AKCO2 is designed for ventilation systems. According to indoor carbon dioxide levels to adjust the interior requirements for the new air volume. According to the number of indoor people and the demand of the new air volume to do proper ventilation, not only can ensure indoor air fresh, but also can save energy. Easy to install, simple to operate, low cost, AKCO2 series are infrared ray CO2 transmitters. They specialized design for building automation and other places where CO2 content need to be tested. Detect Range: 0-2,000ppm CO2. Linear output:0-10V , 4-20mA, RS485 AKCO2 series products is good for saving energy and improving the quality of the air.