Method for level measurement according to the transit time principle

摘要

Method for measuring a filling level (L) of a filling material (1) in a container (3) with a filling level measuring device (5) operating according to the transit time principle which sends measuring signals (S) in the direction of the filling material (1) into the container (3) during measuring operation and by means of which the signal portions (E) reflected back in the container (3) derive echo functions (A (t)) representing the amplitudes (A) of the signal components (E) as a function of their transit time (t), with the help of a table whose rows discrete levels (L) and their columns discrete transit times (t) correspond, and derived in the past derived echo functions (A (t)) information on maturities (t) of reflections on reflectors located in the container (3) reflectors maxima are stored as historical measuring points in each line whose line index corresponds to the associated level (L) that even then delivers reliable results when the By changing the table on the basis of current echo functions (A (t)) derived during the current measuring operation, current measuring points derived from current echo functions (A (t)) in that row are stored, whose line index corresponds to the level determined by the level meter associated plausibility, based on the historical and the current measurement points a plausibility check is made, and deleted due to the Plaubilitätskontrolle as implausible historical and / or current measurement points and all other current measurement points as historical measurement points in the table be taken over.