Carbon dioxide sensor can effectively measure indoor carbon dioxide concentration, and NDIR CO2 sensor is often used for carbon dioxide monitoring in factories, workshops, greenhouses, clean rooms and other industries and agriculture, as well as ventilation control and environmental quality in homes, villas, office buildings, conference rooms, classrooms and other fields. The scope of application includes monitoring of CO2 concentration in the production of industrial, agricultural and residential environments and the use of carbon dioxide gas units.