Method and device for monitoring filling level of medium in container

The invention relates to a method for determining and/or monitoring at least one process variable of a medium (3) in a container (2) by means of at least one measuring probe (1) having at least two electrodes (4, 5), comprising the following method steps: in a first operating mode (a): applying a first excitation signal (A1) to a first electrode (4) of the measuring probe (1), wherein the second electrode (5) of the measuring probe (1) is used as a receiving electrode, and wherein the first received signal is received by the measuring probe (1),-in a second operating mode (b), applying a second excitation signal (A2) to the first electrode (4) of the measuring probe (1), and wherein the second electrode (5) of the measuring probe (1) is used as a ground electrode, and wherein the second received signal is received by the measuring probe, and-determining at least one process variable on the basis of the first received signal (E1) and/or the second received signal (E2). The invention also relates to a device (V