Emerson Rosemount 644 - Wiring and Power Application; Wiring the Sensor to the Transmitter; Powering the Transmitter

E. Conduit entry
3.2 Wire and apply power
3.2.1 Wire the sensor to the transmitter
Figure 3-1: Rosemount 644 Head Mount - Single and Dual Input
Wiring Diagrams
• The transmitter must be configured for at least a three-wire RTD
in order to recognize an RTD with a compensation loop.
• Emerson provides a four-wire sensors for all single element RTDs.
Use these RTDs in three-wire configurations by leaving the
unneeded leads disconnected and insulated with electrical tape.
Figure 3-2: Rosemount 644 Field Mount — Single and Dual Input
Wiring Diagrams
3.2.2 Power the transmitter
An external power supply is required to operate the transmitter.
Procedure
1. Remove the housing cover (if applicable).
Quick Start Guide April2023
10 Rosemount 644