Grounding The Flowmeter Components - Emerson MICRO MOTION 2700 Installation Manual

Installing the Transmitter
2.6

Grounding the flowmeter components

Grounding requirements depend on the installation type (see Figure 2-1
each flowmeter component are listed in Table 2-3.
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.
If national standards are not in effect, follow these grounding guidelines:
• Use copper wire, 14 AWG (2,5 mm
Keep all ground leads as short as possible, less than 1 Ω impedance.
•
• Connect ground leads directly to earth, or follow plant standards.
Table 2-3 Grounding methods for flowmeter components
Installation
architecture Components
Integral Sensor / core processor /
transmitter
4-wire remote Sensor / core processor
assembly
Transmitter
9-wire remote Sensor / junction box
Transmitter / core
processor assembly
Remote core Sensor
processor with
Core processor
remote
transmitter
Transmitter
Installation Manual
CAUTION
2
) or larger wire size, for grounding.
Grounding method
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.
See sensor documentation.
Ground according to applicable local standards, using either the
transmitter's internal or external ground screw.
See sensor documentation.
Ground according to applicable local standards, using either the
transmitter's internal or external ground screw, or the core processor's
internal ground screw.
See sensor documentation.
Ground according to applicable local standards, using either the internal
or external ground screw.
Ground according to applicable local standards, using either the
transmitter's internal or external ground screw.
).
Grounding methods for
15