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The carbon dioxide gas sensor measures gaseous carbon dioxide levels by detecting the quantity of IR radiation absorbed by carbon dioxide molecules. The sensor employs a hot metal filament that acts as an IR source to generate IR radiation. The IR source is located at one end of a sensor tube, and another end is provided with an IR sensor.
1 Arterial Carbon Dioxide. 2  Although the peripheral chemoreceptors can sense changes in the partial pressures of arterial carbon dioxide, their response does not appear to be nearly as influential as that of the central chemoreceptors which are the principal sensors of arterial CO 2.