Fail-safe high temperature alarm

Details Fail-safe high temperature alarm Fail-safe high temperature alarm

1986-09-05

1988-07-26

Crosland, Donniel L.

Communications: electrical

Condition responsive indicating system

With particular system function

340501, 340509, 340588, 340664, 379378, 374100, 374111, 236 91F, 236 91G, 165 111, G08B 2900

Patent

active

047603798

ABSTRACT:
A temperature sensor located at a region being monitored controls an output switch that in one position when ambient temperature is below a predetermined temperature applies current to only a first loop circuit and in another position when ambient temperature is at or above the predetermined temperature applies current to only a second loop circuit. Currents in the first and second loop circuits are measured by ferrods to determine whether an over-temperature condition at the region monitored has taken place. An alarm circuit connected to outputs of the ferrods generates an alarm signal in response to a negative transaction of current in the first loop circuit or a positive transition of current in the second loop circuit. A failure in either loop circuit accordingly is insufficient to disable the system. A solid state timer periodically opens the second loop circuit to repeat the alarm signal when the second loop circuit is closed until corrective action is taken.

REFERENCES:
patent: 2367509 (1945-01-01), Knowlton
patent: 2645765 (1953-07-01), Bixby
patent: 2691158 (1954-10-01), Wittenberg
patent: 3159825 (1964-12-01), Bianchi et al.
patent: 3889069 (1975-06-01), Ault
patent: 4240077 (1980-12-01), Hughes
patent: 4285023 (1981-08-01), Kalivas

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