The Macurco CD-6 is a low voltage, dual relay Carbon Dioxide (CO2) detector. The CD-6 has 4-20 mA output, buzzer and digital display options. The CD-6 provides CO2 detection and automatic ventilation control for conference rooms, classrooms, meeting halls or similar applications. It is capable of detecting from 0 to 2,000 ppm of Carbon Dioxide in commercial environments. Can be used standalone, with the Macurco DVP-120 Detection and Ventilation Control Panel, other fire/security panels or building automation systems.