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Reference Manual
00809-0100-4075
Figure 3-18: THUM Adapter only, Powered by a 24 V Power Supply with 1200 Ohm
Resistor to Limit Current to 20 mA
A
Green
C
A. THUM Adapter
B. Remote mount housing
C. Ground
D. 250 Ω resistor
E. 1200 ohm resistor required
F. 24 V power supply
3.7
Loop current test
To verify that the THUM Adapter will work under all conditions, a loop current test should
be performed. This test will exercise the loop under the highest possible voltage drop
conditions.
Procedure
1. Place loop in manual control.
2. Drive loop to high alarm level. For details, see wired device instruction manual.
3. Place the THUM Adapter into fixed voltage drop mode.
Emerson.com/Rosemount
Red
Black
White
Yellow
•
When the THUM Adapter is connected to a valve, this will need to be done at the
current source and not from the valve.
•
When the THUM Adapter is connected to a transmitter, this will need to be
performed at the transmitter.
B
D
Mounting
January 2023
+
F
-
E
33
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