Alarm System

                                          Alarm

An alarm device or system of alarm devices gives an audible, visual or other form of alarm signal about a problem or condition. Alarm devices are often outfitted with a siren. Alarm is giving any information therefore it is one kinds of information and communication technology (ICT).

Alarm devices include:

Burglar alarms, designed to warn of burglaries; this is often a silent alarm: the police or guards are warned without indication to the burglar, which increases the chances of catching him or her. Alarm clocks can beep, buzz or ring off as an alarm at a set time to wake a person up or for other reminders Distributed control systems (DCS), found in nuclear power plants, refineries and chemical facilities also generate alarms to direct the operator's attention to an important event that he or she needs to address. Alarms in an operation and maintenance (O&M) monitoring system, which informs the bad working state of (a particular part of) the system under monitoring.

   

 First-out alarm
Safety alarms, which go off if a dangerous condition occurs. Common public safety alarms include:
Civil defense siren also known as tornado sirens or air raid sirens Fire alarm systems

It is used this alarm any burning place. This fire alarm phone is shortcut.  Therefore very important this alarms our life. Fire alarm we used for very emergency.
"Multiple-alarm fire", a locally-specific measure of the severity of a fire and the fire-department reaction required. Smoke detector this alarm.

Car alarms

Car alarms are siren for side of people. Car alarm used in private car and government car. But every car alarm used in government car. That is called is ambulance.

Auto dailer alarm, also known as community alarm

   

Personal alarm

Personal alarm is used for only one person. This alarm is used in any important work any time. Personal alarm in mobile phones, room alarm and watch etc. Tocsins – a historical method of raising an alarm. This alarm is near related in ICT. Alarms have the capability of causing a fight-or-flight response in humans; a person under this mindset will panic and either flees the perceived danger or attempt to eliminate it, often ignoring rational thought in either case. We can characterize a person in such a state as "alarmed".

                             

With any kind of alarm, the need exists to balance between on the one hand the danger of false alarms (called "false positives")  the signal going off in the absence of a problem and on the other hand failing to signal an actual problem (called a "false negative"). False alarms can waste resources expensively and can even be dangerous. For example, false alarms of a fire can waste firefighter manpower, making them unavailable for a real fire, and risk injury to firefighters and others as the fire engines race to the alleged fire's location. In addition, false alarms may acclimatize people to ignore alarm signals, and thus possibly to ignore an actual emergency: Aesop's fable of The Boy Who Cried Wolf exemplifies this problem.