When a battery nears the end of its life, its capacity decreases and the length of time it can maintain backup if the power fails or is cut by by a burglar decreases. As a battery ages, its voltage can fluctuate, injecting noise spikes into the system. These batteries have a limited lifespan of 3 to 5 years. One core of the cable travels outwards from the alarm panel to all the sensors, and another core of the cable returns to the panel to complete the circuit, similarly for the tamper circuit.Ī lead acid or NiMh battery is used to keep an alarm alive in the event of power failure due to an interruption of your supply or deliberate cutting of power by an intruder. If several sensors are used per loop, the microswitches can be wired in series. Sensors are typically powered by 12 volts DC. What Is a Tamper on an Alarm System?Ī basic wired alarm system uses 6 core cable for connection to sensors, 1 pair for power, 1 pair for tamper and 1 pair for the microswitches in sensors which open when the sensor is triggered. Usually each wireless sensor will be on a separate logical zone. New sensors are normally "added" to an alarm system after they are physically installed and the panel IDs the device so that it can subsequently read its alarm status. Sensors communicate with the panel over a low power radio link. Wireless sensors are usually powered by non-rechargeable lithium ion 12 volt batteries with a lifespan of several years.
Wired sensors are powered by the alarm panel, typically using a pair of cores in the cable to provide a 12 volt supply.
Microwave Sensors Like PIR sensors, they detect intruders but have certain advantages over them.PIR Sensors These detect the body heat from an intruder as they walk past the sensor.These may also incorporate magnetic contacts. Shock sensors Used for detecting someone attempting to break glass or otherwise using impact force to attempt to gain entry.The switch is kept closed by a nearby magnet.
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They are small modules which contain microswitches which are normally closed. Sensors are electronic/electrical devices and in the context of security alarms, they either detect entry of an intruder into a building via a window or door, or directly detect the intruders presence. A backup battery is often installed in the sounder so that it still works if a burglar cuts the alarm cable (in additional to signals, this cable also provides power for powering the sounder and charging the backup battery Sounders are powered by solar panels or a cable from the alarm panel. Most modern systems use electronic piezoelectric transducers in the sounder.
Older systems used electromechanical bells. SounderĪn external sounder operates when the alarm is triggered. The backup battery maintains power to the alarm panel, sensors and sounder in the event of a power cut or when an intruder cuts mains power to the panel from outside a building. In less expensive systems, nickel metal hydride (NiMh) AA cells may be used. Backup Battery PowerĪn alarm panel is usually provided with backup power by a 12 volt lead acid battery. As a replacement panel in an existing system, the latter type allows pre-existing wired zones to be connected and also additional wireless sensors which have the obvious advantage of not requiring possibly ugly surface wiring. Alarm panels can be wired, wireless or a hybrid.
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