The Macurco CX-12 line voltage dual monitor detects Carbon Monoxide and Nitrogen Dioxide in commercial facilities. It can be used as a stand-alone detector, controller and as an analog transducer for use with Macurco control panels, fire panels and other systems – ETL Listed The Macurco 12 Series fixed gas detectors provide life-saving solutions aimed to protect people and property. These fixed gas detectors are designed for low level detection, mitigation, and notification. Let these detectors do the work for you by shutting off valves, turning on fans, engaging horns and strobes, and provide notification to fire panels and building automation systems when gases reach key limits.