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

Details Device for monitoring a predetermined level of a liquid in a con Device for monitoring a predetermined level of a liquid in a con

1996-10-16

1998-11-17

Gutierrez, Diego F.F.

Measuring and testing

Liquid level or depth gauge

340621, 367908, G01F 2328

Patent

active

058361928

ABSTRACT:
For monitoring a predetermined level of a liquid in a container an ultrasonic transducer is fitted on the outer surface of the container wall at a measurement point situated at the height of the level to be monitored. The ultrasonic transducer contains a piezoelectric element which 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 which converts ultrasonic vibrations transferred from the container wall to the ultrasonic transducer into electrical reception signals. So that the piezoelectric element for given dimensions can be operated in a large frequency range, and so that a good adaptation to the diaphragm is achieved, the piezoelectric element consists of a porous piezoelectric ceramic having a type 3--3 connectivity.

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W. Wersing et al. (1986). Dielectric, Elastic and Piezoelectric Properties of Porous PZT Ceramics. Ferroelectrics, Vol. 68, pp. 77-79. Gordon and Breach Science Publishers S.A.

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