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What is the operating principle of the CO2 sensor?

The CO2 sensor is a chemical optical sensor utilizing the acidic nature of CO2 for detection. It consists of a gas-permeable membrane in which a pH-sensitive luminescence dye is immobilized together with a buffer and an inert reference luminescent dye. CO2 permeating into the membrane changes the internal pH of the buffer. With this changes the luminescence of the pH-sensitive dye. Together with the inert reference dye internal referencing is made for detection of the luminescence lifetime of the sensor. The measurement signal detected by the pCO2 mini correlates to the partial pressure of CO2 ambient.

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