Abstract: A sensor for detecting a medium, including a capacitive measuring device having at least two electrodes and at least one dielectric, and including an electronic device, which is configured to ascertain a variable regarding and/or dependent on capacitance and to determine an information item regarding the presence of the medium and/or its concentration in view of the ascertained variable; the electronic device being additionally configured to vary a voltage applied between the electrodes, using at least two frequencies, the variable being ascertainable for each of the frequencies, with the aid of the electronic device, a deviation variable regarding a deviation of the variables ascertained for the different frequencies from one another being able to be determined, and the information item being able to be determined in additional view of the deviation variable. In addition, the present invention relates to a method for operating a capacitive measuring device.

Abstract: A sensor for detecting a medium, including a capacitive measuring device having at least two electrodes and at least one dielectric, and including an electronic device, which is configured to ascertain a variable regarding and/or dependent on capacitance and to determine an information item regarding the presence of the medium and/or its concentration in view of the ascertained variable; the electronic device being additionally configured to vary a voltage applied between the electrodes, using at least two frequencies, the variable being ascertainable for each of the frequencies, with the aid of the electronic device, a deviation variable regarding a deviation of the variables ascertained for the different frequencies from one another being able to be determined, and the information item being able to be determined in additional view of the deviation variable. In addition, the present invention relates to a method for operating a capacitive measuring device.

Abstract: A sensor for detecting at least one medium (18), including a capacitive measuring device (10) having at least two electrodes (12) and at least one dielectric (14), and including an electronic device (20), which is configured to ascertain at least one variable regarding and/or dependent on capacitance and to determine at least one information item (22) regarding the presence of the at least one medium (18) and/or its at least one concentration in view of the at least one ascertained variable; the electronic device being additionally configured to vary a voltage applied between the at least two electrodes (12), using at least two frequencies, the at least one variable being ascertainable for each of the frequencies, with the aid of the electronic device, at least one deviation variable regarding a deviation of the variables ascertained for the different frequencies from one another being able to be determined, and the at least one information item being able to be determined in additional view of the at least o