Patent ID: 6427532
Filing Date: 2002-08-06
Classification: G01F,G01N

Abstract:
A device for measuring a fill level of a liquid in a container, comprising:an ultrasonic sensor operatively arranged for generating an ultrasonic signal in the liquid and for receiving a first reflection of the ultrasonic signal reflected in the region of the fill level of the liquid in the container; a measuring reflector arranged in a bottom of the container at a spacing upstream of said ultrasonic sensor, wherein said ultrasonic sensor receives a second reflection of the ultrasonic signal reflected from the measuring reflector; and an evaluation unit operatively connected to said ultrasonic sensor for determining the fill level of the liquid in the container by comparing a first echo time comprising the time between generating the ultrasonic signal and receiving the first reflection and a second echo time comprising the time between generating the ultrasonic signal and receiving the second reflection.