ABB TZIDC-110 Operating Instruction page 19

TZIDC-110, TZIDC-120 DIGITAL POSITIONER | OI/TZIDC-110/TZIDC-120-EN REV. H
Special conditions
• Devices must only be connected to circuits in zone 2 if they
are suitable for operation in zone 2 potentially explosive
atmospheres and for the conditions prevailing at the
installation location (manufacturer's declaration or
certificate from an inspection authority).
• For the 'Feedback on the actuator position using proximity
switches' circuit, measures outside of the device must be
implemented to prevent an up-scale of the rated voltage by
more than 40 % in the event of transient disturbances.
• It is only permissible to connect, disconnect, and switch live
circuits during installation or maintenance, or for the
purpose of carrying out repairs. Comment: It is considered
very unlikely that a potentially explosive atmosphere would
be present in zone 2 at the same time that installation or
maintenance/repair work was being carried out.
• Only non-flammable gases may be used for the pneumatic
auxiliary power.
• Only use suited cable entries that meet the requirements of
EN 60079-15.
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