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Bosch Rexroth H-4WEH...XE Series Operating Instructions Manual page 20

4/2 and 4/3 directional valves, internally pilot-operated, externally pilot-operated
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Product information
Zones, device groups
and categories
Device group
Category
according to
according to
2014/34/EU
2014/34/EU
I
M1
I
M2
II
1G
II
2G
II
3G
II
1D
II
2D
II
3D
Bosch Rexroth AG, H-4WEH...XE..., RE 24751-XE-B/04.16
5.1.2 Explosion protection marking
According to EU directive 1999/92/EC, the user/machine end-user has to classify
potentially explosive atmospheres into zones. In the following table, the
corresponding zones for device groups and categories are shown.
The valve may only be used in the areas and zones which correspond to the device
group and category. During use, also observe the other information on explosion
protection in "Data sheet 24751-XE".
Table 7: Device groups and categories
Area of application, properties (excerpt from the directives)
Areas susceptible to firedamp (=device group I), i.e.: underground mines and their
pitheads. If there is an explosive atmosphere, the operation can continue.
Very high level of safety.
Areas susceptible to firedamp (=device group I), i.e.: underground mines and their
pitheads. If there is an explosive atmosphere, it must be possible to switch off
the device.
High level of safety.
Potentially explosive atmospheres in which explosive gasses, mists or vapors
(=device group II) occur permanently or for a long time or frequently.
Corresponds to zone 0 according to directive 1999/92/EC.
Very high level of safety.
Potentially explosive atmospheres in which explosive gasses, mists or vapors
(=device group II) occur sometimes.
Corresponds to zone 1 according to directive 1999/92/EC.
High level of safety.
Potentially explosive atmospheres in which explosive gasses, mists or vapors
(=device group II) do not normally occur or only rarely or for a short time.
Corresponds to zone 2 according to directive 1999/92/EC.
Standard level of safety.
Potentially explosive atmospheres in which explosive dust/air mixtures (=device
group II) occur permanently or for a long time or frequently.
Corresponds to zone 20 according to directive 1999/92/EC.
Very high level of safety.
Potentially explosive atmospheres in which explosive dust/air mixtures (=device
group II) occur sometimes.
Corresponds to zone 21 according to directive 1999/92/EC.
High level of safety.
Potentially explosive atmospheres in which an explosive atmosphere due to blown
up dust (=device group II) does not normally occur or only rarely or for a short time.
Corresponds to zone 22 according to directive 1999/92/EC.
Standard level of safety.
Usable in zone
according to
1999/92/EC
-
-
0, 1, 2
1, 2
2
20, 21, 22
21, 22
22

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