By Element Security

09/14/2010 Motion detectors are a very important part of a home or business alarm security system. Among motion detectors there are several different types available and one of the most common are the Passive Infrared Motion Detectors.

Passive Infrared Motion Detectors or PIR detectors use "passive infrared" technology. The device is mounted on a wall or somewhere in the corner of a room. continues to It sends invisible beams out into the covered area in the form of layers. The top most layer goes the furthest and averages almost 60 feet straight ahead and 35 feet on the sides.

The center layer of beams spreads the area around mid way and the bottom layer sweeps the room nearest to the detector. These beams independanty measure the infrared temperature of anythind on which they land on and continuously look for a clash of temperature against that point.
For example if a beam lands on your table and knows what temperature it is, when anything else or a person comes in front of the couch its temperature is different and causes a violation so the alarm is triggered. These motion detectors are very hard to compromise.

Passive motion detectors have a microchip in them that will adjust the device for slow and methodical temperature changes. This way as your room warms up and cools down during an armed alarm period, you will not get a false alarm.
Some motion detectors are designed to be mounted in the ceiling and spread a 360-degree cone downward. Some are recessed to replicate an electric outlet and various other combinations are available for the James Bond like clients. Most often the device is an aesthetically pleasing small device that is mounted 5-7 feet high in the corner of a room.

But obviously these motion detectors cannot protect every inch of your home or business unless you use many of them to cover all the area. So you should place them carefully and intelligently to secure the sensitive area.

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