Emerson 2700 Grounding the flowmeter components, 3Grounding methods for flowmeter components

Installing the Transmitter

2.6Grounding 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.

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.

If national standards are not in effect, follow these grounding guidelines:

•Use copper wire, 14 AWG (2,5 mm2) 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.

Table 2-3Grounding methods for flowmeter components

Installation
architecture	Components	Grounding method
Integral	Sensor / core processor /	Ground via piping, if possible (see sensor documentation). Otherwise,
	transmitter	ground according to applicable local standards using either the
		transmitter’s internal or external ground screw.
4-wire remote	Sensor / core processor	See sensor documentation.
	assembly
	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	Ground according to applicable local standards, using either the
	processor assembly	transmitter’s internal or external ground screw, or the core processor’s
		internal ground screw.
Remote core	Sensor	See sensor documentation.
processor with
	Core processor	Ground according to applicable local standards, using either the internal
remote
		or external ground screw.
transmitter
	Transmitter	Ground according to applicable local standards, using either the
		transmitter’s internal or external ground screw.

Before You Begin

Installing the Transmitter

Sensor Wiring

Output Wiring – Analog

Installation Manual 15