Patent ID: 7826309
Filing Date: 2010-11-02
Classification: G01F,Y10S

Abstract:
1. A method for measuring a fill level of a fill substance in a container and for monitoring at least one predetermined fill level (L MIN , L MAX ), using a fill level measuring device working according to a travel-time principle, comprising the steps of: sending, in each measuring cycle, transmission signals (S) toward the fill substance and receiving their echo signals (E); deriving an echo function from the echo signals (E) which represents an amplitude of the echo signals (E) as a function of travel-time (t) for determining the exceeding or falling beneath of the predetermined fill levels (L determining a measure for the area under the echo function in a region (I, II) of particular travel-time (t determining the fill level, based on the echo signals (E), according to a first evaluation, and based on the echo signals (E), according to a second evaluation independent of the first evaluation; and observing whether the fill level exceeds or falls beneath the predetermined fill level (L it is detected that the fill level exceeds the particular predetermined fill level (L it is detected that the fill level falls beneath the particular predetermined fill level (L said measure corresponds to an integral over the echo function in the region (I, II) of the particular travel-time (t