Co2 sensor reference value calibration apparatus and method for calibrating reference value of co2 sensor

A method for calibrating a reference value of a CO2 sensor, the CO2 sensor configured to acquire a carbon dioxide concentration in an object space, the carbon dioxide concentration being a relative value with respect to a preset reference value, the method comprising:

• detecting a person in the object space;
• starting introduction of outside air after a person is not detected in the object space;
• setting, as a provisional reference value, a carbon dioxide concentration acquired when a preset first waiting time elapses after the starting of the introduction of the outside air;
• and
• calibrating the reference value of the CO2 sensor by:
• starting the introduction of the outside air after a person is not detected in the object space;
• setting, as the provisional reference value, a carbon dioxide concentration acquired when the preset first waiting time elapses after the starting of the introduction of the outside air;
• comparing a carbon dioxide concentration, which is acquired when a preset second waiting time elapses after the setting of the provisional reference value, with the provisional reference value;
• acquiring the carbon dioxide concentration when the second waiting time elapses after newly setting the acquired carbon dioxide concentration as the provisional reference value, in a case where a change rate of the carbon dioxide concentration is out of a preset allowable range;
• and
• setting a currently set provisional reference value as the reference value in a case where the change rate of the carbon dioxide concentration is in the allowable range.

A method for calibrating a reference value of a CO2 sensor, the CO2 sensor configured to acquire a carbon dioxide concentration in an object space, the carbon dioxide concentration being a relative value with respect to a preset reference value, the method comprising:

• detecting a person in the object space;
• starting introduction of outside air after a person is not detected in the object space;
• setting, as a provisional reference value, a carbon dioxide concentration acquired when a preset first waiting time elapses after the starting of the introduction of the outside air;
• comparing a carbon dioxide concentration, which is acquired when a preset second waiting time elapses after the setting of the provisional reference value, with the provisional reference value;
• acquiring the carbon dioxide concentration when the second waiting time elapses after newly setting the acquired carbon dioxide concentration as the provisional reference value, in a case where a change rate of the carbon dioxide concentration is out of a preset allowable range;
• and
• setting a currently set provisional reference value as the reference value in a case where the change rate of the carbon dioxide concentration is in the allowable range.