USD26.39
CCS811 measures indoor eCO2 and TVOC density. eCO2 stands for equivalent CO2. It indicates the concentration of CO2 that will cause the same level of radiative forcing as the measured ambient air does. TVOC stands for total volatile organic compounds. It is a measurement of the gasses emitted from toxins and chemicals.
Working Principle
CCS811 is a Metal Oxide Sensor. It measures the resistance of a sensitive layer which is exposed to air. The sensitive layer is heated up.
When it is in clean air, the sensitive layer absorbs oxygen in air. Oxygen attracts free electrons. As a result, there is less flow of electrons in the sensitive layer and the resistance will be high.
When it is in polluted air, oxygen is reduced by the pollutants. Electrons are released and there is more flow of electrons in the sensitive layer. The oxidation will lower the resistance.
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