The common defense zone classification and definition of building intercom system
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The common defense zones of the alarm system include the access zone, the immediate zone, the internal zone, and the 24-hour zone.
1) Access zone: also known as delay zone After the defense is deployed, the system will provide a delay time for the access zone. After the delay time expires, the delay zone system alarm is triggered. When the delay zone is triggered upon entry, the controller will beep during the entry delay time. As a warning signal for disarming the system, the system must be disarmed within the set delay time. Otherwise, it will alarm. This zone type is suitable for the user's entry/exit keyboard.
2) Instant zone: The alarm will be triggered immediately after the system is armed. There is no delay time.
3) Internal zone: After the system is armed, if the internal zone is triggered before entering the zone, the internal zone will enter the delay state and will not alarm immediately. The delay time of the zone is the same as that of the access zone. If an internal zone is triggered before the access zone is triggered, the system will immediately report an alarm. This zone type is suitable for the user to manipulate the keyboard, such as detectors installed in the entrance, lounge or hall. It is suitable for preventing intrusion in the hall before attempting to arm the system or attempting not to enter or leave the defense area.
4) Perimeter zone: For external doors and/or windows, an alarm will be issued immediately when the zone is triggered.
5) 24-hour defense zone: It will not be affected by arming and disarming. The zone will be triggered and immediately alarmed.
Based on Function:
1. Normally Closed (NC) Solenoid Valve: In this type of valve, the valve is closed when there is no power supply to the solenoid coil. The valve opens when the coil is energized.
2. Normally Open (NO) Solenoid Valve: In this type of valve, the valve is open when there is no power supply to the solenoid coil. The valve closes when the coil is energized.
3. Direct Acting Solenoid Valve: In this type of valve, the solenoid coil directly controls the valve stem, which opens or closes the valve.
4. Pilot Operated Solenoid Valve: In this type of valve, the solenoid coil controls a pilot valve, which in turn controls the main valve.
Based on Construction:
1. Brass Solenoid Valve: These valves are made of brass and are used in applications where the fluid or gas is not corrosive.
2. Stainless Steel Solenoid Valve: These valves are made of stainless steel and are used in applications where the fluid or gas is corrosive.
3. Plastic Solenoid Valve: These valves are made of plastic and are used in applications where the fluid or gas is not corrosive and the valve is not subjected to high pressure.
Based on Application:
1. Solenoid Water Valve: These valves are used in applications where water is the fluid being controlled.
2. Solenoid Air Valve: These valves are used in applications where gas is the fluid being controlled.
3. Steam Solenoid Valve: These valves are used in applications where steam is the fluid being controlled.
4. Fuel Solenoid Valve: These valves are used in applications where fuel is the fluid being controlled.