Linear detector of autoadjustable smoke from 8 to 50 meters, extendable to 100 meters, based on issuing equipment and recipient with reflector. Designed, made and certified under norm EN54-12. Reflector is supplied with a mirror, offering to the detector a scope of 50 meters. With certificate of homologation LPCB. Autoadjustable barrier capable of compensating structural displacements of the protected building. Simple assembly by means of box and base of premontaje.