The maintenance-free microprocessor-controlled on-wall sensor AERASGARD® AFTM-CO2 - W with automatic and manual calibration is used for detecting the overall room climate. It measures CO2 within a range of 0...2000 ppm or 0...5000 ppm, air quality (VOC) in one of three sensitivity levels that can be selected LOW / MEDIUM (default) / HIGH, temperature within a range of –35...+80 °C as well as relative ambient humidity of 0...100 % r.H. The measured values are converted into standard signals of 0 -10 V or 4...20 mA (selectable via DIP switches). As an option, the measured values can be shown continuously in the illuminated display.