CMD503 Carbon monoxide control panel of 3 zones. 32 detectors per zone. 2-wire installation without polarity, maximum distance of 2 km. 3 programmable level relays (extraction 1, extraction 2 and alarm). The relays can be configured for activation with a fault. Two shooting modes, standard (by value of each detector) or by the real average of the whole area. Test mode for the maintenance of the installation. Optional: TRMD-500 or TRMD-501 card allows the control of a speed regulator connected to an engine achieving energy efficiency and reduction of noise and vibrations. Housing made of ABS plastic, with possibility of being recessed.