Burglar Alarm Systems
Burglar alarm systems are normally 12V DC based systems

a) Conventional devices are cost effective, and are normally used when the number of detectors involved
is less. The premises that needs to be secured, is divided into separate zones, (Usually 4,8,16,32 zones, etc.,)
depending on the capacity of the Control Panel. A single detector or several detectors in a serial loop are
connected to each of these physical zones.

In Microprocessor based panels, it is also possible to label each zone depending on the area it is supervising.
In case of an intrusion, the panel indicates the precise area, where the intrusion occurred, with the precise time and date
Addressable Systems are more complex systems, where each detector is provided with a unique digital address. Hence many detectors connected in parallel, on a single loop, can still be identified individually. Typically, a loop can accommodate around 99 to 127 detectors. This system also simplifies cabling to a great extent.

Any sensor, detecting intrusion, will send an alarm signal, preceded by its relevant digital address to the control panel. A label providing the location of the detector can be programmed corresponding to each address. In case of an intrusion, the panel indicates the precise point, where the intrusion occurred, with the precise time and date stamp. Several keypads with different unique addresses, can be connected.

c) Wireless devices communicate with each other through means of radio waves, usually in the frequency range of 900MHz. All detectors are provided with batteries, and a wireless transmitting device, in addition to its basic sensor circuit. The main control Panel, includes a wireless receiver unit, and is separated into different channels to receive signals from each detector separately. When armed, the Control Panel activates the Siren upon receiving an alarm signal
from any one of the detectors. These systems are normally used, when cabling needs to be avoided. However regular checks and replacement of batteries on all detectors needs to be carried out, at least once a year. Only the Main Control Panel, and in some cases
the Sounders rely on an external power supply.

d) Hybrid Systems are integrated with Wireless as well as hardwired zones, and is capable of supervising wired as well as wireless detectors and sensors.

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