Technical data

Flow Meter FC01-Ex Flow Meter FC01-Ex
2 Ex atmosphere - Definitions and mounting instructions 2 Ex atmosphere - Definitions and mounting instructions
2.2 Classification Zones
Classification zones are described for areas where combustible gases, vapours or mist consti-
tute an explosive hazard. When determining the explosion hazard, i.e. when categorising explo-
sive areas, the "directives for avoiding the risks of explosive atmospheres with examples (ExRL)”
have to be taken into account. In special cases or in case of doubt the determination is done by
the supervising authorities.
2.2.1 Equipment group II, category 1 (Zones 0 and 20)
Equipment of this category is for use in areas where an explosive atmosphere consisting of gas,
vapour, mist (zone 1) or of inflammable dust/air mixtures (zone 20) is present continuously or for
long periods. Normally this applies only to the inside of containers or apparatus (vaporizers, pipe
systems etc.). In these zones only electrical apparatus must be used carrying an EC type test
certificate issued by an acknowledged authority and only those which have been explicitly
approved for these zones.
2.2.2 Equipment group II, category 2 (Zones 1 and 21)
Equipment of this category is for use in areas where an explosive atmosphere consisting of gas,
vapour, mist (zone 1) or a cloud of inflammable dust in air (zone 21) is likely to occur. This may be
the case for the surroundings of zones of category 1, the surrounding area of filling or draining
systems.
For zone 21 these are also areas where dust deposits occur and during normal operation may
build up an explosive concentration of inflammable dust in combination with air.
2.2.3 Equipment group II, category 3 (Zones 2 and 22)
Equipment of this category is for use in areas where an explosive atmosphere consisting of gas,
vapour, mist (zone 2) or a cloud of inflammable dust in air (zone 22) is unlikely to occur. If it does,
it would be infrequent and for a short time. This may be the case for the surroundings of zones
0 and 1 as well as areas around flange connections or pipe lines in closed areas.
For zone 22 it could also be surroundings of dust-containing apparatus, protective systems and
components which might lose dust from leakages and build up dust deposits (e.g. mill rooms,
clean air side of filters in outlet air pipes).
(Information according to ExRL, EN50014, EN50281)
2.2 Classification Zones
Classification zones are described for areas where combustible gases, vapours or mist consti-
tute an explosive hazard. When determining the explosion hazard, i.e. when categorising explo-
sive areas, the "directives for avoiding the risks of explosive atmospheres with examples (ExRL)”
have to be taken into account. In special cases or in case of doubt the determination is done by
the supervising authorities.
2.2.1 Equipment group II, category 1 (Zones 0 and 20)
Equipment of this category is for use in areas where an explosive atmosphere consisting of gas,
vapour, mist (zone 1) or of inflammable dust/air mixtures (zone 20) is present continuously or for
long periods. Normally this applies only to the inside of containers or apparatus (vaporizers, pipe
systems etc.). In these zones only electrical apparatus must be used carrying an EC type test
certificate issued by an acknowledged authority and only those which have been explicitly
approved for these zones.
2.2.2 Equipment group II, category 2 (Zones 1 and 21)
Equipment of this category is for use in areas where an explosive atmosphere consisting of gas,
vapour, mist (zone 1) or a cloud of inflammable dust in air (zone 21) is likely to occur. This may be
the case for the surroundings of zones of category 1, the surrounding area of filling or draining
systems.
For zone 21 these are also areas where dust deposits occur and during normal operation may
build up an explosive concentration of inflammable dust in combination with air.
2.2.3 Equipment group II, category 3 (Zones 2 and 22)
Equipment of this category is for use in areas where an explosive atmosphere consisting of gas,
vapour, mist (zone 2) or a cloud of inflammable dust in air (zone 22) is unlikely to occur. If it does,
it would be infrequent and for a short time. This may be the case for the surroundings of zones
0 and 1 as well as areas around flange connections or pipe lines in closed areas.
For zone 22 it could also be surroundings of dust-containing apparatus, protective systems and
components which might lose dust from leakages and build up dust deposits (e.g. mill rooms,
clean air side of filters in outlet air pipes).
(Information according to ExRL, EN50014, EN50281)