Emerson Rosemount 3051 Reference Manual page 38

Section 2: Installation
November 2012
Signal wiring
Do not run signal wiring in conduit or open trays with power wiring or near heavy electrical
equipment. It is important that the instrument cable shield be:



For 4-20 mA HART output, the signal wiring may be grounded at any one point on the signal
loop or may be left ungrounded. The negative terminal of the power supply is a recommended
grounding point.
For 1-5 Vdc HART Low Power output, the power wires may be grounded at only one point or left
ungrounded. The negative terminal of the power supply is a recommended grounding point.
Transmitter case
Always ground the transmitter case in accordance with national and local electrical codes. The
most effective transmitter case grounding method is a direct connection to earth ground with
minimal impedance. Methods for grounding the transmitter case include:

Figure 2-22. Internal ground screw
28
Trimmed close and insulated from touching the transmitter housing
Connected to the next shield if cable is routed through a junction box
Connected to a good earth ground at the power supply end
Internal Ground Connection: The Internal Ground Connection screw is inside the FIELD
TERMINALS side of the electronics housing. This screw is identified by a ground symbol
( ). The ground connection screw is standard on all Rosemount 3051 transmitters.
Refer to Figure 2-22.
Reference Manual
00809-0100-4001, Rev JA
Internal Ground
Connection Screw
Installation