Relative Humidity


The sensor acquires the relative humidity in the duct via its capacitive humidity sensing element whose electrical capacitance changes as a function of relative humidity.

The electronic measuring circuit converts the sensor’s signal to a continuous 0...10 Vdc signal, corresponding to a relative humidity range of 0...100 %.


(QFR9530 & QAR9530)

The sensor acquires the temperature in the duct via its sensing element whose electrical resistance changes as a function of the temperature.

The signal is delivered to a suitable controller for further handling.

Sensing Element, NTC 10K

Figure 3. Characteristic.

Figure 4. Accuracy.



Resistance value in Ohm
Temperature in degrees Celsius
Temperature differential in Kelvin

See document A6V11937911 for more information about QFR/QAR9530.