Emerson Rosemount 5408 Reference Manual page 76

Electrical installation
February 2020
4.3.5 Power supply
The transmitter operates on 12-42.4 Vdc (12-30 Vdc in Intrinsically Safe installations) at
the transmitter terminals.
4.3.6 Load limitations
For HART
loop resistance is determined by the voltage level of the external power supply.
Figure 4-3: Load Limits
Maximum Loop Resistance = 43.5 * (External Power Supply Voltage - 12)
A. Loop Resistance (Ohms)
B. External Power Supply Voltage (Vdc)
76
®
communication, a minimum loop resistance of 250 Ω is required. Maximum
Reference Manual
00809-0100-4408
Reference Manual