Burglar alarms have become standard equipment in stores and other businesses, and they’re becoming increasingly common in private homes as well. special alarms are dual systems that detect both fire and intrusion. When combined with CCTV systems, intrusion alarms automatically record the activities of intruders and may even interface with access control systems for electrically locked doors. Intruder Alarm System is also called Burglar Alarm is a very important tool in Security Systems. In case of intrusion or burglary, the siren will make a very loud sound which can scare the intruder, at the same time the control panel can dial the police control room to send the alarm signal with the site information so that the police can reach the site to take appropriate action. Intruder Alarm System is designed using Control Panel, Sensors, Siren or Sounder and autodialer. The Control Panel is the heart of the system which receives signals from all the sensors. Different types of sensors are used for different locations. for doors and windows door contacts or magnetic contacts are used. When the door is opened or closed the signal is sent to the control panel.
For glass doors and windows glass break detectors are used. This sensor sends the signal to the control panel when the glass is broken. If there is movement in the protected site Motion Detectors are used. There are two types of motion detectors available. Passive Infra-Red (PIR) or dual tech where the sensing is through both IR and Microwave rays. In case of panic situation panic buttons or kick, bars can be used to send a panic alarm to the monitoring station. For safe boxes or safe rooms, vibration sensors can be installed which detects any vibration caused by explosives or tamper. The site to be protected can be installed with these sensors along with a control panel and a siren. Sirens make very loud sound with strobe light which flashes at the time of alarm.Bells-only alarms
make a noise, but don’t contact anyone (such as the police or you).Dialler burglar alarms
automatically dial your phone number, or that of nominated friends and family, when the alarm is triggered.Smart home-security systems
contact you or family members when the alarm goes off through a smartphone or tablet app.A monitoring contract
means you pay a company monthly or annually to take action or call the police if the alarm goes off.
Wireless burglar alarms
Wireless alarms use battery-powered sensors that communicate with a control panel using radio signals. These alarms tend to look nicer and are generally easier to install.
Bells-only burglar alarm
The bells-only alarm makes a loud noise, which will hopefully alert someone in the area to the situation and/or scare off an intruder. 57% of the people we spoke to own one of these types of alarms.
Elements of alarm systems
Alarm control unit/panel (switchboard).
The main unit is mounted in a dedicated housing/box together with a backup/buffer battery guarantying operation of the system during power outages. The housing is equipped with an anti-tamper switch connected to the dedicated input of the panel. If the system is not put in the service mode, any attempt to open the case ends up triggering an alarm. Control panel monitors the proper operation of all the equipment installed in the system. It collects information from the sensors, keypads, anti-tamper circuits, detects any faults in the wiring, and in the event of an irregularity, switches on optical and acoustic signaling. If the control panel is equipped with a communication module, Control panel monitors can notify the user or a security company about the alarm action. Any interference into the system will not go unnoticed, being stored the memory of the unit.
Keypads, touch panels
Keypads manipulators allow the installer to set up the control panel and program all the functions of the alarm system. They also are the user interface for communication with the alarm system, which provides information on the system status and enables arming and disarming operations. An alarm system usually contains one main (master) keypad and (if needed) zone/partition manipulators. The master device has LCD display and numeric keys, or touch screen. The partition keypads have numeric keypads and simple optical signaling in the form of LEDs. They are used to arm and disarm the partitions, while the main keypad is responsible for the complete control of the entire alarm
Sensors/detectors are the most essential elements of any alarm system. The proper selection, deployment, and operation of sensors determine the actual usability of the entire system. The popularly employed sensors are PIR and PIR+MW motion detectors and reed switch sensors mounted on the door/window frames. These and other sensors used in alarm systems can be classified as follows.
Magnetic sensors (reed switches) are closed insufficiently strong magnetic field of the magnets (when the magnet is close to the reed contact) and open when the magnet is moved away. Such sensors are basic elements of perimeter protection systems and their primary task is to detect attempts of opening doors and windows.
Wireless controllers enable the expansion of the system with additional wireless devices, e.g. detectors. They are connected to the control panel via the system bus. The programming is done via the control panel, using a keypad or computer running dedicated software. Battery-operated wireless sensors can work approx. 2 years without battery exchange. The battery life depends on the transmission power and on how many times the transmission takes place. Wireless subsystems are ideal for use in each case where any additional wiring is unacceptable.
GSM notification modules.
If the control panel does not have a built-in GSM module, an external GSM notification/control module will allow the transmission of information via GSM to a monitoring station/center or to phone numbers defined in the module. Usually, the versatile modules can be used with control panels from different manufacturers. They communicate with them via dedicated inputs and outputs. Using the CLIP or SMS service, they enable control of some devices via the main unit. Other notification/control modules communicate with the control panels via system bus and are fully integrated with them.
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