The simplest and most popular of the three approved methods of alarm confirmation, two or more detectors need to be activated to generate a confirmed alarm.

Alarms & Electrical (Devizes) Ltd have been installing control panels where sequential confirmation is a programming option for a number of years.

The first detector activated causes the transmission of an "unconfirmed alarm" signal to the central monitoring station. Should a second detection device activate within a specified time period the remote signaling equipment transmits a "confirmed alarm" signal to the central monitoring station.

Confirmation from two devices in the same area/room must be from detectors of different technologies, for example a movement sensor in association with perimeter detection such as an inertia sensor, door/window contacts or break glass detectors.

Movement detector in two separate areas can be used to signal a confirmed alarm but care must be taken to assess the risk of a possible loss from entry into a single room.