The OSSMT provides for automatic switching of incandescent lamps, low-voltage lighting with electronic and magnetic transformers, and electronic and magnetic fluorescent ballasts. The OSSMT features a manual override switch that can be used to keep lights OFF while an area is occupied, which may be desired in conference rooms, classrooms and other areas during video presentations. Designed to replace a single-pole Decora wall switch, it fits in a standard wall box. The OSSMT-MD model requires a neutral and a ground connection. For retrofit applications, the OSSMT-GD model does not require a neutral wire for installation

OPERATION:

Occupancy sensors have two tasks: keeping the lights on while the space is occupied and, conversely, turning the lights off when unoccupied. Ultrasonic motion detection gives maximum sensitivity yet can be vulnerable to false ON from air conditioning air movement, corridor activity, and movement of objects such as curtains in the space. Infrared motion detection provides immunity to false ON, but lacks sensitivity of small motion. Leviton’s OSSMT combines ultrasonic (US) and passive infrared (PIR) sensor technology to monitor a room for occupancy to deliver unrivaled performance and reliability. The PIR is used to detect motion and turn lights on, while either technologies are used to keep lights on while occupied. This allows the US to be set to higher sensitivity levels minimizing false OFF conditions. The PIR portion gives immunity to false ON through a specialized Fresnel lens which divides the field of view into sensor zones. When a person passes into or out of a sensor zone, the sensor detects motion and switches the lights ON. The US sensors give maximum sensitivity and range in difficult spaces with irregular shaped rooms and partitions that can block the PIR field of view. A pair of US sensors will detect Doppler shifts caused by motion in a space. These sensors are more sensitive to small movements since they do not rely on zones. Sensitivity can be field adjusted to Low-Medium-High. This feature makes the OSSMT perfect for a wide variety of room sizes and configurations.