Abstract: The invention provides a piezoelectric liquid gauge system in particular for a motor vehicle fuel tank, the system comprising piezoelectric means suitable for transmitting a sound wave in a liquid and for detecting said wave in order to determine the distance traveled by the wave in the liquid on the basis of the time between transmission and reception, said piezoelectric means comprising two distinct active piezoelectric portions suitable respectively for directing a sound wave towards a reference obstacle and a sound wave towards the surface of the liquid to be gauged, the system being wherein the pellet is contained in a housing suitable for being fixed in position in the tank in which measurement is to be performed, the reference obstacle extending over a face of the housing which faces one of the active portions, said face also having a measurement opening placed facing the other active portion and suitable for allowing the measurement sound waves to pass through.

Abstract: The invention provides a piezoelectric liquid gauge system in particular for a motor vehicle fuel tank, the system comprising piezoelectric means suitable for transmitting a sound wave in a liquid and for detecting said wave in order to determine the distance traveled by the wave in the liquid on the basis of the time between transmission and reception, said piezoelectric means comprising two distinct active piezoelectric portions suitable respectively for directing a sound wave towards a reference obstacle and a sound wave towards the surface of the liquid to be gauged, the system being wherein the pellet is contained in a housing suitable for being fixed in position in the tank in which measurement is to be performed, the reference obstacle extending over a face of the housing which faces one of the active portions, said face also having a measurement opening placed facing the other active portion and suitable for allowing the measurement sound waves to pass through.