ultrasonic level meters are compact measurement devices including an electroacoustics converter, central processorunit and display module. Using the electroacoustics converter, the level meters transmit the sequence of ultrasonic pulsesthat spread towards the surface level. The converter recuperates refl ected acoustic waves that are subsequently processed inthe electronic module. The intelligent evaluation block fi lters out interfering signals, compares the cleaned received signal withthe false refl ection map (e.g. from mixers, ladders, reinforcement etc.) and selects a suitable refl ection (echo). Based on theperiod during which the individual pulses spread towards the surface level and back and based on the measured temperaturein the tank, the instant distance to the surface level is calculated. According to the level height, the level meter output is set andthe measured value is displayed on the display.