Working principle of conventional automatic fire alarm system
+ Normally, the fire alarm system is in the standing mode, in this mode there is always an I0 signal running in the circuit to check the normal operation of the equipment in the system to detect problems and damage, if any. .
+ When fire occurs in protected areas, changes in fire environment factors (temperature, smoke concentration, flame) will affect the fire detectors. If these factors reach a certain value (the working threshold of the fire detectors), the detectors will work to generate signals transmitted to the fire alarm center through the signal wire and cable system. At the fire alarm center, there will be signal processing activities to automatically convert the operating mode of the system to the fire alarm mode. In this mode, the fire alarm center will emit an alarm signal. , corresponding indications (such as bells, whistles, lights) and notification of fire locations and fire zones. At the same time, the fire alarm center can give control signals to other peripheral devices.
+ The fire alarm system is in the standing mode of fire, but there is a problem (parts failure) such as broken wire, battery failure, output failure, the fire alarm center will immediately notify the problem. If the system is having trouble and there is a fire in the protected rooms, the system will also send out a fire alarm to everyone.
+ After the end of the test or after the fire alarm, we need to restore the working state of the system, return the system to the standing state.
Working states of automatic fire alarm system:
+ Permanent status
+ State of fire alarm
+ Crash status
Diagram - principle of conventional automatic fire alarm system Present the diagram, working principle of conventional automatic fire alarm system.
Fire fighters center; 7. Fire alarm button;
Signal cable ; 8. General fire alarm bells and lights;
Technical box ; 9. Area fire alarms and bells;
Fire detectors; 10. Signal to the fire brigade
End-of-line impedance; 11. Peripheral device control signal;
Signal wire; 12. AC, DC RED
(The above material is updated from the University of Fire Protection)
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