Chapter 5 Grounding - Emerson Micro Motion TA Series Installation Manual

Installation Manual
MMI-20040393
5 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
Use the following guides for grounding practices:
• In Europe, IEC 60079-14 is applicable to most installations, in particular sections
16.2.2.3 and 16.2.2.4.
• In the U.S.A. and Canada, ISA 12.06.01 Part 1 provides examples with associated
applications and requirements.
If no external standards are applicable, follow these guidelines to ground the sensor:
• Use copper wire, 14 AWG (2.08 mm²) 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.
NOTICE
Ground the flowmeter to earth, or follow ground network requirements for the facility.
Improper grounding can cause measurement error.
Procedure
• Check the joints in the pipeline.
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Installation Manual
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.
Tip
The sensor electronics may be a transmitter, core processor, or junction box. The
grounding screw may be internal or external.
Grounding
May 2021
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