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1.2 INSTALLATION AREA
This actuator is a category 2 explosion-proof equipment and can be used in the following areas
depending on the marking :
EPL = Equipment’s Protection Level. b= high level Gas (G) and Dust (D).
Zone 1 (gas) & 21 (dust): the explosive atmosphere is likely to occur occasionally in normal operation.
Zone 2 (gas) & 22 (dust): the explosive atmosphere is not likely to occur in normal operation but
if it does occur, it will persist for a short period of time only.
This product is desig-
ned for a use in surface
industries group IIB,
IIB+H2 or IIC.
(*) Other gas, please consult a notified body (INERIS or LCIE i.e)
The temperature class corresponds to the actuator maximum surface temperature.
1.3 CAUTIONS FOR ELECTRICAL CONNECTION
Opening the covers
To avoid any risk of explosion, do not open when explosive atmosphere may be present. It is prefe-
rable that the actuator electric control and power supply are switched off before opening the cover.
Be careful not to damage the joint surfaces of the cover.
The explosion proof joint may be lubricated with a grease that does not become hard and is anticorrosion
(example TOTAL N31271 or SHELL TIVELLA GLOO).
Be careful not to damage the gaskets when repositioning the cover onto the actuator body. Tighten
each cover screw.
Group Typical gas (*)
IIB Ethylene
IIB + H2 Hydrogen
IIC Hydrogen, Acetylene
Class Max surface temperature
T4 135°C
T5 100°C
T6 85°C
WARNING
This device has not been designed to be operated in areas where the risk
of getting explosive atmosphere, frequently or during long periods, is high (Zone 0).
Actuator type STX.., ST175, ST220 SQX
Protection Ex d, Ex de, Ex tb Ex d, Ex tD Ex d , Ex de, Ex tb
Category 2 (EPL Gb, Db) 2 2 (EPL Gb, Db)
Areas 1 or 2 21 or 22 1 or 2 21 or 22 1 or 2 21 or 22
Atmosphere G Gas D Dust G Gas D Dust G Gas D Dust
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