Electrical Connections; Safety Instructions; Use In Potentially Explosive Atmospheres; Sensor Grounding - ABB ProcessMaster FEM630 Operating Instructions Manual

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F EM63 0 | E L EC TR OM AG N E T I C FLOWM E T E R | O I/F E M6 3 0-EN RE V. A
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Electrical connections

Safety instructions

WARNING
Risk of injury due to live parts .
Improper work on the can result in electric shock.
• Connect the device only with the power supply switched
off.
• Observe the applicable standards and regulations for
the electrical connection.
The electrical connection may only be established by
authorized specialist personnel and in accordance with the
connection diagrams.
The electrical connection information in this manual must be
observed; otherwise, the IP rating may be adversely affected.
Ground the measurement system according to requirements.

Use in Potentially Explosive Atmospheres

Note
• An additional document with Ex safety instructions is
available for measuring systems that are used in
potentially explosive atmospheres.
• Ex safety instructions are an integral part of this manual.
As a result, it is crucial that the installation guidelines and
connection values it lists are also observed.
• The icon on the name plate indicates the following:

Sensor grounding

General information on grounding

Observe the following items when grounding the device:
• For plastic piping or piping with insulating liner, the
ground is provided by the grounding plate or grounding
electrodes.
• When stray potentials are present, install a grounding
plate upstream and downstream of the sensor.
• For measurement-related reasons, the potential in the
station ground and in the piping should be identical.
Note
If the sensor is installed in plastic or earthenware pipelines, or
in pipelines with an insulating liner, compensating currents
may flow through the grounding electrode in special cases
(e.g. with corrosive measuring media, acids and bases)
In the long term, this may destroy the sensor, since the
ground electrode will in turn degrade electrochemically.
In these special cases, the connection to the ground must be
performed using grounding plates. Install a grounding plate
upstream and downstream of the device in this case.