Key Alarm Components

Now let us have a look at the key components that help in complete the entire burglar systems and make it ready for use. 

• Magnetic switch – these are perhaps the most common devices that are used to activate a burglar alarm system. They have two important parts, i.e. the contact switch and an activated magnet. The latter is usually mounted on the door. When the door is closed the magnet remains in a non-active mode. But the moment somebody tries to open it, they get into an active mode. They are tried and tested method of securing homes and other premises from burglars and other unwanted intruders. 
  
  
• Passive Infrared Sensors (PIR) – PIRs work because of a very sophisticated infrared technology in play. They work because of changes in energy or infrared levels that could be caused by any intruders or unwanted visitors. They are referred to as PIRs because they do not transmit any form of energy. However, when a person moves around and the body temperature is picked up the PIR device, it helps to send a signal back to the main device. This in turn results in the Passive Infrared Sensors getting activated which sets off the alarm system.
  
  
• Ultrasonic detectors – These detectors are again very sophisticated as far as use of technology is concerned. They have a number of applications and very commonly used in modern day burglar systems. They work on radio waves and sound waves to activate alarm systems. They are also referred to as transreceivers because they perform the job of sending and receiving sound signals. They come in various frequencies ranging from 23 to 40 kHZ. The sound waves work depending on the movement that occurs in the protected area. Should there be a change in the movement in the protected area, there will be a change in the sound frequency. This activates the alarm system and prevents any damage being done to the protected area.
  
  
• Photo electric beams are also considered very effective in protecting a specific area from unwanted intruders. They work by transmitting infrared or visible beams across a specific area, whenever is an intruder or unusual activity. The beams are increased in strength by increasing the number of beams to two or even more. While it is quite useful, if the intruder is aware of the technology being used, it might not work and he can bypass this device. It is useful only for short distance monitoring and may prove to be not very useful when long range monitoring of movements are to be monitored.