ATEX Applications
An ATEX zone is a classification system used to define areas where there is a risk of explosive atmospheres due to the presence of flammable gases, vapors, mists, or combustible dusts. It is part of safety regulations, particularly in Europe, to ensure appropriate equipment and procedures are used to prevent explosions in hazardous environments.
ATEX Zone |
Type of Atmosphere |
Likelihood of Explosive Atmosphere |
Example Areas |
Zone 0 |
Gases/Vapors |
Continuously present or present for long periods |
Inside tanks, reactors, or process vessels |
Zone 1 |
Gases/Vapors |
Likely to occur during normal operation |
Near filling points, valves, or pipelines |
Zone 2 |
Gases/Vapors |
Unlikely in normal operation, and if it occurs, brief |
Areas around Zone 1, ventilation outlets |
Zone 20 |
Dust |
Continuously present or present for long periods |
Inside silos, mills, or hoppers |
Zone 21 |
Dust |
Likely to occur during normal operation |
Dust-handling systems, near conveyor systems |
Zone 22 |
Dust |
Unlikely in normal operation, and if it occurs, brief |
Surroundings of Zone 21, storage areas |