Emerson Rosemount 644R Quick Start Manual page 14

Quick Start Guide
Option 3
1. Ground sensor wiring shield at the sensor, if possible.
2. Ensure the sensor wiring and signal wiring shields are electrically isolated from
the transmitter housing.
3. Do not connect the signal wiring shield to the sensor wiring shield.
4. Ground signal wiring shield at the power supply end.
A. Sensor wires
B. Shield ground point
Grounded thermocouple inputs
Option 4
1. Ground sensor wiring shield at the sensor.
2. Ensure the sensor wiring and signal wiring shields are electrically isolated from
the transmitter housing.
3. Do not connect the signal wiring shield to the sensor wiring shield.
4. Ground signal wiring shield at the power supply end.
A. Sensor wires
B. Shield ground point
14
A
B
C. Transmitter
D. 4–20 mA loop
A
B
D
C. Transmitter
D. 4–20 mA loop
C
D
C
June 2016