Каталог Weidmuller: Electronics - Analogue Signal Conditioning

EX basics
Technical appendix/Glossary
The European ATEX Regulation applies to facilities and
their usage in hazardous areas.
The term "ATEX" derives from the French phrase "Atmospheres
Explosive". The regulation currently includes two directives from
the European Union concerning explosion protection. These
are the ATEX operational directive 1999/92/EG (ATEX 137) and
the ATEX product directive 94/9/EG (ATEX 95). The ATEX 137
operational directive specifies the minimum requirements for
improving the protection of health and security of workers in
environments at risk of explosions. The ATEX 95 product
directive specifies the rules for introducing products on the
market that will be used in zones where this is risk of explosion.
This directive is the first to include non-electric devices within
its jurisdiction.
The purpose of the directive is to protect personnel who work
in the hazardous areas. Appendix II of the directive contains the
basic health and safety requirements. These must be followed
by the manufacturer and compliance must be proven by
declarations of conformity. Since June 30, 2003, all devices,
components and protective systems brought to the market
must be in compliance with the ATEX 95 product directive.
The ATEX 95 directive classifies devices and components for the Ex zone into two main groups:
Group I
Group II
=> Devices for use in mining, for underground and => Devices for use in the other hazardous areas
above-ground operations
• Coal dust
• Methane
• Harsh operating conditions
Category
M 1 M 2
Gases, Vapours and Mists
G
Dusts
D
Categories
1 2 3
No additional divisions
Zones
0 1 2
Zones
20 21 22
For applications in the oil, gas and chemical industries, it is
particularly important to follow the Group-II "G" requirements
concerning electrical or electronic devices and components.
W
W.11