Emerson Rosemount 644 FOUNDATION Reference Manual page 45

Reference Manual
00809-0400-4728, Rev CA
Option 1
1. Connect signal wiring shield to the sensor wiring shield.
2. Ensure the two shields are tied together and electrically isolated from the transmitter housing.
3. Ground shield at the power supply end only.
4. Ensure that the sensor shield is electrically isolated from the surrounding grounded fixtures.
A. Sensor wires
B. Transmitter
5. Connect shields together, electrically isolated from the transmitter.
Option 2
1. Connect sensor wiring shield to the transmitter housing (only if the housing is grounded).
2. Ensure the sensor shield is electrically isolated from surrounding fixtures that may be grounded.
3. Ground signal wiring shield at the power supply end.
ensor Wires
A
A. Sensor wires
B. Transmitter
Option 3
1. Ground sensor wiring shield at the sensor, if possible.
2. Ensure that 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.
Installation
A
C
Shield ground point
C
B
D
C. Shield ground point
D. F Fieldbus segment
OUNDATION
B
Transmitter
D
C. Shield ground point
D. F Fieldbus segment
OUNDATION
Installation
September 2018
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