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Recently, the CO2 sensor is used in various fields like industry, agriculture, firefighting, air quality system, and so on. The contact type CO2 sensors have been used extensively because of a very low energy consumption and small size. However, they have a negative side such as short lifetime and poor gas selectivity. On the other hand NDIR CO2 sensors have a long lifetime and good gas selectivity. In this paper, we study about NDIR CO2 sensor temperature compensation and comparison of reflector materials chrome and gold by practical implementation.