For further clarification of terms or to suggest future additions, please email the Product Support department.



Addressable devices are given an individual address so their exact location can be identified. See Analogue Addressable and XPERT Card for more information.

Addressable System

A system in which signals from detectors, manual call points or any other devices are individually identified at the control and indicating equipment.

Air Sampling Unit

A device used to detect smoke within ventilation systems.


The state which a device enters when a fire is detected, signalling an emergency.


An analogue signal is one which goes up and down steplessly. Analogue fire detectors are not restricted to two states - alarm/no alarm - as conventional detectors are.

Analogue Addressable

The term used to describe a fire detection system incorporating analogue detectors which are also identified by a number or 'address'.

Analogue addressable detectors provide location-specific information on the ambient level of smoke, heat or other product of combustion (eg carbon monoxide).

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This is an approval for products designed for use in hazardous areas. See also BASEEFA.