7 atex – JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual User Manual
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electrical circuits cannot have an effect on the intrinsically safe electrical circuits.
Brackets are used for the identification marking of the associated apparatus: e.g. II (1) G [Ex ia] II C.
Associated electrical apparatus can be used in potentially explosive areas if appropriate protection is provided (ignition protec-
tion according to EN 60079-0). If there is insufficient protection, the apparatus must be used outside of the potentially explo-
sive area.
Example:
The JUMO safety
M STB/STW Ex is not in a potentially explosive area, but it is connected to a thermocouple that is in a poten-
tially explosive area. Only the input electrical circuit of the JUMO safety
M STB/STW Ex is intrinsically safe.
The screw terminals that are marked blue and the connected lines are protected with a cover cap.
Figure 6: Cover cap
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