Emerson Rosemount 5400 Series Reference Manual page 182

Section 8: Safety Instrumented Systems (4-20 mA Only)
November 2014
The HART loop must be referenced to ground in one point located between the power supply
and the load resistor. Either the negative or the positive pole of the power supply can be ground
referenced, depending on the placement of the load resistor. See
Figure 8-1. Reference Ground when the Load Resistor is Inserted in the Negative Line
Single point loop
ground reference
Table 8-2. Minimum Input Voltage (U
Hazardous approval
Non-hazardous Installations and
intrinsically safe installations
Explosion-proof / flameproof
installations
170
Power supply
Load resistor
Rosemount 5400
Series transmitter
Transmitter
housing ground
) at Different Currents
i
Current
3.75 mA 21.75 mA
Minimum input voltage (U
16 Vdc 11 Vdc
20 Vdc 15.5 Vdc
Safety Instrumented Systems (4-20 mA Only)
Reference Manual
00809-0100-4026, Rev HA
Figure 8-1 as an example.
)
i