Conduit Requirements - Emerson Rosemount 8700 Series Quick Installation Manual

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Emerson Rosemount 8700 Series Quick Installation Manual

Table of Contents

4727_revCC_QIG.fm Page 15 Thursday, January 10, 2013 6:08 PM

Quick Installation Guide

00825-0100-4727, Rev CC

January 2013

5: W

TEP

IRING

This wiring section covers the connection between the transmitter and sensor, the 4-20 mA

loop, and supplying power to the transmitter. Follow the conduit information, cable

requirements, and disconnect requirements in the sections below.

Conduit Ports and Connections

Both the sensor and transmitter junction boxes have ports for

connections with optional CM20 or PG 13.5 connections available. These connections

should be made in accordance with national, local, and plant electrical codes. Unused ports

should be sealed with metal plugs. Proper electrical installation is necessary to prevent

errors due to electrical noise and interference. Separate conduits are not necessary for the

coil drive and signal cables, but a dedicated conduit line between each transmitter and

sensor is required. Shielded cable must be used for best results in electrically noisy

environments. When preparing all wire connections, remove only the insulation required to

fit the wire completely under the terminal connection. Removal of excessive insulation may

result in an unwanted electrical short to the transmitter housing or other wire connections.

For flanged sensors installed into an application requiring IP68 protection, sealed cable

glands, conduit, and conduit plugs that meet IP68 ratings are required. Option codes are

available to provide a pre-wired potted and sealed junction box to prevent the ingress of

water. These options still require the use of sealed conduits to meet IP68 protection

requirements.