If you are in the market for burglar alarm systems, whether for home or business, you will soon find that there are many types available. They can range from simple ones you install yourself to more sophisticated ones that need to be professionally installed. It is a simple question of how they are triggered and then how they alert you.

The simplest type of alarm is one that incorporates a circuit system that is broken. These come in two different varieties, either closed-circuit or open circuit. In a closed-circuit type, the circuit functions when the door or window is shut. When it is opened, the circuit is broken and the alarm is triggered.

In open circuit systems, the circuit does not become completed until the point of entry is opened. When the door or window is open, the circuit is then closed and the alarm will be triggered. Closed-circuit designs are generally preferred as they are harder to be deactivated by an intruder.

Most circuit systems will also include a control box that monitors the circuits and controls the alarm mechanism. In order to turn the alarm off, you need to enter a code on a keypad.

These types of systems work well for detecting entry. But once the entry has happened, you need an alternative method for detection. A common device used at this point is a motion detector.

Radar is used in some motion detectors. These emit energy that will bounce back to the sensor unchanged if no one is there to disturb it. If a body does interrupt the energy, it will bounce back changed and trigger the alarm.

Another type of motion detector that can be used is a photo sensor. In this case, it is a beam of light rather than radio energy. The beam is aimed toward a sensor, across a doorway for example. When the beam is broken, the change is sensed and the alarm is triggered.

More sophisticated security alarms also have passive infrared motion detectors. These sense the body heat of an intruder. They are set to go off only when the infrared energy changes rapidly to avoid false alarms.

The more effective security systems combine more than one type of detection device, depending on the area it is being used for. When the alarm is triggered, bells, sirens, horns or some combination will go off in the building. At the same time, a call can be sent to the security company or police in more sophisticated systems.

If you have been thinking about investing in burglar alarm systems, you will find one that meets your budget. And you will sleep easier tonight knowing you are protected.

Jason Williams is an expert in burglar alarms. If you want more information about burglar alarm systems or are searching for a reputable security company please visit http://www.adt.co.uk

Tags: Home Security