Liquid presence and identification sensor

Details Liquid presence and identification sensor Liquid presence and identification sensor

1994-11-09

1996-04-16

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

73304, 73290R, 340603, 340618, 181140, 181124, G01F 2326, G01N 1502

Patent

active

055071783

ABSTRACT:
A sensor for determining both the presence of a liquid in a container or conduit, and identifying its type has a sensor housing body containing both a pair of piezoelectric elements used as the transmitter and receiver of ultrasonic waves directed across a gap therebetween in an ultrasonic liquid presence detecting circuit and a pair of electrodes exposed to any of such liquid in the gap used in a circuit for identifying the liquid type. The liquid identification circuit is either of the capacitance type, which produces a variable amplitude output signal depending on the type of liquid in the gap between the two electrodes, or operates to measure the difference in response time between pulses applied to each of the electrodes with one serving as a reference.

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patent: 5123275 (1992-06-01), Daoud et al.
patent: 5287086 (1994-02-01), Gibb
patent: 5392638 (1995-02-01), Kawahara

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