ATEX

The Directive covers a surprisingly large range of equipment, potentially including equipment used on fixed offshore platforms, in petrochemical plants, mines, flour mills and other areas where a potentially explosive atmosphere may be present. Areas, classified into zones (see below for specification) are devided into zones 0,1 and 2 for gas/mist and 20, 21 and 22 for dust. To equipment must have (in very broad guidelines): effective source of ignition, be intended for use in a potentially explosive atmosphere (air mixtures); and  be under normal atmospheric conditions.

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ATEX Zone definitions:

Zone 0 — An atmosphere where a mixture of air and flammable substances in the form of gas, vapor or mist is present frequently, continuously or for long periods.

Zone 1 — An atmosphere where a mixture of air and flammable substances in the form of gas, vapor or mist is likely to occur in normal operation occasionally.

Zone 2 — An atmosphere where a mixture of air and flammable substances in the form of gas, vapor or mist is not likely to occur in normal operation but, if it does occur, will persist for only a short period.

Temperature Classes:

T1: 450 Celsius max. permissible temperature at the surface
T2: 300 Celsius
T3: 200 Celsius
T4: 135 Celsius

T5: 100 Celsius
T6: 85 Celsius

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