Overview; Safety Messages; Wiring And Powering The Transmitter - Emerson Rosemount 644 HART Reference Manual

Reference Manual
00809-0100-4728, Rev MB
Section 4
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 53
Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 53
Wiring and powering the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 53
4.1

Overview

The information in this section covers installation considerations for the Rosemount 644 Transmitter. A
Quick Start Guide is shipped with every transmitter to describe mounting, wiring, and basic
configuration procedures for initial installation.
4.2

Safety messages

Instructions and procedures in this section may require special precautions to ensure the safety of the
personnel performing the operations. Information that potentially raises safety issues is indicated by a
warning symbol ( ). Refer to the following safety messages before performing an operation preceded
by this symbol.
Explosions could result in death or serious injury
Installation of this transmitter in an explosive environment must be in accordance with the appropriate
local, national, and international standards, codes, and practices. Review the approvals section of the
Rosemount 644 Reference Manual for any restrictions associated with a safe installation.
In an Explosion-Proof/Flameproof installation, do not remove the transmitter covers when power is

applied to the unit.
Process leaks may cause harm or result in death.
Install and tighten process connectors before applying pressure.

Electrical shock can result in death or serious injury.
Avoid contact with the leads and terminals. High voltage that may be present on leads can cause

electrical shock.
4.3

Wiring and powering the transmitter

All power to the transmitter is supplied over the signal wiring. Use ordinary copper wire of sufficient size
to ensure that the voltage across the transmitter power terminals does not drop below 12.0 Vdc.
If the sensor is installed in a high-voltage environment and a fault condition or installation error occurs,
the sensor leads and transmitter terminals could carry lethal voltages. Use extreme caution when
making contact with the leads and terminals.
Electrical Installation
Electrical Installation
Electrical Installation
July 2016
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