User`s manual

AX2200/AX2300 Instruction Manual Chapter 2 Installation
CM2-AX2000-2001 (Rev. 4, 4/2014) 2-21
4-20 mA Output Connections
The AX2000Series meter has a single 4-20 mA loop. The 4-20 mA loop
current is controlled by the meter electronics. The electronics must be
wired in series with the sense resistor or current meter. The current con-
trol electronics require 12 volts at the input terminals to operate correctly.
The maximum loop resistance (load) for the current loop output is de-
pendent upon the supply voltage and is given in Figure 2-16. The 4-20
mA loop is optically isolated from the flow meter electronics.
R
load
is the total resistance in the loop, including the wiring resistance
(R
load
= R
wire
+ R
sense
). To calculate R
max
, the maximum R
load
for the loop,
subtract the minimum terminal voltage from the supply voltage and divide
by the maximum loop current, 20 mA. Thus:
The maximum resistance R
load
= R
max
= (V
supply
– 12V) / 0.020 A
Figure 2-16. Load Resistance Versus Input Voltage