Ultrasonic level sensing device

Measuring and testing – Liquid level or depth gauge

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Details

340 1L, G01F 2328, G01S 966

Patent

active

040634574

ABSTRACT:
An ultrasonic sensing device for sensing the presence or absence of a liquid at various predetermined levels, especially in storage tanks, bilges and the like, employing multiple high frequency transducer assemblies having transmitting and receiving means enclosed in a sound conductive, e.g. metallic housing of special design minimizing "cross-talk" associated with means responsive to signals received above a selected minimum response level, the system being characterized by an on-off response provided by signal attenuation to a value less than said minimum response level in the absence of the liquid.

REFERENCES:
patent: 2668365 (1954-02-01), Hogin
patent: 2746480 (1956-05-01), Hildyard
patent: 2883861 (1959-04-01), Valkenburg et al.
patent: 3010318 (1961-11-01), Mongan
patent: 3220258 (1965-11-01), Rod
patent: 3520186 (1970-07-01), Adams et al.
patent: 3748635 (1973-07-01), Phillips et al.
patent: 3906791 (1975-09-01), Lynnworth

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