Autronica BS-100 User Manual

Technical Documentation: Fire Detectors used in hazardous areas
P-DET/EX/RCE/PM5/GKa/110995 4 Autronica Fire and Security AS
1 General part
1.1 Danger of explosion.
An explosion is a very rapid combustion, depending on the access of oxygen.
More oxygen accelerate the combustion. Some compounds, such as powder
and dynamite, has oxygen "baked" into the substance.
This description is concerning hazardous gases, and different ways of prevent-
ing these from exploding.
The emphasis is to prevent electrical energy from getting access to the hazard-
ous area in an amount big enough to trigger a fire and consequently an
explosion.
Three ingredients are necessary to perform an explosion. These three ingredi-
ents are:
Explosive gas, oxygen (air) and igniting energy.
If one of these ingredients is missing, completely or partly, an explosion can
not take place.
The curve below shows how these ingredients affect the hazard of explosion.
Specially observe that for gas/air mixtures a value exist where minimum
igniting energy is necessary for an explosion to take place. Both more and less
concentrate mixtures will need more igniting energy to get the gas exploding.
To strong, and too weak concentrations are not exploding.
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Igniting
energy
Igniting energy
necessary for
explosion.
To weak
mixture
Too strong
mixture
Minimum
igniting energy
0 ...............................................% gas.............................................. 100
100 ..............................................% Air..................................................0
General part
Danger of
explosion

Autronica BS-100 Specifications

General

Brand	Autronica
Model	BS-100
Category	Security Sensors
Language	English