Classification of susceptible hazardous areas containing flammable gases and fumes:
In the case of dust, and in accordance with IEC 61241-3, as well as gases, three hazardous areas, ZONE 20 ZONE 21, ZONE 22, are defined as Zones 0, 1 and 2, respectively, in the classification of gases.
Zone 20: An area where there are normal operating conditions, explosive dust, cloudy or multiple masses, and concentrations and concentrations in such a way as to expose the explosion and combustion air during combustion.
These dust clouds may form as cloudy masses of uncontrollable and thick layers that have been accumulated on the equipment and they still have the same explosive properties.
These layers or cloud-like masses can form inside operational spaces and may endanger the environment. This area, such as zone 0, is flammable in gas or vaporous environments.
Zone 21: An area in which normal operating conditions may result in a cloudy cloud of dust explosive enough to combine with air and create an explosive dust blend. This area, such as zone1, in environments susceptible to gas or vapors Flammable.
Zone 22: An area that, under normal operating conditions, rarely clouds of explosive dust may develop and continue for a short time, or in the case of abnormal operating conditions, explosive atmospheres of dusty layers of dust can be generated, which if combined With air, it becomes a potentially explosive dust. This can circulate around devices that blow away dust from the dust in the vast space of space, such as Zone 2 in explosive atmospheres.