Rosemount 248 - Page 23

Reference Manual
00809-0100-4825, Rev BB
August 2005
2-13
Rosemount 248
Option 1:
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.
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.
4. Ensure that the sensor shield is electrically isolated from the
surrounding grounded fixtures.
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.
4. Ground signal wiring shield at the power supply end.
4–20 mA loop
Sensor Wires
Shield ground point
Transmitter
Sensor Wires
4–20 mA loop
Shield ground point
Connect shields together, electrically isolated from the transmitter
Transmitter
4–20 mA loopSensor Wires
Shield ground point
Transmitter