Installation guide

Quick Installation Guide
00825-0100-4825, Rev DB
February 2011
Rosemount 248
10
STEP 4 CONTINUED...
Ground the Transmitter
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).
Option 1 (for grounded housing):
1. Connect sensor wiring shield to the transmitter housing.
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.
Option 2 (for ungrounded housing):
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.
Ensure that the sensor shield is electrically isolated from the surrounding grounded fixtures.
4–20 mA loop
Sensor Wires
Transmitter
Shield ground point
Sensor Wires
4–20 mA loop
Connect shields together, electrically isolated from the transmitter
Transmitter
Shield ground point
00825-0100-4825.fm Page 10 Friday, February 18, 2011 11:49 AM