Conventional detectors are simply on/off devices - if there is no smoke or heat they do nothing. If there is a certain, pre-set level of smoke or heat, they switch into the 'Alarm' state. Devices are connected to one circuit, known as a zone, and each circuit is connected to a control panel. If a conventional detector goes into alarm, the control panel will be able to identify which zone has gone into alarm, but will not have the exact location of the fire or which device went into alarm.

For more information of conventional fire systems, visit the Questions pages.