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Installation Manual 15
Installing the Transmitter
Installing the Transmitter Output Wiring – AnalogSensor WiringBefore You Begin
2.6 Grounding the flowmeter components
Grounding requirements depend on the installation type (see Figure 2-1
). Grounding methods for
each flowmeter component are listed in Table 2-3.
If national standards are not in effect, follow these grounding guidelines:
• Use copper wire, 14 AWG (2,5 mm
2
) or larger wire size, for grounding.
• Keep all ground leads as short as possible, less than 1 Ω impedance.
• Connect ground leads directly to earth, or follow plant standards.
CAUTION
Improper grounding could cause measurement error.
To reduce the risk of measurement error:
• Ground the transmitter to earth, or follow ground network requirements for the
facility.
• For installation in an area that requires intrinsic safety, refer to Micro Motion
approval documentation, shipped with the transmitter or available from the Micro
Motion web site.
• For hazardous area installations in Europe, refer to standard EN 60079-14 if
national standards do not apply.
Table 2-3 Grounding methods for flowmeter components
Installation
architecture Components Grounding method
Integral Sensor / core processor /
transmitter
Ground via piping, if possible (see sensor documentation). Otherwise,
ground according to applicable local standards using either the
transmitter’s internal or external ground screw.
4-wire remote Sensor / core processor
assembly
See sensor documentation.
Transmitter Ground according to applicable local standards, using either the
transmitter’s internal or external ground screw.
9-wire remote Sensor / junction box See sensor documentation.
Transmitter / core
processor assembly
Ground according to applicable local standards, using either the
transmitter’s internal or external ground screw, or the core processor’s
internal ground screw.
Remote core
processor with
remote
transmitter
Sensor See sensor documentation.
Core processor Ground according to applicable local standards, using either the internal
or external ground screw.
Transmitter Ground according to applicable local standards, using either the
transmitter’s internal or external ground screw.