Channel Power Requirements - Emerson Micro Motion 4200 Installation Manual

Wiring the channels
April 2019
3.4

Channel power requirements

The supply voltage required by the 4200 transmitter depends on the total resistance in the
mA loop. This includes all sense resistance and wire resistance.
Channel A mA HART terminal requirements
Use the chart below to determine the required supply voltage for Channel A based on loop
resistance.
Figure 3-1: Channel A output supply voltage and loop resistance
A. Loop resistance (Ohms)
B. Supply voltage (Vs)
C. Maximum Loop Resistance (Ohms)
Table 3-2: For maximum loop resistance for Channel A
Condition
17.75V < Vs <19.6V
19.6V < Vs < 21.5V
21.5V <Vs <30V
Note
If display backlighting is enabled (refer to
input voltage required is 1V higher than the chart indicates.
24
Equation
(Vs-17.75)/3.6mA
(Vs-8.32V)/22mA
600 ohms
Configure the display backlight) , the minimum
Micro Motion
Installation Manual
MMI-20058013
®
4200 2-Wire Transmitter