311 Ceiling PIR Detector (IP40). Available only as spare parts, not for new cases. Alternative products 320 and 320P. (Discontinued)

The 311 Ceiling PIR Detector is a compact unit that provides energy-saving functions in a DALI system. It contains a Passive infrared detector (PIR) and an Infrared receiver. As a presence detector, the unit can turn the lights on when a room is occupied, and off when the room is unoccupied.