Piusi EX50 Installation, Gebrauch Und Wartung Seite 19

EN (Translation of the original language)
3.1 DEFINITION OF CLASSIFIED ZONES
FOREWORD Definition of zones as shown in directive 99/92/CE
ZONE 0 Place where an explosive atmosphere made up of a mix of air and inflammable sub-
stances in the form of gas, vapour or mist is continuously present, either for long peri-
ods or frequently.
Note: Generally speaking, said conditions, when they occur, involve the inside of tanks,
pipes and containers, etc.
ZONE 1 Place where it is probable that an explosive atmosphere, made up of a mix of air and
inflammable substances in the form of gas, vapour or mist, can occur occasionally dur-
ing normal operation.
Note: Said zone can also include:
- places in the immediate vicinity of zone 0;
- places in the immediate vicinity of supply openings;
- places in the immediate vicinity of filling and and emptying openings;
- places in the immediate vicinity of appliances, protection systems and fragile glass and ceramic
components, or components made of other similar materials;
- places in the immediate vicinity of inadequately sealed stuffing boxes, e.g., on pumps
and valves with stuffing box.
ZONE 2 Place where it is improbable that an explosive atmosphere, made up of a mix of air and
inflammable substances in the form of gas, vapour or mist, can occur during normal
operation, but which, if it does occurs, only persists for a short time.
Note: Said zone can include, among others, places surrounding the zones 0 or 1.
ZONE 20
Place where an explosive atmosphere in the form of a cloud of combustible powders in
the air is continuously present, either for long periods or frequently.
Note: Generally speaking, said conditions, when they occur, involve the inside of tanks,
pipes and containers, etc.
ZONE 21 Place where it is probable that an explosive atmosphere, in the form of a cloud of combustible pow-
ders in the air, can occur occasionally during normal operation.
Note: Said zone can include, for example, among others, places in the immediate vicinity of
powder loading and emptying points and places where powder layers form or which, during
normal operation, could produce an explosive concentration of combustible powders mixed
with the air.
ZONE 22 Place where it is improbable that an explosive atmosphere, in the form of a cloud of
combustible powders in the air, occur during normal operation but which, if it does oc-
cur, only persists for a short time.
Note: This zone can comprise, among others, places near appliances, protections sys-
tems and components containing powder, out of which the powder can come out due
to leaks with the formation of powder deposits (e.g., milling salt, where the powder
comes out of the mills and deposits).
ZONE 1
ZONE 2
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EX50 230V 50/60Hz
ZONE 0
ZONE 20
ZONE 21
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