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Ex Signaling devices<br />
ATEX guarantees your safety<br />
Zones and categories<br />
Potentially explosive areas are defi ned in section 2<br />
of ElexV (Germany) as areas in which the atmosphere<br />
may be capable of explosion due to local and operational<br />
conditions.<br />
It has proven to be useful to divide potentially explosive<br />
areas into zones, taking into account different hazards<br />
caused by explosive atmospheres.<br />
Definition of the zones according to section 2 para. 4 ELX (96)<br />
Potentially explosive areas due to combustible gases<br />
Zone 0 Zone 1 Zone 2<br />
Areas in which an explosive atmosphere of<br />
gases, vapours or mists exists constantly,<br />
over long periods or frequently.<br />
Areas in which an explosive atmosphere<br />
of gases, vapours or mists occasionally<br />
occurs.<br />
Areas in which explosive atmospheres of<br />
gases, vapours and mists normally never<br />
occur, but if they do, then only rarely and<br />
only for short time periods.<br />
Potentially explosive areas due to combustible dusts<br />
Zone 20 Zone 21 Zone 22<br />
Areas in which an explosive dust<br />
atmosphere exists constantly, over<br />
long periods or frequently.<br />
Areas in which an explosive dust<br />
atmosphere occasionally occurs.<br />
Areas in which explosive dust atmospheres<br />
normally never occur, but if they do, then<br />
only rarely and only for short time periods.<br />
The Ex devices are sub-divided analogue to the Ex zones into the following device categories<br />
Device classification according to groups and categories:<br />
Group I<br />
Group II<br />
Category M Category 1 Category 2 Category 3<br />
G D G D G D<br />
1 2<br />
(gas)<br />
Zone 0<br />
(dust)<br />
Zone 20<br />
(gas)<br />
Zone 1<br />
(dust)<br />
Zone 21<br />
(gas)<br />
Zone 2<br />
(dust)<br />
Zone 22<br />
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