Abstract: Aspects of the present disclosure relate to a sensor device and a method for detecting properties of a liquid. In one example, the liquid is accommodated in an inner chamber. A capacitor arrangement in the inner chamber has spaced, opposing capacitor surfaces so that at least part of the liquid accommodated in the inner chamber is arranged between the capacitor surfaces. An evaluation device for supplying an output signal A depending on a capacitance value of the capacitor arrangement includes an excitation circuit and an evaluation circuit. The excitation circuit has at least one measuring resistor and an AC voltage source configured to apply an AC voltage to a series circuit including the measurement resistor and the capacitor arrangement. The evaluation circuit has an output supplying the output signal A by measuring a voltage across the capacitor arrangement.

Abstract: The invention relates to a sensor device and a method for detecting properties of a liquid. The liquid is accommodated in an inner chamber 14. A capacitor arrangement 22, 26 in the inner chamber has spaced, opposing capacitor surfaces 24a, 24b, 28a, 28b so that at least part of the liquid accommodated in the inner chamber 14 is arranged between the capacitor surfaces 24a, 24b, 28a, 28b. An evaluation device 30 for supplying an output signal A depending on a capacitance value C1, C2 of the capacitor arrangement 22, 24 comprises an excitation circuit 32 and an evaluation circuit 34. The excitation circuit 32 has at least one measuring resistor R1, R2, R1a, R1b and means for applying an AC voltage to a series circuit consisting of the measurement resistor R1, R2, R1a, R1b and the capacitor arrangement 22, 24. The evaluation circuit 30 has means for supplying the output signal A by measuring a voltage U1, U2 across the capacitor arrangement 22, 24.