Abstract: An apparatus for determining the filling level of a product in a container with a transmission unit which generates high-frequency signals and emits them at a predetermined pulse repetition frequency in the direction of the surface of the filled product. The signals are reflected by the surface of the filled product and are received by a receiving unit. A delay circuit transforms the high-frequency signals/reflected signals into low-frequency signals in accordance with a predetermined translation factor and with an evaluation unit which determines the filling level of the product in the container on the basis of the delay time of the signals. The delay circuit includes: a transmission oscillator; a sampling oscillator; a digital sampling circuit; and a closed-loop/open-loop control unit.

Abstract: An apparatus for determining the filling level of a product in a container with a transmission unit which generates high-frequency signals and emits them at a predetermined pulse repetition frequency in the direction of the surface of the filled product. The signals are reflected by the surface of the filled product and are received by a receiving unit. A delay circuit transforms the high-frequency signals/reflected signals into low-frequency signals in accordance with a predetermined translation factor and with an evaluation unit which determines the filling level of the product in the container on the basis of the delay time of the signals. The delay circuit includes: a transmission oscillator; a sampling oscillator; a digital sampling circuit; and a closed-loop/open-loop control unit.

Abstract: This invention relates to an apparatus for the determination of the fill state of solid or liquid material in a container with a signal-generating/transmitting unit, a receiving unit, a time-delay circuit which transforms the high-frequency signals into low-frequency signals, and an evaluating unit.