Patent ID: 8117910

Claim:
An apparatus for capacitive determining and/or monitoring of fill level of a medium in a container, comprising: at least one probe unit; at least one control unit, which supplies the probe unit with a drive signal; and at least one evaluating unit, which receives from said probe unit at least one response signal, and which determines from the response signal at least one statement concerning fill level, wherein: the response signal has at least one amplitude and one phase relative to the drive signal and/or relative to a reference signal; said evaluating unit ascertains, from the response signal and/or from the time behavior of the response signal, a statement concerning accretion on the probe unit; stored in said evaluating unit are at least a first and a second formula, or a first and a second evaluating algorithm; in case accretion lies below a predetermined limit value, said evaluating unit determines the statement concerning fill level from the response signal via the first formula and/or via the first evaluating algorithm; in case accretion lies above a predetermined limit value, said evaluating unit determines the statement concerning fill level from the response signal via the second formula and/or via the second evaluating algorithm; and said evaluating unit ascertains a statement concerning accretion from a combination of phase and amplitude of the response signal.