Emerson Micro Motion 5700 Installation Manual page 32

Wiring the channels
August 2020
Figure 4-9: mA Output wiring in a hazardous area
A. mA Output
B. Channel B
C. 10–30 VDC (maximum)
D. Loop resistor
E. Measurement device
F. Safety barrier
G. Rbarrier
Add the Rbarrier and loop resistor D together to determine the proper Supply Voltage VDC(Volts).
mA Output loop resistance
Figure 4-10: mA Output: loop resistance
A. Loop resistor (ohms)
B. Supply voltage VDC (V)
C. Rmax = maximum value of loop resistor allowed
D. Rmin = minimum value of loop resistance required
Loop resistance equation
Rmax = (Vsupply − 10V) / 0.023
Rmin = 0 Ω, Vsupply ≤ 25V
Rmin = 200 Ω, Vsupply > 25V
32
Installation Manual
Micro Motion 5700 transmitters for PROFIBUS PA
MMI-20075112