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ATEX torch marking – Device group, Category(Zone) & Atmosphere

August 7, 2012

Torches marked with  are explosion-proof to some extent according to Directive 94/9/EC (ATEX 95).

 Following the EX logo, there’re different designations identifying differently.

 I or II – Device group

I means Mining, very high degree of safety

II means All other explosive areas, high degree of safety

 1, 2 or 3 – Category(also M1 or M2, will not be specified here)

1 means the torch can be used in Zone 0 where flammable gases, vapors or liquids are present continuously or for long periods of time.

2 means the torch can be used in Zone 1 where flammable gases, vapors or liquids are likely to exist.

3 means the torch can be used in Zone 2 where flammable gases, vapors or liquids are not likely to exist or exist for a short time.

 A picture to illustrate different Zones:

G or D – Atmosphere

G means Gas

D means Dust

 More designations will be mentioned later for your reference.

 * Reference: http://www.ecom-ex.com/en/intrinsic-safety/european-directive/

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