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Overview
General
Pneumatics
Principles of Directive 94/9/EC
The directive aims to harmonise the legislation of
European Union member states in order to ensure free
circulation of equipment intended for use in explosive
atmospheres (gas and dust). Since 1 July 2003,
this directive has applied to electrical, mechanical,
hydraulic and pneumatic products.
It concerns the assessment of protective devices and
systems (manufacturers) as well as the design (design
of?ce), installation (installers, panel-builders) and
maintenance (maintenance depts) of installations.
b Sparks Heat source
De?nition of an explosive atmosphere
An explosive atmosphere is de?ned as a mixture of ?ammable substances (in the
form of gas, vapour, mist or dust) with air under atmospheric conditions in which,
after ignition, combustion spreads throughout the entire unburned mixture.
Application since 30 June 2003
b Manufacturers must offer products which comply with Directive 94/9/EC and must
have a Quality Control System that has been approved by a noti?ed body.
b Users are responsible for using equipment correctly according to the zones
they have de?ned within their installations based on the potential risks. Existing
installations must be brought into conformity with the ATEX Directive before
30 June 2006. All new products commissioned must comply with Directive 94/9/EC.
In the event of breakdown, installed equipment that cannot be repaired must be
replaced with equipment complying with Directive 94/9/EC.
Classi?cation
b Potentially explosive environments are classi?ed by zone in compliance with
Directive 1999/92/EC. This directive is aimed at users.
It details the minimum requirements for increasing protection of the health and safety
of workers exposed to explosive atmospheres.
b ATEX Directive 94/9/EC de?nes categories of equipment and protection systems
which can be used in the corresponding zones.
v Categories M1 and M2 relate to mines (group I)
v Categories 1, 2 and 3 relate to other locations (group -II) often referred to as
"Surface industries".
Documents and recommendations/products
b ATEX-certi?ed products must be supplied with an EC declaration of conformity and
a user manual.
b At the time of sale, the sales representatives must check the zone in which the
b Oxidiser
Oxygen (air contains
21% oxygen)
b Fuel
Flammable substances in the
form of gas, vapour, mist, dust
product is to be used. On the order, the customer must inform the manufacturer of
the conditions of use.
b Manufacturers and distributors must ensure that their sales of ATEX products are
traceable (so that customers who have been sold an ATEX product can be located
in relation to the product's date of manufacture).
b In the case of an assembly, the product with the lowest certi?cation level
determines the level of the whole assembly.
Some relevant areas
Water treatment, chemical factories, silos, gas storage, ports, re?neries, paper industry,
paint factories, vehicles (if used in ATEX conditions), etc.
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