“ATEX” is the acronym of “ATmosphere EXplosive”.
An explosive atmosphere is a mixture of flammable substances in the form of gases, vapors, mists or fuels in a powder state with air or comburent, in certain atmospheric conditions in which, with ignition, combustion propagates to the flammable mixture.
In order for a potentially explosive atmosphere to form, the flammable and / or combustible substance must be present in a certain concentration; if the concentration is too low (poor mixture) or too high (rich mixture) there is a low tendency to the formation of an explosion but a combustion reaction can be produced, if not no reaction at all.
The explosion can therefore occur only in the presence of a source of ignition and when the concentration is within the explosivity range in mass or volume of substances, between the minimum limit (LEL) and maximum (UEL). The explosive limits depend on the pressure of the environment and on the percentage of comburent present in the atmosphere.
In our case, that is the powder dosage, the classifications are as follows:
|Zones||Declaration of conformity and instructions for use|
|Zone 20||An area in which explosive atmospheres are present, in the form of a flammable cloud of dust in the air, continuously, or for long periods.|
|Zone 21||An area where explosive atmospheres may be present, in the form of a flammable cloud of dust in the air, during normal operations.|
|Zone 22||An area where explosive atmospheres may be present, in the form of a flammable cloud of dust in the air, but only for short periods|
Following various requests for ATEX 21 we therefore opted for the certification of all our series of EC feeders (single screw and double screw) according to the following plate:
Il 2/2D Ex h IIIB T135° Db/Dc
Il 2/2G Ex h IIA T4 Gb/Gb
TECH. FILE REF.
Cert. No AT19-0034952-01