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Device for monitoring a predetermined level of a liquid in a container

  • US 5,836,192 A
  • Filed: 10/16/1996
  • Issued: 11/17/1998
  • Est. Priority Date: 10/17/1995
  • Status: Expired due to Fees
First Claim
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1. A device for monitoring a predetermined level of a liquid in a container comprising an ultrasonic transducer fitted on the outer surface of the container wall at a measurement point situated at the height of the level to be monitored and containing a piezoelectric element arranged in a transducer housing, said piezoelectric element generates, when excited by an alternating voltage pulse having a given transmission frequency, an ultrasonic transmission pulse which is transferred via a diaphragm to the container wall and converts ultrasonic vibrations transferred from the container wall to the ultrasonic transducer into electrical reception signals, said piezoelectric element consisting of a porous piezoelectric ceramic having a type 3--3 connectivity, said transducer housing being at least partially filled with a potting compound, an acoustical insulating member being positioned on the side of the piezoelectric element facing away from said diaphragm providing acoustical insulation between said piezoelectric element and said potting compound and preventing contact between said piezoelectric element and said potting compound.

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