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: Aspects of the present disclosure relate to a sensor device and a method for determining properties of a liquid. In one example, a housing having an inner chamber for accommodating a liquid is provided. A circuit board structure is positioned within the inner chamber and has a plurality of rigid circuit board sections, each of which is connected by flexible conductor track carrier sections. The flexible conductor track carrier sections are each arranged between section edges of the rigid circuit board sections. Conductor surfaces are arranged on the rigid circuit board sections. The rigid circuit board sections are arranged parallel to each other and at a distance from each other, so that gaps are formed therebetween. At least one measuring capacitance is formed by the conductor surfaces facing each other across the gaps. The housing has slot receptacles, wherein section edges of the rigid circuit board sections are held in the slot receptacles.

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.

Abstract: A system for detecting the absolute rotational angle of a shaft rotatable more than one revolution includes a drive wheel connected to the shaft to rotate therewith. The drive wheel includes measurement sectors adjacent to one another in a circumferential direction. First and second driven wheels are engaged to the drive wheel. First and second sensors monitor rotational positions of the driven wheels to thereby detect an absolute rotational angle of the shaft. A third sensor monitors a relative angular position of the shaft in relation to a detected one of the measurement sectors to thereby detect the relative angular position of the shaft within one revolution of the shaft. The detected absolute rotational angle of the shaft is refined with the detected relative angular position of the shaft to thereby generate the absolute rotational angle of the shaft with more precision.

Abstract: A system for detecting the absolute rotational angle of a shaft rotatable more than one revolution includes a drive wheel connected to the shaft to rotate therewith. The drive wheel includes measurement sectors adjacent to one another in a circumferential direction. First and second driven wheels are engaged to the drive wheel. First and second sensors monitor rotational positions of the driven wheels to thereby detect an absolute rotational angle of the shaft. A third sensor monitors a relative angular position of the shaft in relation to a detected one of the measurement sectors to thereby detect the relative angular position of the shaft within one revolution of the shaft. The detected absolute rotational angle of the shaft is refined with the detected relative angular position of the shaft to thereby generate the absolute rotational angle of the shaft with more precision.