Wire And Apply Power - Emerson Rosemount 644 Quick Start Manual

February 2015
Step 4: Wire and apply power
Wire the sensor to the transmitter
The wiring diagram is located on the device's top label below the terminal screws
Figure 5. 644 Head Mount - Single and Dual Input Wiring Diagrams
*The transmitter must be configured for at least a 3-wire RTD in order to recognize an RTD with a
compensation loop.
** Rosemount Inc. provides a 4-wire sensors for all single element RTDs. Use these RTDs in 3-wire
configurations by leaving the unneeded leads disconnected and insulated with electrical tape.
644 Head Mount Transmitter
Quick Start Guide
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