AUTOMATIC FIRE ALARM SYSTEM

• Main Authors: TAKANO MISAO, FUJIKI HITOSHI, HIRATA KOJI
• Format: Patent
• Language: English
• Published: 14.02.1997
• Edition: 6
• Subjects: ALARM SYSTEMS; ORDER TELEGRAPHS; PHYSICS; SIGNALLING; SIGNALLING OR CALLING SYSTEMS

PROBLEM TO BE SOLVED: To discriminate the alarm from an emergency transmitter only by providing a sensor line by discriminating the alarm operation of a fire sensor from the emergency operation of the transmitter, in accordance with the detection voltage of a voltage discrimination circuit which discriminates the voltage level generated at the time of operation of the emergency transmitter provided at the signal terminal of a fire receiver. SOLUTION: A fire sensor S is connected to between a signal terminal L of a fire receiver J and a common terminal C, and an emergency transmitter P having an emergency button (b) is connected to the sensor line led out from the signal terminal L and the common terminal C in parallel with the fire sensor S. A voltage discrimination circuit 1 which discriminates the voltage level at the time of the operation of the emergency transmitter P, is provided at the signal terminal L of the fire receiver J, and the alarm operation of the fire sensor S and the emergency operation of the emergency transmitter P are discriminated. A fire sensor alarm detection part 2 lights or flickers an operation indication lamp Lk at the time of the alarm of the fire sensor S, and a transmitter response detection part 3 lights or flickers an operation indication lamp Lh at the time of the operation of the emergency transmitter P.