensorWorx digital load controllers over a topology-free 3-wire digital data line. Key Features & Design Functionality: Combines PIR motion detection with passive acoustic sensing. PIR detection initially enables the acoustic sensor, while qualifying occupant sounds can reset the occupancy time delay during periods of limited movement. Installation context: Ceiling-mount design for commercial applications including small offices, copy rooms, private restrooms, classrooms, open areas, conference rooms, hallways, and break rooms. Dual-technology sensing is particularly useful where occupants are seated or where obstructions may interfere with PIR line of sight. Notable specifications: 360° small-motion coverage; approximately 500 sq ft coverage; recommended mounting height of 8–15 ft; 15 VDC operating voltage; 9 mA current draw for dual-tech models; 4.00 in diameter × 1.25 in high; 4.75 oz; white matte finish. Contractor-relevant details: Uses a topology-free 3-wire digital data connection with common 18/3 cable and wire nuts. The sensor pairs with SensorWorx digital load controllers and supports out-of-the-box single-zone operation, push-button pairing for multi-zone installations, and mobile-app configuration when used with compatible advanced load controllers. Performance / Benefits The SWD-221 combines 360° PIR coverage with overlapping acoustic detection to improve occupancy sensing where occupants may remain seated or where furniture and other obstructions limit direct PIR detection. Its digital architecture simplifies integration with compatible SensorWorx load controllers, while multiple mounting and pairing methods support efficient installation in both small and larger commercial spaces.
