Analog smoke detection barrier by infrared light beam reflection for analogue exchanges. Composed of emitter and receiver mounted on the same unit and a reflector element. It connects directly to the analog communications loop and feeds on the loop itself, addressing from 01 to 159. Easy alignment, indicating the value of the received signal in two 7-segment displays. It incorporates compensation for dirt, three status LEDs and short circuit isolator. A 200 x 230 mm reflector is included for distances of 10 to 40 m. Ideal for the protection of large-scale warehouses and spaces with very high ceilings. It includes test filters.