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You are here: Home / Home / Products / Technology & Tips / In general | ATEX – Categories and ATEX-zones

Categories and ATEX-zones

The Zone classification is the basis for choosing the equipment that is allowed in the zone.

ATEX zones

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).

ATEX 95
Equipment Directive

ATEX 137
Workplace Directive


Protection-
level

 

Group

Category

Atmosphere

Zone
(gas)

Zone
(dust)

Presence of explosive atmospheres

Very high

I

M1

Mining

High

I

M2

Mining

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

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