Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-10-25
1987-06-16
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
73 19, 73 61R, 128660, 128DIG13, 367908, 604 65, G08B 2100
Patent
active
046739270
ABSTRACT:
An apparatus for detecting and controlling the presence of a gaseous fluid in relation to a predetermined level of liquid in a vessel, being of the ultrasonic type and comprising a pair of piezoelectric transducers, namely a transmitter and a receiver, capable of being disposed on opposite walls of the vessel. An oscillator provides an electric ultrasonic frequency signal to the transmitter transducer and a comparator compares the electric signal supplied by the receiver transducer with a reference signal for triggering an alarm signal when the disparity between the signals being compared exceeds a predetermined value.
The apparatus moreover comprises processing means which periodically interrupt the electric signal sent to the transmitter transducer and which check the presence of an alarm at the output of the above mentioned comparator.
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Cianciavicchia Domenico
Franceschini Stefano
Honor Robert S.
Hospal A.G.
Jewell Walter F.
Myer Daniel
Rowland James L.
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