Method and device for monitoring the filling level of a medium in a container

A method for determining and/or monitoring at least one process variable of a medium in a containment using a measuring probe having two electrodes, the method comprising:

• in a first operating mode, supplying a first electrode of the measuring probe with a first excitation signal, wherein a second electrode of the measuring probe serves as a receiving electrode, and wherein a first received signal is received by the measuring probe;
• in a second operating mode, supplying the first electrode of the measuring probe with a second excitation signal, wherein the second electrode of the measuring probe serves as a ground electrode, and wherein a second received signal is received by the measuring probe;
• and
• determining the at least one process variable based on the first and/or second received signals.

A device for determining and/or monitoring at least one process variable of a medium in a containment with at least one measuring probe, wherein the at least one measuring probe has at least two electrodes and wherein device is embodied to:

• in a first operating mode, supply a first electrode of the measuring probe with a first excitation signal, wherein a second electrode of the measuring probe serves as a receiving electrode, and wherein a first received signal is received by the measuring probe;
• in a second operating mode, supply the first electrode of the measuring probe with a second excitation signal, wherein the second electrode of the measuring probe serves as a ground electrode, and wherein a second received signal is received by the measuring probe;
• and
• determine the at least one process variable based on the first and/or second received signals.