Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-09-11
1980-08-05
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
Specific condition
340616, G01F 2310
Patent
active
042164680
ABSTRACT:
An alarm for signalling the rise of water above a preselected flood indicative danger level. In a preferred embodiment, the alarm is connected across the terminals of the smoke sensing unit of a commercial smoke detecting and signalling device. The alarm includes a pair of elongated conducting wires extending from the smoke sensor terminals to a remote area at which it is desirable to sense a rise in water above the preselected danger level. The ends of the wires at the remote area are fixedly attached to a non-conductive head element so as to provide a separation space between the wires. A rise in the water level to the preselected level serves to bridge the space separating the ends of the wires, closes the circuit and activates the warning signal. In a preferred, alternate embodiment, the wires fixedly attached, in spaced relation, to the wire separating head element, are connected in series with a power supply and a signal. The signal is activated at such times that a rise in the water level bridges the separation space and closes the circuit. In either embodiment, a skirt may surround the head element to prevent the signal from being activated by downwardly running water.
REFERENCES:
patent: 1164882 (1915-12-01), Sommer
patent: 3069671 (1962-12-01), Taylor
Lettvin Norman
Waring Alvin H.
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