Grounding The Flowmeter Components; Grounding For Integral Installations; Grounding For 4-Wire Remote Installations - Emerson Micro Motion 2700 Installation Manual

Installing the Transmitter continued
2.5

Grounding the flowmeter components

Grounding requirements depend on the installation type (see Figure 2-1
If national standards are not in effect, follow these transmitter 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.
2.5.1

Grounding for integral installations

In integral installations, because all the components are mounted together, only a single ground is
required. The preferred method is to ground the sensor/core processor/transmitter assembly through
the piping, if the piping meets applicable grounding standards.
If this is not possible, the transmitter has both an internal and an external grounding screw (see
Figures 2-4 and 2-9). Ground the assembly according to applicable local standards.
2.5.2

Grounding for 4-wire remote installations

In 4-wire remote installations, one ground is required for the sensor/core processor assembly, and a
separate ground is required for the transmitter.
The transmitter has both an internal and an external grounding screw (see Figures 2-4 and 2-9).
Ground the transmitter according to applicable local standards.
The preferred method for grounding the sensor/core processor assembly is through the piping, if the
piping meets applicable grounding standards. If this is not possible, use the grounding screw on the
core processor. Ground the sensor/core processor assembly according to applicable local standards.
Transmitter Installation: Model 1700 and 2700 Transmitters
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 ATEX, IECEx, UL, or CSA
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.
2
) or larger wire size, for grounding.
).
15