1. Components of the automatic fire alarm system. A typical automatic fire alarm system will have 3 main components as follows: * Input devices:
- Emergency switch (emergency push button)
– Detectors: smoke alarm, heat alarm, gas alarm, fire alarm… * Output device:
- Alarm system bells, sirens.
- Secondary display panel.
- Automatic phone dialer - Alarm lights, exit lights. * Fire alarm system center: Designed in cabinet form, including main devices
- 1 control mainboard, modules, 1 battery, 1 variant.
2. Nguyên lý hoạt động của hệ thống báo cháy tự động.
Hệ thống báo cháy tự động thường có 3 trạng thái làm việc: trạng thái thường trực (khi không có cháy), trạng thái báo cháy và trạng thái sự cố.
* Permanent state: in this mode, the fire alarm center always has a working check signal to the devices in the system and at the same time the addressable fire detectors, modules... also have response signals to the center. . Periodically, over time (depending on setting), the center will print the status of the system and information about equipment that needs maintenance. In the circuit there is always current Io flowing through.
*Fire alarm status: When fire occurs in protected areas, changes in the fire's environmental factors (temperature, smoke, light) will affect the fire detectors. When these factors reach the working threshold, the fire detectors will work to create a signal transmitted to the center (including the fire alarm signal and the fire alarm device's address signal). At the fire alarm center, the transmitted signal processing activities will take place according to the installed program to give a signal to notify the fire area through the central speaker and LCD liquid crystal screen. At the same time, the corresponding peripheral devices will activate to signal the fire alarm and perform the proposed tasks.
* Fault status: In case the fire alarm center has an additional monitoring function installed for other devices, when there is a problem, the status of the device will change (For example: the fire pump operates, the switch active flow...), the system will switch to notify the device that needs to monitor the status change. Information about this change will be displayed on the center's crystal display. This mode will also end automatically if the devices to be monitored return to their normal positions. 3. Technical requirements
The technical requirements of the automatic fire alarm system are specified according to Vietnamese standard TCVN 5738 - 2001 ''Automatic fire alarm system - Design requirements''
automatic fire alarm system
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