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5.2.2. Intended use in Extraction Fan environments
The machine is designed to operate also with St2 powders. For St3 powders, please contact
MasterWeld's technical department.
In the Extraction Fan version
Table 1 refers to filter applications depending on the category of the product processed.
TABLE 1
LEVEL OF
PROTECTION
CATEGORY
PROTECTIVE PERFORMANCE
OPERATING CONDITIONS
GROUP I
GROUP II
Very high
(Methane)
M1
Two independent means of
protection
or safety guaranteed
even when two faults occur
independently of each other.
The equipment remains
powered and operational
even in the presence of an
explosive atmosphere.
Very high
1
The equipment remains
powered and operational
in zones 0, 1, 2 (G) and/or
20, 21, 22 (D).
High
(Methane)
M2
Protection suitable for
normal operation and heavy duty
conditions.
Power to the equipment
is shut off in case of
an explosive atmosphere.
High
2
Protection suitable for
normal operation and in case
of frequent disturbances or
equipment
in which malfunction is normal.
The equipment remains
powered and operational
in zones 1, 2 (G) and/or
21, 22 (D).
Normal
3
Protection suitable for
normal operation.
The equipment remains
powered and operational
in zones 2 (G) and/or 22 (D).
TABLE 2
SEVERITY
HAZARDOUS AREAS
GAS, VAPOURS, MISTS (G)
DUSTS (D)
An area in which an explosive mixture
is continuously present
AREA 0
AREA 20
An area in which an explosive mixture
is likely to occur in normal operation
AREA 1
AREA 21
An area in which an explosive mixture
is not likely to occur in normal
operation and if it occurs it will exist
only for a short period only.
AREA 2
AREA 22
Tables 3 and 4 refer to the possibility of using the filter depending on the temperature and gas
groups.
