How should explosive atmosphere zones be divided?
The ATEX directive distinguishes between two types of explosive atmospheres: gas and dust.
Areas within these two kinds of explosive atmospheres are each divided into three sub-zones.
Although the zones characteristics are identical for both gas and dust, their numbering is different. Zone 0, 1 and 2 refer to gas and Zone 20, 21 and 22 refer to dust.
Zone 0 / 20: Constant danger
> Permanent presence of explosive gasses or combustive dust.
Zone 1 / 21: Potential danger
> Occasional presence of explosive gasses or combustible dust during normal duty.
Zone 2 / 22: Minor danger
> Presence of explosive gasses or combustible dust is not likely to occur or only for a shorter period of time