| 摘要 |
PURPOSE: A fire sensor monitoring device is provided to monitor disconnection of a wire line between a fire sensor and a defense control device and thoroughly cope with an emergency. CONSTITUTION: The device comprises an end resister, a sensor connector, a power supply, an amplifier, a comparing detector, and a controller. The resister and the sensor are connected to the wire line in parallel, and the connector is connected thereto. The power supply supplies direct current to the sensor to generate sensor current in disconnection of the sensor, wherein voltage generated according to the sensor current is detected and amplified by the amplifier. The comparing detector generates a signal informing disconnection in comparison with a first and a second reference voltages, and the controller gives an alarm.
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