Bottom up contact type ultrasonic continuous level sensor

Measuring and testing – Liquid level or depth gauge

Reexamination Certificate

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Reexamination Certificate

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08061196

ABSTRACT:
An ultrasonic sensor for measuring the level of liquid in a vessel has an elongated tubular probe, a tube within the probe, and a transducer that converts electrical energy to ultrasonic energy mounted at or near one end of the tube so as to transmit ultrasonic energy horizontally across the probe. An element having a surface that reflects ultrasonic energy is at an angle, preferably of about 45°, to the probe longitudinal axis opposite to an ultrasonic energy emitting part of the transducer to reflect ultrasonic energy received from the transducer upwardly in the probe to an air-liquid interface from which it is downwardly reflected to the angled reflector element that directs the energy reflected from the interface back to the transducer for conversion to an electrical signal that is used by an electronic module to measure the liquid level in the probe which is the liquid level in the vessel.

REFERENCES:
patent: 5119676 (1992-06-01), Bower et al.
patent: 2005/0284217 (2005-12-01), Miyagawa et al.
patent: 2009/0038394 (2009-02-01), Zachmann
patent: 11-153471 (1999-06-01), None
patent: 2004-294073 (2004-10-01), None
patent: 2004-340911 (2004-12-01), None
patent: 2010180 (1994-03-01), None

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