30
16. Glossary
Detector:
A unit that detects gas concentration and converts it to electric
signals.
Diffusion type:
A method to detect gas by utilizing convection and diffusion of
gas.
Explosion proof construction:
A totally enclosed structure. When an explosive gas
explodes in a container, the container can resist the pressure
and prevent the ignition of explosive gases outside of it.
Gas to be detected:
Gas that is detected and indicated which sets off an alarm.
Detection range:
Range of gas’s concentration that can be indicated and set off
an alarm.
Operating temperature and humidity ranges: The ranges of temperature and humidity within
which performance and functionality can be maintained during
usage of the Detector.
Maintenance and inspections:
Work to guarantee that the equipment perform its
required functions.
Calibration gas:
Gas used to calibrate scales of the equipment.
Hazardous area:
An area in a plant or facility with a hazardous atmosphere
where explosive gases may mix with air and explode or start a
fire. An area where gas may be present.
Non hazardous area:
An area where electric equipment that has no potential to create
a hazardous atmosphere.
Hazardous atmosphere:
Atmosphere within the explosive limit where explosive gas and
air are mixed.
(Quoted from gas detection terms and detector tube gas meter terms used by the Industrial
Gas Detector Alarm Association.)
