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3.8 Ground the flowmeter components
In a remote core processor with remote sensor installation, the transmitter, remote core
processor, and sensor are all grounded separately.
CAUTION!
Improper grounding could cause inaccurate measurements or flow meter failure. Failure to
comply with requirements for intrinsic safety in a hazardous area could result in an explosion.
Note
For hazardous area installations in Europe, refer to standard EN 60079-14 or national standards.
If national standards are not in effect, adhere to the following guidelines for grounding:
• Use copper wire, 14 AWG (2.5 mm
2
) or larger wire size.
• Keep all ground leads as short as possible, less than 1 Ω impedance.
• Connect ground leads directly to earth, or follow plant standards.
1. Ground the sensor according to the instructions in the sensor documentation.
2. Ground the DIN rail.
The rail clip in the base of the transmitter housing grounds the transmitter to the
DIN rail.
3. Ground the remote core processor according to applicable local standards, using
the remote core processor’s internal ground screw.
Remote core processor internal ground screwFigure 3-23:
Mounting and sensor wiring for remote core processor with remote sensor installations
Installation Manual 33