Contact type liquid level sensing system

Details Contact type liquid level sensing system Contact type liquid level sensing system

1986-07-14

1992-10-13

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

367 93, 73290V, G08B 2100

Patent

active

051554720

ABSTRACT:
A liquid level sensing device having a transducer in which successive bursts of pulses of ultrasonic energy are transmitted across a gap. When liquid is present in the gap the bursts of pulses are received and signal processed to indicate the presence of liquid in the gap.

REFERENCES:
patent: 3625058 (1971-12-01), Endress et al.
patent: 3748635 (1973-07-01), Phillips et al.
patent: 3863244 (1975-01-01), Lichtblau
patent: 4010458 (1977-03-01), Kopfli
patent: 4202049 (1980-05-01), Wetzel
patent: 4299114 (1981-11-01), Silvermetz et al.
patent: 4482889 (1984-11-01), Tsuda et al.
patent: 4540981 (1985-09-01), Lapetina et al.
patent: 4630245 (1986-12-01), Dam

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