THERMAL FIRE SIGNAL DEVICE Russian patent published in 2009 - IPC G08B17/06 

FIELD: fire safety.

SUBSTANCE: essence of this technical decision is that thermal fire signal device consists of the LED display, seven resistors, three condensers, two diodes, two transistors, two input terminals and thermal element and is different for the base of the second transistor connected to the collector of the first transistor emitter thereof is connected to the second input terminal by the seventh resistor. Due to the use of other connections between the first and second resistors and also the seventh resistor the offered thermal fire signal device provides the increase of the input resistance of the first transistor stage which allows the use of the condenser of the less capacity as the third condenser with the low-repeatablity temperature relations.

EFFECT: increases the temperature stability of the time of the fire indication condition when maintaining all the function of the thermal signal device in accordance with the regulatory documents.

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