Patents Assigned to Balluff Sie Sensorick GmbH
  • Patent number: 7509856
    Abstract: A sensor according to the invention has an amplifier that is capacitively loaded vis-à-vis the ground by a container and by a medium contained therein and that has a capacitive feedback that is dimensioned in such a way that the amplifier only oscillates when the critical filling level has not been reached. According to the invention, the capacitive feedback is influenced by the container in such a way that the capacitive load of the amplifier input caused only by the container is countered. In this manner, it is achieved that the sensor responds only to the capacitance of the medium, largely independently of the magnitude of the container capacitance.
    Type: Grant
    Filed: October 16, 2000
    Date of Patent: March 31, 2009
    Assignee: Balluff Sie Sensorick GmbH
    Inventors: Frank Winkens, Wolfgang Frank