Emerson Micro Motion 1600 - 16.25 Check power supply wiring; 16.26 Check for radio frequency interference (RFI)

Table 16-5: Possible causes and recommended actions for low pickoff voltage (continued)
Possible cause Recommended actions
Sensor tubes are not vibrating • Check for plugging or deposition.
• Ensure that the vibrating element is free to vibrate (no
mechanical binding).
• Verify wiring.
Moisture in the sensor electronics Eliminate the moisture in the sensor electronics.
The sensor is damaged Replace the sensor.
Two-phase flow Ensure the sensor tubes are full.
16.25 Check power supply wiring
If the power supply wiring is damaged or improperly connected, the transmitter may not receive enough
power to operate properly.
Prerequisites
• You will need the installation manual for your transmitter.
Procedure
1. Use a voltmeter to test the voltage at the transmitter power supply terminals.
• If the voltage is within the specified range, you do not have a power supply problem.
• If the voltage is low, ensure that the power supply is adequate at the source, the power cable is
sized correctly, there is no damage to the power cable, and an appropriate fuse is installed.
• If there is no power, continue with this procedure.
2. WARNING
If the transmitter is in a hazardous area, wait five minutes after disconnecting the power. Failure to
do so could result in an explosion causing death or injury.
Before inspecting the power supply wiring, disconnect the power source.
3. Ensure that the terminals, wires, and wiring compartment are clean and dry.
4. Ensure that the power supply wires are connected to the correct terminals.
5. Ensure that the power supply wires are making good contact, and are not clamped to the wire
insulation.
6.
WARNING
If the transmitter is in a hazardous area, do not reapply power to the transmitter with the housing
cover removed. Reapplying power to the transmitter while the housing cover is removed could cause
an explosion.
Reapply power to the transmitter.
7. Test the voltage at the terminals.
If there is no power, contact customer service.
16.26 Check for radio frequency interference (RFI)
The transmitter Frequency Output or Discrete Output can be affected by radio frequency interference (RFI).
Possible sources of RFI include a source of radio emissions, or a large transformer, pump, or motor that can
Troubleshooting Configuration and Use Manual
May2024 MS-00809-0200-1600
214 Emerson.com