Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-03-23
1983-05-17
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340585, G08B 2100
Patent
active
043842828
ABSTRACT:
A pair of electrical conductors is positioned in an elongated flexible insulating member and enclosed in an elongated tubular member filled with water or an aqueous solution having a known freezing temperature, the tubular member being sealed at its ends with the electrical conductors in their insulating member extending outwardly of one of the sealed ends and connected with an alarm actuating circuit. A portion of the insulating member is removed from one of the pair of electrical conductors adjacent one end of the same within the tubular member and a portion of the insulating member is removed from the other one of the pair of electrical conductors adjacent the opposite end thereof so that an electrical circuit is completed through the water or aqueous solution in the elongated tubular member and interrupted when the water or aqueous solution freezes.
REFERENCES:
patent: 2632308 (1953-03-01), Engelhardt
patent: 3242473 (1966-03-01), Shivers, Jr. et al.
patent: 3399399 (1968-08-01), Apfelbaum
patent: 3896278 (1975-07-01), Murawski et al.
patent: 4011552 (1977-03-01), Quirke
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