Buhler GAS 222.30 Ex2, Installation And Operation Instructions Manual

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GAS 222.30 Ex2
4.7.1 Version With Terminal Box
This probe version includes a terminal box. All electrical connections are factory connected to the terminals in the terminal box.
Connect the respective power supply for the solenoid valves to the terminals per the connection diagram.
The probe may only be operated using the Ex e cable fittings and the terminal box closed. Never change the terminal assign-
ment.
4.7.2 Connecting the Earth Conductor/Earthing
Always connect all of the designated connections on your unit to your protective conductor system. Connect the earth to the ad-
ditional equipotential bonding conductor connection on the housing.
4.7.3 Solenoid Valves (Optional)
DANGER Explosion hazard when opening the solenoid valve housing
The solenoid valve is a closed system. It must not be removed!
A fuse suitable for the rated current (max. 3 x Ib per IEC 60127-2-1) or a protective motor switch with short circuit and fast
thermal response (set for rated current) must be connected upstream from each magnet to prevent short-circuits.
– For magnets with a very low rated current, a fuse of the lowest current value under the IEC standard will suffice. This fuse
must be connected separately, upstream.
– The rated fuse voltage must be equal to or greater than the specified nominal voltage (U
N
+10 %) of the magnet. The fuse rat-
ing is specified in the type plate of the solenoid valve.
– The limiting breaking capacity of the fuse element must be equivalent to or greater than the maximum short-circuit current
expected at the installation site (typically 1500 A).
DANGER Potential equalization/static charge
Static charges can result in incendive sparking.
Avoid static charges. All conductive probe parts must be earthed!
The housing has a connection for an earth/equipotential bonding conductor. Ensure the
housing is adequately earthed (minimum conductor cross-section 4 mm
2
).
Particularly also observe the requirements of IEC/EN 60079-14!
4.7.4 Limit Switch (Optional)
The optimal limit switch has a separate terminal box with terminals (terminal diagram see "Appendix").
11 Bühler Technologies GmbH BE460064 ◦ 08/2019