Bosch Rexroth 4WS2EM 10 Series - Temperature classes for device group II

20/48 Product information
BoschRexrothAG, 4WS2EM 10...XL..., RE29583-XL-B/09.20
The classification (seetable 7) 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ISO/IEC 80079-20-1). The explosion groupIIA
includes less hazardous substances, explosion groupIIC includes the most
hazardous substances. Products for acertain explosion group may always be used in
areas with alower hazardousness.
Table 7: Examples for the classification of gasses, mists and steams into explosion groups
Explosion group Examples for gases, 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 areas which are potentially explosive due to explosive gases,
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 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ISO80079-36 and ENIEC 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29583-XL". It provides information on the suitability of the hydraulic
product for the use in aparticular potentially explosive atmosphere due to explosive
gasses, mists or vapors.
Table 8: Temperature classes for device groupII
Temperature class Maximum permissible surface temperature
T1 450°C
T2 300°C
T3 200°C
T4 135°C
T5 100°C
T6 85°C
Classification of gases,
mists and vapors into
explosion groups
Temperature classes for
device groupII