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Product information
Bosch Rexroth AG
, M-.SED 10...XN..., RE 22045-XN-B/05.17
The classification (see table 8) is based on the maximum gap width determined in
experiments or on the minimum ignition current ratio for the explosive atmosphere
in which a device may be installed (see IEC 60079-20-1).
Explosion group IIA contains less dangerous substances, explosion group IIC the
most dangerous substances. Products intended for a particular explosion group may
always also be used in less dangerous zones.
Table 8: Examples for the classification of gasses, mists and vapors into explosion groups
Explosion group
Examples for gasses, mists and vapors
Dangerousness
IIA
Acetone, ammonia, gasoline, benzene, carbon dioxide,
ethanol, methane, hydrogen sulfide, propane
medium
IIB
Ethylene, city gas, acetaldehyde
high
IIC
Hydrogen, carbon disulfide, acetylene
very high
Please note that in atmospheres which are potentially explosive due to explosive
gasses, mists or vapors (zone 0, 1, 2 for which device group II, categories 1G, 2G
and 3G are intended), the maximum surface temperature of the directional valve
must in addition be below the ignition temperature of the surrounding explosive gas,
mist or vapor.
Based on their maximum surface temperature, these hydraulic products are
classified according to EN 13463-1 and EN 60079-0 into temperature classes
T1 to T6. With hydraulic products in device group II and in categories 1G, 2G
and 3G, the temperature class is part of the explosion protection mark, see
"Data sheet 22045-XN". It provides information on the suitability of the hydraulic
product for the use in a particular atmosphere which is potentially explosive due to
explosive gasses, mists or vapors.
Table 9: Temperature classes for device group II
Temperature class
Maximum surface temperature
T1
450 °C
T2
300 °C
T3
200 °C
T4
135 °C
T5
100 °C
T6
85 °C
Classification of gasses,
mists and vapors into
explosion groups
Temperature classes for
device group II
