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Siemens CO2 Sensor QPA2002D acquires and evaluates the CO2/VOC concentration and converts it to a ventilation demand signal.
It represents the result of maximum selection of the CO2 measuring signal and the filtered VOC measuring signal. With maximum selection, the two demand signals are compared and – depending on the result and the selected VOC sensitivity – delivered as the common air quality demand.
The ventilation demand signal is delivered via output U2 as a 0 to 10 Vdc signal to be fed to the ventilation controller

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