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 Analog Addressable and XPERT Card for more information.

Addressable System

A system in which signals from detectors, 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, signaling an emergency.


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

Analog Addressable

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

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