4
Hochiki Europe (UK) Ltd
2-3-0-809/ISS4/SEP14
Gas Group
Representative Gas
Other Gases, Liquids & Vapours
IIC
Hydrogen
Acetylene, Carbon Disulphide
IIB
Ethylene
Diethyl ether, Tetrafluroethylene
IIA
Methane
Butane, Methanol, Petroleum, Propane, Styrene
These Flame Detectors are approved
IIC
for listed gases in EN 50014.
Table 4
– Subdivisions of Group II Gases
Temperature
Class
Referred to
ambient of
-20°C to +40°C
Maximum Surface
Temperature
T6
85°C
T5
100°C
T4
135°C
T3
200°C
T2
300°C
T1
450°C
Detectors approved to T4 at 40°C
Table 3
– Temperature Classifications
Code
Type of
Protection
Code
Equipment
Category
ia
Intrinsic safety
1
ib
Intrinsic safety
2
d
Flameproof
3
These Flame Detectors are approved ia.
Table 2
– Type of Protection Codes