Conventional systems are the older type of fire alarm systems.The detector communicates with the fire alarm control panel simply by changing state from high impedance to low impedance when smoke is detected.Smoke detectors are typically wired together up to 32 detectors on each zone and a single fire alarm control panel can usually monitor a number of zones which can be arranged to correspond to different areas of a building.In the event of a fire, the fire alarm control panel is able to identify which zone contains the detector or detectors in alarm, but it�s not able to identify which individual detector or detectors is in an alarm state.

A fire alarm system is number of devices working together to detect and alert people through visual and audio appliances when smoke/fire is present. These alarms may be activated from smoke detectors and heat detectors. Analog addressable Fire Detection devices are individually identified with an address (number) on a loop of wiring. The control panel communicates with each device in turn and each device reports back with an analog value based upon how much smoke or heat is present. The control panel, not the detector, then makes the decision to sound the alarm system. With an intelligent system, if a fire is detected, its position can be pin-pointed because each device has its own unique address which means its exact location can be found quickly.

VESDA by Xtralis very early warning aspirating smoke detection solutions with continuous air sampling provide the earliest possible warning of an impending fire hazard. VESDA aspirating smoke detectors buy the critical time needed to investigate an alarm and initiate an appropriate response to prevent injury, property damage or business disruption. VESDA detectors have multi level warnings and a wide range of sensitivity that does not degrade or change over time, so even minute levels of smoke can be detected before a fire has time to escalate.VESDA early warning detectors are available in a variety of models to accommodate a broad range of environments and applications.From small to very large,open spaces and from the cleanest to the dirtiest environments,VESDA multi level detection provides reliable, high sensitivity,very early warning smoke detection.