There are several different types of burglar alarms available and deciding which one to choose from depends on how aggressive crime is in an area, cost, ease of installation and particular type of crime. Burglar alarms can create piece of mind with the home owner and pay for themselves in the instance that a crime is averted or criminals are caught.

Facts

Security is essential to any home or business. One way to feel safer and protect valuables or loved ones is to install a burglar alarm system. Burglar alarm systems come in many types. They can be hard-wired, in which systems are installed into a building and communicate either through wires or wireless, which use radio waves. There are also self-contained versions, which is an alarm disguised as a device such as a DVD player, that activates an alarm system once it is disturbed.

Types

There are two basic types of burglar alarms: a closed-circuit system and an open-circuit system. In a closed-circuit system, the electrical circuit is complete until a door or window is opened when the alarm is engaged. When the circuit is broken, then an alarm sounds. Conversely, in an open-circuit the path of electricity is open and by opening a door or window the circuit closes and this connection sounds an alarm.

Features

Many burglar alarms systems go beyond the simple open and closed circuit designs. This is because open and closed circuit designs are only effective in guarding the perimeter of a building. However, once the intruder is inside and has gotten past the open or closed circuit alarm, those alarms no longer can send an alert or sound an alarm. In this case, a motion detector used on the inside of a facility is particularly useful. A motion detector uses either microwave radio energy or ultrasonic waves to send out waves and determine whether it is getting the same types of patterns back in return. If it receives a different pattern then it sounds an alarm or alerts a security center.

Benefits

The benefits of having a tandem burglar alarm of either an open or closed circuit perimeter alarm, combined with a motion sensor alarm on the inside, is that this combination of devices makes sure that the building is free of intruders both inside and out. While motion sensing lights are useful on the outside of a building they are not as useful as perimeter alarms because they can easily be tripped by a bird or a branch outside.

Function

When creating a burglar alarm system to protect a home or business, there are three ways that an alarm protects the premises: sounding an alarm, turning on a spotlight or several inside lights, or activating a telephone auto-dialer that either calls the police or an alarm system company. The alarm and lights function are to startle and deter an intruder while alerting the residents of a building or neighbors. The auto-dialer is a follow-up device that sends the police to a residence as quickly as possible and is especially important if the residents are under duress.

Article Source:   www.eHow.com

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