Security Alarm system

Security alarm system is widely used in most appliances and in many places. Although security alarm is a great ease for us but to understand working of whole security alarm is actually very difficult. To understand the processing of security alarm consider the concept of three main categories under which almost all security alarm components fall: controls, sensors, and output devices.
Controls:
Controls contain the components that control the working of security alarm such as control panel and key-pad.
Control Panel is the hub of the security alarm system. All security alarms sensors are connected to the control panel. It receives signals from sensors and interprets the signals and orders the output devices to take appropriate actions. The output devices in turn sounds the alrm.
Key Pad is another control component which allows user to interact with the security alarm. Through keypad the security alarm can turn on and off. The security alarm is notified by keypad about any additional upgrades by the user.
Sensors:
In security alarm system, a sensor is mainly used for detection purposes. Many types of sensors are used according to the requirement in security alarm system.
Contacts  is a type of sensor which detects  the opening and closing of doors or windows. Contacts  alert the  control panel  when the magnetic bond between the door frame and the door is broken.
Glass Break Detectors  is another sensor that detect sound frequency. Its mainly purpose is the detection of breaking of windows or glass doors. A glass break detector  alerts the alarm system if glass is broken within approximately 35 feet of the detector. Some glass break detectors can have more range.
Motion Detectors  detects  the movements within a pre-set range of a given environment. Motion detectors are one of the most important and widely used security alarm sensors. According to their importance they are further classified into five kinds.
Infrared Motion Detectors : They use infrared or passive infrared (PIR) sensors to alert the security alarm system to the changes in the levels of heat or movement in a location.
Corner Mounted Motion Detectors  :  They are most commonly used motion detector and mostly used in the markets or halls. They are included in many types of security alarm systems. They are mostly placed in the corner of a room to offer a wide range of motion detection.
Ceiling Mounted Motion Detectors  : They are more powerful than corner mounted because they  alert  security alarm to virtually all movements  and   give full-360º coverage. They are used in places where corner mounted detectors would be blocked by doors, shelves, or other stationary objects.
Pet Immune Motion Detectors : They are temperature detectors. They uses PIR(passive infrared) technology and  alerts the alarm system when large changes in temperature are detected, not the smaller changes.
Outdoor Motion Detectors : They cause the alarm system to turn on lights if a person or vehicle is within a certain range of the motion detector.
Output Devices:
Out devices serves the output in security alarm and many types of outputs are used according to the requirement in security alarm system.For example: Sirens, Lights.
Siren is the output device  and it produces  a loud sound when it is call by  the control panel of alarm system. Siren is used in silence places where there is a dangour of  anyone or it is used on other places also. Strobe Lights are also the output device and when alarm system detects  an unwanted activity the strobe lights are called by the control panel and strobe lights repeatedly turn on and off.