Formula Air BADA000018 Manuale di manutenzione - Pagina 13
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4 ATEX CERTIFICATION
EXPLOSIVE ATMOSPHERE DANGER
This symbol indicates information concerning the directive ATEX 2014/34/EU.
Every information attended by this symbol must be executed by highly qualified personnel,
competent in safety environments regarding to places characterized by the presence of potentially
explosive atmospheres.
4.1
Potentially explosive atmosphere
An explosive atmosphere for the purpose of Directive 2014/34/EU is defined as a mixture with air,
under atmospheric condition, of flammable substances in the form of gases, vapors, mists or dusts in
which, after ignition has occurred, combustion spreads to the entire unburned mixture.
A potentially explosive atmosphere is an atmosphere which could become explosive due to local
and operational conditions.
4.1.1 Dangerous areas classification
In carrying out the obligations laid down in Directive 99/92/EC, hazardous places are classified in
terms of zones on the basis of the frequency and duration of the occurrence of an explosive
atmosphere.
Zone 0: A place in which an explosive atmosphere consisting of a mixture with air of flammable
substances in the form of gas, vapor or mist is present continuously or for long periods for frequently.
Zone 1: A place in which an explosive atmosphere consisting of a mixture with air of flammable
substances in the form of gas, vapor or mist is likely to occur in normal operation occasionally.
Zone 2: A place in which an explosive atmosphere consisting of a mixture with air of 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 a short period only.
Zone 20: A place in which an explosive atmosphere in the form of a cloud of combustible dust in air
is present continuously, or for long periods or frequently.
Zone 21: A place in which an explosive atmosphere in the form of a cloud of combustible dust in air
is likely to occur in normal operation occasionally.
Zone 22: A place in which an explosive atmosphere in the form of a cloud of combustible dust in air
is not likely to occur in normal operation but, if it does occur, will persist for a short period only.
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