Emerson Micro Motion 5700 Installation Manual page 31

Installation Manual
MMI-20029969
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
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
Installation Manual
Add the Rbarrier and loop resistor D together to determine the proper Supply Voltage
VDC(Volts). See mA Output loop resistance.
Wiring the channels
February 2020
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