Chapter 4 Grounding - Emerson Micro Motion GDM Installation Manual

Grounding
4 Grounding
The meter must be grounded according to the standards that are applicable at the site.
The customer is responsible for knowing and complying with all applicable standards.
Prerequisites
Micro Motion suggests the following guides for grounding practices:
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If no external standards are applicable, follow these guidelines to ground the meter:
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CAUTION!
Ground the meter to earth, or follow ground network requirements for the facility. Improper
grounding can cause measurement error.
Procedure
Check the joints in the pipeline.
- If the joints in the pipeline are ground-bonded, the sensor is automatically grounded
and no further action is necessary (unless required by local code).
- If the joints in the pipeline are not grounded, connect a ground wire to the grounding
screw located on the sensor electronics.
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In Europe, EN 60079-14 is applicable to most installations, in particular Sections
12.2.2.3 and 12.2.2.4.
In the U.S.A. and Canada, ISA 12.06.01 Part 1 provides examples with associated
applications and requirements.
For IECEx installations, IEC 60079-14 is applicable.
Use copper wire, 18 AWG (0.75 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
) or larger wire size.
Micro Motion ® Gas Density Meters