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A security alarm is a system designed to detect intrusion – unauthorized entry – into a building or area. Security alarms are used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders. Car alarms likewise protect vehicles and their contents. Prisonsalso use security systems for control of inmates.
Some alarm systems serve a single purpose of burglary protection; combination systems provide both fire and intrusion protection. Intrusion alarm systems may also be combined with closed-circuit television surveillance systems to automatically record the activities of intruders, and may interface to access control systems for electrically locked doors. Systems range from small, self-contained noisemakers, to complicated, multi-area systems with computer monitoring and control.
The most basic alarm consists of one or more sensors to detect intruders, and an alerting device to indicate the intrusion. However, a typical premises security alarm employs the following components:
- Premises control unit (PCU), Alarm Control Panel (ACP), or simply panel: The “brain” of the system, it reads sensor inputs, tracks arm/disarm status, and signals intrusions. In modern systems, this is typically one or more computer circuit boards inside a metal enclosure, along with a power supply.
- Sensors: Devices which detect intrusions. Sensors may be placed at the perimeter of the protected area, within it, or both. Sensors can detect intruders by a variety of methods, such as monitoring doors and windows for opening, or by monitoring unoccupied interiors for motions, sound, vibration, or other disturbances.
- Alerting devices: These indicate an alarm condition. Most commonly, these are bells, sirens, and/or flashing lights. Alerting devices serve the dual purposes of warning occupants of intrusion, and potentially scaring off burglars. These devices may also be used to warn occupants of a fire or smoke condition.
- Keypads: Small devices, typically wall-mounted, which function as the human-machine interface to the system. In addition to buttons, keypads typically feature indicator lights, a small multi-character display, or both.
- Interconnections between components. This may consist of direct wiring to the control unit, or wireless links with local power supplies.
- Security devices: Devices to detect thieves such as spotlights, cameras & lasers.
In addition to the system itself, security alarms are often coupled with a monitoring service. In the event of an alarm, the premises control unit contacts a central monitoring station. Operators at the station see the signal and take appropriate action, such as contacting property owners, notifying police, or dispatching private security forces. Such signals may be transmitted via dedicated alarm circuits, telephone lines, or Internet.
Corry is a city in northwestern Pennsylvania in the United States. With a population of 6,605 at the 2010 United States Census, it is the second largest city in Erie County. Corry is a part of the Erie, PA Metropolitan Statistical Area. The city became famous in the late-19th and early-20th centuries for being the manufacturer of Climax locomotives.
Erie County was formed from parts of Allegheny County on March 12, 1800. On May 27, 1861, tracks owned by the Atlantic and Great Western Railroad intersected with those of the Sunbury and Erie Railroad and was called the “Atlantic and Erie Junction”. Land at the junction was owned by Hiram Cory, who sold a portion to the Atlantic and Great Western in October 1861. The railroad built a ticket office at the junction and named it for Cory, but through a misspelling it became Corry.
The combination of railroad growth and the discovery of oil in nearby Titusville contributed greatly to Corry’s development. This boomtown was chartered as a borough in 1863 and designated as a city in 1866. Industry has played a big part in Corry’s growth, and the Corry Area Historical Society maintains a museum where one of the Climax locomotives (the steam engine used in logging operations that brought fame to Corry) is on display.