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Hygromer ^® CS 30: Evaluation Circuit 

The following circuit provides a DC voltage signal corresponding to the raw sensor output. Potentiometer H35 provides an adjustment for tolerances in the sensor nominal capacitance. The output from this circuit can be fed to an amplification circuit (not shown here) with 2 potentiometers (offset and gain) that will be used to adjust / calibrate the signal at two humidity values. Additional circuits may be required for signal linearization and sensor temperature compensation.