2-zone carbon monoxide detection center expandable to 3 by MMD-509 module. Capacity of up to 32 detectors per zone. 2-wire installation without polarity, maximum distance of 2 Km. It has 3 programmable level relays (extraction 1, extraction 2 and alarm). Relays can be set to be activated in a fault. It has two forms of activation: standard (by value of each detector) or by the real average of the entire area. It has a test mode for the maintenance of the installation. Optional: TRMD-500 or TRMD-502 card, allows the control of a speed regulator connected to a motor achieving energy efficiency and reduction of noise and vibrations. ABS plastic housing, with the possibility of being recessed. Dimensions 439 x 268 x 112 mm. Power supply at 230 Vac. Possibility of connecting 2 BTD-1207 batteries (not included). UNE 23300:1984 certificate.