Device and method for determining carbon dioxide content of air

A device for determining carbon dioxide content of air, comprising:

• at least one carbon dioxide-sensitive gas sensor outputting of a measured gas value;
• a temperature control apparatus setting at least two different temperatures during operation of the at least one carbon dioxide-sensitive gas sensor;
• and
• an evaluation apparatus recording at least one measured gas value for each of the at least two different temperatures and evaluating measured gas values to determine the carbon dioxide content of the air at the different temperatures while correcting influence of air humidity by calculating the measured gas values together under an assumption that sensitivity of the at least one carbon dioxide-sensitive gas sensor to carbon dioxide exhibits a different curve with temperature of the at least one carbon dioxide-sensitive gas sensor than the sensitivity to water.

A method for determining carbon dioxide content of air using a carbon dioxide-sensitive gas sensor while correcting for influence of air humidity, comprising:

• operating the carbon dioxide-sensitive gas sensor at at least two different temperatures;
• recording at least one measured gas value at each of the at least two different temperatures;
• and
• determining the carbon dioxide content of the measured gas values at the at least two different temperatures while correcting the influence of the air humidity, by calculating the measured gas values together under an assumption that sensitivity of the carbon dioxide-sensitive gas sensor to carbon dioxide exhibits a different curve with the temperature of the carbon dioxide-sensitive gas sensor than the sensitivity to water.