Head office of detection of carbon monoxide (CO) and dioxide of nitrogen (NO2) of 2 zones, with two levels of alarm for zone. 3 exits of relay for zone (two of control extraction / ventilation and one of general alarm). Designed for applications where CO'S concentrations could be accumulated and / or NO2 and need to be controlled, to protect the persons. Certificate according to norm JOINS 23300. Indicator by means of display of CO'S concentration in ppm (Sensibility from 0 to 300 ppm) showing him the reading of the detector with the level of detection mas highly and the number corresponding to the above mentioned detector. Compatible with the detectors of the range ME300, with possibility of combining detectors of carbon monoxide and dioxide of nitrogen in the same zone. Rapid time of response.