Patent ID: 7965087

Claim:
A method for ascertaining and monitoring fill level of a medium in a container utilizing a fill-level measuring device, wherein, according to the technique of time-domain reflectometry, high-frequency measuring signals are guided via at least one measuring probe in the direction of the medium, reflected on at least one interface of the medium as wanted echo signals or on disturbance locations as disturbance echo signals, and received, the method comprising the steps of: forming a reference echo signal in a measurement-inactive region of the fill-level measuring device either from a transmission pulse of the high-frequency measuring signal or from one of the disturbance echo signals; forming, from the wanted echo signals, the reference echo signal and the disturbance echo signals, a current echo curve as a function of travel time or traveled distance; locating, at least from a first disturbance echo signal and the reference echo signal, which are caused in a measurement-inactive region of the fill-level measuring device, a base point in the current echo curve; and ascertaining fill level from distance of a wanted echo signal, formed in a measurement-active region of the fill-level measuring device, from the base point in the current echo curve.