What are the ATEX/IECEx Instrument Markings ?

USA and Canada

In the USA and Canada, Class indicates the "fuel" present in the environment

    Class 1: Flammable gases vapors and mists
    Class 2: Combustible dusts
    Class 3: Easily ignitable fibers

Div indicates the risk of an explosive atmosphere

    Div 1: Explosive atmosphere present or occasionally present
    Div 2: Explosive atmosphere occurs rarely

Class 1, Div 1 environments require intrinsically safe devices.

ATEX/IECEx (Europe and Worldwide)

In Europe and throughout the rest of the world, Group and Zone designations are used:

    Group I: Mine
    Group II: Gas
    Group III: Dust

Zone indicates the likelihood of an explosive atmosphere:

    Zone 0: Explosive atmosphere present
    Zone 1: Explosive atmosphere likely to occur
    Zone 2: Explosive atmosphere likely to not occur





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