Method and assembly for overfill detection in liquid level sensi

Details Method and assembly for overfill detection in liquid level sensi Method and assembly for overfill detection in liquid level sensi

1998-04-06

2000-11-07

Williams, Hezron

Measuring and testing

Liquid level or depth gauge

7386127, 340621, G01F 2300, G01S 968

Patent

active

061420158

ABSTRACT:
Sensing the level of a liquid in a vessel by the pulse transit time technique is done by means of an ultrasonic transducer mounted above the highest-permissible level in the vessel which emits ultrasonic transmission pulses to the surface of the liquid and receives the ultrasonic echo pulses reflected from the liquid surface. The level in the vessel is established from the transit time of the ultrasonic pulses. To detect an overfill when the ultrasonic transducer is immersed in the liquid the decaying output signal of the ultrasonic transducer generated by the ringing of the ultrasonic transducer following the end of the each ultrasonic transmission pulse is analyzed. In this arrangement the fact is exploited that due to the better coupling of the ultrasonic transducer to the liquid than to air the ringing duration is shorter when the ultrasonic transducer is covered by the liquid.

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