Emerson Rosemount 3144P - Transmitter Grounding; Grounding Ungrounded Inputs

6.3 Ground the transmitter
6.3.1 Ungrounded thermocouple, mV, and RTD/ohm inputs
Each process installation has different requirements for grounding. Use the
grounding options recommended by the facility for the specific sensor type
or begin with grounding option 1 (the most common).
Ground the transmitter: option 1
Emerson recommends this option for ungrounded transmitter housing.
Procedure
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. Remote sensor housing
B. Sensor
C. Transmitter
D. Shield ground points
Ground the transmitter: option 2
Emerson recommends this method for grounded transmitter housing.
Procedure
1. Connect sensor wiring shield to the transmitter housing.
Do this only if the housing is grounded.
2. Ensure that the sensor is electrically isolated from surrounding
fixtures that may be grounded.
3. Ground signal wiring shield at the power supply end.
March 2021 Quick Start Guide
Quick Start Guide 15