The real CO2 level in the air bang is transmitted by the CO2 duct sensor with infrared. The sensor has a self-calibration algorithm and is therefore stable over a lifetime of 15 years. The sensor has standard output signals 0-10V and 4-20 mA, which can be set by means of jumpers. The simple and robust design ensures easy installation. The test port can be rotated 180 ° to achieve an optimal flow. For permanent protection, the probe tip is equipped with a replaceable filter.