Fire & Gas Detection Terminology

Fire & Gas Detection Terminology includes the different gas detectors like combustible, toxic, flame, heat, smoke, manual call point, lower explosive limit etc.

Fire & Gas Detection Terminology

Combustible Gas Detector:

A detector that senses the presence of combustible gas.

Toxic Gas Detector:

A detector sensitive to toxic gas.

Flame Detector:

A detector which responds to radiation emitted by a flames from a fire.

Heat Detector:

A detector which responds to increase in temperature.

Smoke Detector:

A detector which detects visible or invisible particles of combustion.

Manual Call Point:

A device for the manual initiation of alarm.

Lower Explosive limit:

The concentration of combustible gas, vapour or mist in air below which an explosive gas atmosphere will not be formed.

Addressable Devices:

A fire alarm system component with discrete identifications that can have its status individually identified or that is used to control other functions.

Time of Response Tx (Gas Detectors):

The time interval, with the apparatus in warmed-up condition between the time when an instantaneous variation in volume ratio (V/V) is prodcued at the appratus inlet and the time when the response reaches a stated percentage (x) of the final indication.

Volume Ratio (V/V):

Volume ratio can be define as ratio of the volume of a component to the volume of the gas mixture under spcified conditions of temperature and pressure.