Grounding The Transmitter - Emerson Rosemount 702DX22 Reference Manual

Section 7: Mounting, Wiring Switches and Output
Circuits, Models 702DX32 and 702DX42
February 2013
7.5

Grounding the Transmitter

The 702 transmitter operates with the housing grounded or floating. Floating systems,
however, can cause extra noise that may affect many types of readout devices. If the signal
appears noisy or erratic, grounding at a single point may solve the problem. Grounding of the
electronics enclosure should be done in accordance with local and national installation codes.
Grounding is accomplished through the process connection using the internal or external case
grounding terminal.
Determining Grounding Requirements
Each process installation has different grounding requirements. Use the options recommended
by the facility for the specific switch type, or begin with Option 1, which is the most common.
Grounding the Transmitter with Option 1:
1.
2.
Grounding the Transmitter with Option 2:
1.
2.
Note
Always use facility recommended wiring practices.
76
Connect switch wiring shield to the grounded transmitter housing.
Ensure that the transmitter housing is electrically isolated from the switch wiring.
Ground switch wiring shield at the switch.
Ensure that the switch wiring and shield are electronically isolated from the transmitter
housing.
Mounting, Wiring Switches, and Output Circuits:
Models 702DX32 and 702DX42
Reference Manual
00809-0200-4702, Rev CA