Tip
The default HART address is 0. This is the recommended value unless the device is in a
multidrop network.
2. If the primary mA output is producing a fixed value of 4 mA, ensure that mA Output
Action (Loop Current Mode) is enabled.
For all HART addresses except 0, mA Output Action must be enabled to allow the
primary mA output to report process data.
3. Refer to the wiring diagrams in the installation manual and verify that the primary
mA output is correctly wired for HART support.
4. Ensure that the output is powered.
5. Check for electrical problems at the transmitter terminals.
a. Disconnect the primary mA output wires from the transmitter's MAO1 terminals.
b. Wire and power the MAO1 terminals as shown in the following figure.
Wiring and power to test terminalsFigure 10-1:
A. Voltmeter
B. 250–600 Ω resistance
C. External power supply
D. Transmitter with end‐cap removed
c. Using a voltmeter, check the voltage drop across the resistor.
For a 250 Ω resistor, 4–20 mA = 1–5 VDC. If the voltage drop is less than 1 VDC,
add resistance to achieve a voltage drop within the required range.
d. Connect a Field Communicator directly across the resistor and attempt to
communicate (poll).
If this test fails, the transmitter may need service. Contact Micro Motion.
Related information
Configure basic HART parameters
Using the Field Communicator with the transmitter
Troubleshooting
154 Micro Motion
®
Fork Density Meters (FDM)
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