EXPLOSION PROOF

trio-bas-schema-ATEX

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