58
Reference Manual
00809-0100-4728, Rev MB
July 2016
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
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
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 the sensor shield is electrically isolated from the surrounding grounded fixtures.
5. Connect shields together, electrically isolated from the transmitter.
Summary of Contents for Rosemount 644 HART
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Page 16: ...6 Reference Manual 00809 0100 4728 Rev MB Introduction July 2016 Introduction ...
Page 86: ...76 Reference Manual 00809 0100 4728 Rev MB Troubleshooting July 2016 Troubleshooting ...
Page 138: ...128 Reference Manual 00809 0100 4728 Rev MB Index July 2016 Index ...
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