Emerson 1700 Manuel D’Utilisation

15

Grounding requirements depend on the installation type (see Figure 2-1

Grounding methods for 

each flowmeter component are listed in Table 2-3.

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

•

Use copper wire, 14 AWG (2,5 mm

2

) 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.

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.

Integral

Sensor / core processor / 
transmitter

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.

4-wire remote

Sensor / core processor 
assembly

See sensor documentation.

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 
processor assembly

Ground according to applicable local standards, using either the 
transmitter’s internal or external ground screw, or the core processor’s 
internal ground screw.

Remote core 
processor with 
remote 
transmitter

Sensor

See sensor documentation.

Core processor

Ground according to applicable local standards, using either the internal 
or external ground screw. 

Transmitter

Ground according to applicable local standards, using either the 
transmitter’s internal or external ground screw.