| 摘要 |
A fire detector is provided to minimize power consumption by constituting the semi-permanent fire detector with a bridge temperature detecting circuit composed of a transistor, a resistor, and a condenser. A fire detector includes a bridge temperature detecting part(31) and an alarm controlling part(32). In the bridge temperature detecting part, a circuit composed of a transistor(Q1), resistors(R4,R6), and a condenser(C5) and a circuit composed of a transistor(Q2), resistors(R5,R7), and a condenser(C6) are connected in parallel through a resistor(R3), and a semi-fixed resistor(VR1) is connected to the resistor in series. The transistor is arranged inside of a fire detector base as a sensor detecting inner temperature, and the transistor is arranged outside of the fire detector base as a sensor detecting outer temperature. |
