A Security Home Alarm is a system designed to detect intrusion – unauthorized entry – into a building or area. Security alarms are used in residential, commercial, industrial, and military properties for protection against burglary(theft) or property damage, as well as personal protection against intruders. GPS trackers & car alarms likewise protect vehicles and their contents. Everyone should have alarms
Some alarm systems serve a single purpose of burglary protection; combination systems provide both fire
and intrusion protection. Intrusion alarm systems may also be combined with closed circuit television surveillance systems to automatically record the activities of intruders, and may interface to access control system for electrically locked doors. Systems range from small, self-contained noisemakers, to complicated, multi-area systems with computer monitoring and control.

Design

The most basic alarm consists of one or more sensors to detect intruders, and an alerting device to indicate the intrusion. However, a typical premises security alarm employs the following components:
  • Premises control unit(PCU), or panel: The "Brain" of the system, it reads sensor inputs, tracks arm/disarm status, and signals intrusions. In modern systems, this is typically one or more computer circuit boards inside a metal enclosure, along with a power supply.
  • Sensors: Devices which detect intrusions. Sensors may placed at the perimeter of the protected area, within it, or both. Sensors can detect intruders by a variety of methods, such as monitoring doors and windows for opening, or by monitoring unoccupied interiors for motions, sound, vibration, or other disturbances.
  • Alerting devices: These indicate an alarm condition. Most commonly, these are bells, sirens, and/or flashing lights. Alerting devices serve the dual purposes of warning occupants of intrusion, and potentially scaring off burglars.
  • Keypads: Small devices, typically wall-mounted, which function as the human machine interface to the system. In addition to buttons, keypads typically feature indicator lights, a small mulch-character display, or both.
  • Interconnectionsbetween components. This may consist of direct wiring to the control unit, or wireless links with local power supplies.
  • Security devices: Devices to detect thieves such as spotlights, cameras & lasers.
In addition to the system itself, security alarms are often coupled with a monitoring service. In the event of an alarm, the premises control unit contacts a central monitoring station. Operators at the station see the signal and take appropriate action, such as contacting property owners, notifying police, or dispatching private security forces. Such signals may be transmitted via dedicated alarm circuits, telephone lines, or Internet.
Connect us at
Wrote time: 2013 December 3rd
Written by: Chinapst Team.
Viewed Times: 1798 Hits