Emerson Rosemount Smart Wireless THUM, Reference Manual

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Reference Manual
00809-0100-4075, Rev BA
October 2010
Smart Wireless THUM Adapter
3-8
Figure 3-11. Direct Mount Wiring
Diagram for 4-Wire Active
Device
NOTE:
An active loop exists when the wired device is supplying the power to the 4-20
mA loop. It is important to verify if the wired device is operating in active or
passive mode.
Figure 3-12. Remote Mount
Wiring Diagram for 4-Wire
Active Device
Splice Connector
Wired Device
4-20 mA Loop -
4-20 mA Loop +
Ground
THUM Adapter
Green
Yellow
White
Black
Red
Input
Card
Powe
r+
Powe
r-
CO
MM+
CO
MM-
Load Resistor

250

Remote Mount Housing
4-20 mA Loop -
4-20 mA Loop +
Ground
+ COMM
- COMM
THUM Adapter
Green
Red
Black
White
Yellow
To Wired Device
Shield Wire
Load Resistor

250

Input
Card