System for measuring e.g. humidity of liquid concrete in movable concrete drum mixer, has evaluating unit including unit for correcting signal of consistency measuring device and/or humidity measuring sensor based on position sensor signals

摘要

The system has a humidity measuring sensor (6) i.e. microwave measuring sensor, determining a filling level by a ratio of a coverage and non-coverage of the humidity measuring sensor with a mixed material. A consistency measuring device i.e. bending rod (3), is arranged at a plate with strain gauges. An evaluating unit (13) includes an unit for correcting a measuring signal of the consistency measuring device and/or the humidity measuring sensor based on signals of a position sensor i.e. 3-axes acceleration sensor. A temperature sensor measures a temperature of the mixed material. Independent claims are also included for the following: (1) a drum mixer (2) a method for measuring a consistency of a mixed material in a drum mixer (3) a method for measuring a filling level of a drum mixer (4) a method for measuring a residual content of a mixed material or residual water in a drum mixer.