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• The 4-20 mA passive receivers must not contain a
voltage source to power the loop current. They do
require the addition of a separate isolated power
supply. Typically a supply that delivers 15 to 20
volts DC at 50 mA is sufficient. Wire these as in
Figure 3. Note that some 12-volt DC wall
transformers (as used on portable equipment) may
deliver 15 to 20 volts when they are lightly loaded.
The CUI/Stack #AD-1220M is a commonly
available example of a 12 volt 200mA supply that
will deliver around 18 volts nominal when loaded
below 20 mA.
• Be sure that both the power supply used and the
passive receiver are floating (not connected to earth
ground). If either is not floating, the circuit will not
work and damage may occur.
• Ensure that jumper SW101 is set to the “I” position
before power-up.
Page 44 of 50 AZI Customer Service 800-528-7411 or 602-470-1414