Emerson Rosemount Smart Wireless THUM, Reference Manual, Page: 22 / 60

Reference Manual
00809-0100-4075, Rev BA
October 2010
Smart Wireless THUM Adapter
3-4
Wiring
NOTE:
In order for the THUM Adapter to function properly there must be at least 250
Ohms resistance in the loop. If the 4–20 mA loop does not have the required
resistance, wire a resistor as shown in Figure 3-20, Figure 3-22, or
Figure 3-24 as applicable.
When adding a load resistor ensure that uninsulated conductors do not
contact the enclosure and/or other exposed metal parts.
Figure 3-3. Direct Mount Wiring
Diagram for 2-Wire Device
NOTE:
In order for the THUM Adapter to function properly there must be at least 250
Ohms resistance in the loop. If the 4–20 mA loop does not have the required
resistance, wire a resistor as shown in Figure 3-6, 3-10, or 3-13 as applicable.
Figure 3-4. Remote Mount
Wiring Diagram for 2-Wire
Device
Splice Connector
Wired Device
4-20 mA Loop -
4-20 mA Loop +
Ground
- PWR / COMM
+ PWR / COMM
THUM Adapter
Green
Red
Black
White
Yellow
Load Resistor

250

Power
+
Supply
-
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

+
Power
-
Supply