FIRE ALARM Russian patent published in 2007 - IPC G08B17/06 

FIELD: fire alarms, possible use in fire signaling systems for detecting increased environment temperature exceeding the predetermined limit value.

SUBSTANCE: thermal fire alarm contains light diode indicator, six resistors, three capacitors, diode, two input clamps, two transistors, thermal sensor. Technical result is achieved due to introduction of second diode and seventh resistor. In suggested thermal fire annunciator due to usage of newly introduced elements and new connections, preservation of "Fire" condition is ensured after end of effect of reverse direction voltage impulses, which are created by a group of receiving and controlling devices in fire alarm loops.

EFFECT: increased efficiency.

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