VIDEOTECH EXH, Operating Instructions Manual, Page: 37 / 78

Page 15 MNVCEXH_0702
The following table shows the classification of a some gases and steams on the basis of the groups of
explosion-proof protection and to the temperatures.
T1 T2 T3 T4 T5 T6
I Methane
IIA Acetone n-butane Benzine Acetaldehyde Ethyl nitrate
Ethane n-butyl Diesel fuel Ethyl ether
Ethyl acetate Aircraft fuel
Ammonia Heating Oil
Benzene
(pure)
n-hexane
Acetic acid
Carbon
monoxide
Methanol
Propane
Toluene
IIB Ethylene
IIC Hydrogen
Acetylene Carbon
disulphide
Note:
The class of superior temperature automatically covers the lower ones (T6 is better than T1).
The IIB class also covers the IIA.
The IIC class also covers the IIB and IIA.
Temperature class
T1 T2 T3 T4 T5 T6
Maximum superficial temperature (°)
of the housing (*) admitted by the
relative class 450 300 200 135 100 85
(*) Normally reported to an temperature environment = 50°C. The lowest temperature of ignition of the relative
explosive atmospheres must be higher than the maximum superficial temperature of the housings.