Emerson Rosemount 3490 Series Reference Manual page 32

Installation
January 2021
Related information
Change the operating mode
Programming Channel 1 for a HART input (advanced users)
Programming Channel 2 for a HART input (Rosemount 3492 and advanced users only)
Display configuration options
3.4.7 Relay connections
Terminal connections are shown in
3.4.8 Current output connections
The Current Output may be connected in internally-powered or loop-powered mode, as
shown in
required. A minimum of 2.5 Vdc is required across terminals 7 and 8 for correct operation.
The voltage must not exceed 30 Vdc.
Figure 3-10: Internally-powered
A. Load
Figure 3-11: Loop-powered
A. Load
B. External supply
32
Figure 3-10 and Figure 3-11. In loop-powered mode, an external power source is
24V
7
Io
+
8
A
-
0V
9
24V
7
Io
+
8
A
-
0V
9
Table 3-1 and Table 3-2.
+
B
-
Reference Manual
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