Emerson Rosemount 5408 Reference Manual page 70

Electrical installation
March 2023
4.3.6 Load limitations
For HART
resistance (R) is determined by the voltage level of the external power supply (U
R = 43.5 × (U
Figure 4-3: Load Limits
R (Ω)
1400
1200
1000
800
600
400
200
0
4.3.7 Wiring diagram
Figure 4-4: 4-20 mA/HART
A. Handheld communicator
B. Approved IS barrier (for Intrinsically Safe installations only)
C. HART modem
D. Load resistance (≥250 Ω)
E. Current meter
F. Power supply
70
communication, a minimum loop resistance of 250 Ω is required. Maximum loop
®
− 12)
E
1322
782
521
250
17.8
12 20
Communication
®
24
42.4
30 40
Reference Manual
00809-0100-4408
):
E
U E (Vdc)
50
Reference Manual