The invention relates to a sensor for detecting an object. The sensor includes a probe electrode for forming a measuring capacitance with the object to be detected, a charging generator for generating an alternating charging voltage, wherein the probe electrode is charged by means of the alternating charging voltage, an amplifier for amplifying a voltage across the measuring capacitance, wherein the amplifier includes a first supply connection and a second supply connection, electronic means for processing signals outputted at an output of the amplifier to form at least one output signal and at least one sensor output for outputting the at least one output signal. According to the invention, the sensor is characterized in that a DC voltage in the form of a second supply voltage is connectable to the second supply connection, and that a first supply voltage having an AC voltage portion is connectable to the first supply connection, wherein a supply voltage generator is available for generating the DC voltage portion. The invention also relates to a method for detecting an object.