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What is ATEX? What is ATEX ATEX

The name ATEX comes from the French...
ATmosphere EXplosibles
and refers to potentially explosive atmospheres.


The ATEX regulation is a European directive which requires all heads of organizations to fully understand the risks related to certain explosive environments. To do this, an evaluation of the risk of explosion in a company is required in order to identify any locations where explosive environments could form, and then to put in place the means to avoid explosion.



ATmosphere EXplosibles


How do you choose equipment that is adapted for an environment at risk of explosion...

ATEX environments are subdivided into three zones:
• zones 0, 1 or 2 for gases
• zones 20, 21 or 22 for dust
There are two groups of materials:
• group I: concerns mines (more restrictive)
• group II: concerns all above-ground industries
For Group II (above-ground industries), a specifically adapted category of equipment is associated with each ATEX zone classification.



Zone classification ATEX classification required for equipment
(for Group II, above-ground industry)
Zone 0 (gas)
Zone 20 (dust)
PERMANENT RISK
Category 1
VERY HIGH LEVEL OF PROTECTION
The explosive mix is present constantly or for a long period of time
Zone 1 (gas)
Zone 21 (dust)
FREQUENT RISK
Category 2
HIGH LEVEL OF PROTECTION
An explosive mix may form under normal working conditions.
Zone 2 (gas)
Zone 22 (dust)
OCCASIONAL RISK
Category 3
NORMAL LEVEL OF PROTECTION
An explosive mix has a small chance of forming and would exist only for a short period.

What does the marking mean...

All products designed for use in explosive zones have a specific marking on them. This marking contains all the information necessary to determine the zones in which the product may be used.


Example of marking: CE 0081 Ex II 2 GD Ex nAnL IIB T4


I = mines,
II = above-ground industry

1 = permanent risk (zones 0/20),
2 = frequent risk (zones 1/21),
3 = occasional risk (zones 2/22)