Linear detector of smoke from 3 to 50 meters based on issuing equipment and recipient with reflector. Made and designed according to norm EN54-12. With certificate of homologation LPCB. It allows to realize the protection of big areas (up to 750m ² for equipment) from the only point in the installation. The detector is based on an issuing equipment that projects the infrared bundle up to a reflector that returns the transmitted sign, making possible to protect from linear form the area that crosses the bundle of infrared light.