Linear smoke detection barrier for conventional systems. Composed of transmitter, independent receiver and control unit with LCD display. Ideal for protecting large areas and spaces with very high ceilings where the structure has reflective surfaces. It has the option of adding a transmitter + receiver set to be monitored from the same control unit. It incorporates automatic dirt compensation circuit, alarm and fault relay output circuit and status indicator LED. Requires 12 / 24Vdc power from a power source conforming to EN54-4. Special ATEX areas.