Liquid level sensor

Details Liquid level sensor Liquid level sensor

1980-10-24

1982-02-16

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

73290V, G08B 2100, G01F 2300

Patent

active

043161839

ABSTRACT:
A high liquid level sensor comprising a tubular probe, with a peripheral wall (6), and arranged to be suspended in a liquid container. An ultrasonic signal is transmitted around the wall (6) from a transmitting transducer (12) potted in a block (11), which is bonded to the inner surface of the wall, to a receiving transducer also potted in the block. A detector circuit connected to the receiving transducer via a lead (10) discriminates between the signal level when the probe is immersed in gas and the lower signal level when the probe is immersed in liquid, and provides a corresponding switched output.

REFERENCES:
patent: 2713263 (1955-07-01), Turner
patent: 2787160 (1957-04-01), Van Valkenburg
patent: 3266311 (1966-08-01), Andreasen et al.
patent: 4118983 (1978-10-01), Brazhnikov
patent: 4213337 (1980-07-01), Langdon

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