Categories and ATEX-zones
The Zone classification is the basis for choosing the equipment that is allowed in the zone.
The chart below provides a quick overview of the classification of potential explosive atmospheres (ATEX Workplace Directive) as well as requirements for the equipment (ATEX Equipment Directive).
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ATEX 95 |
ATEX 137 |
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|
Group |
Category |
Atmosphere |
Zone |
Zone |
Presence of explosive atmospheres |
|
Very high |
I |
M1 |
Mining |
|
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|
High |
I |
M2 |
Mining |
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|
Very high |
II |
1 |
Gas (G) |
0 |
|
An explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is present continuously, frequently or for long periods. |
|
II |
1 |
Dust (D) |
|
20 |
An explosive atmosphere in the form of a cloud of combustible dust in air is present continuously, frequently or for long periods. | |
|
High |
II |
2 |
Gas (G) |
1 |
|
An explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally. |
|
II |
2 |
Dust (D) |
|
21 |
An explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally. | |
|
Increased |
II |
3 |
Gas (G) |
2 |
|
An explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period only |
|
II |
3 |
Dust (D) |
|
22 |
An explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only. | |
Read more:
– ATEX pumps
– ATEX pumps from IWAKI Nordic A/S
– Facts about ATEX
– Product marking