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It is equipped with voltage/current analog output and with an output relay. The analog output value is proportional to the concentration of CO₂. The measuring of CO₂ works on the principle of infrared radiation attenuation dependence on the CO₂ concentration in the air. Built-in electronics converts the infrared radiation attenuation changes in the measuring cell to the analog output. The sensor is capable to measure the CO₂ in the air concentration in the range of 370 up to 2000 ppm.