Check Sensor-To-Transmitter Wiring; Check For Two-Phase Flow (Slug Flow) - Emerson Micro Motion 9739 MVD Configuration And Use Manual

Configuration and Use Manual
MMI-20016855
Recommended actions
No action is required.
10.25.43 Zero Calibration in Progress
Cause
A zero calibration is in progress.
Recommended actions
No action required.

10.26 Check sensor-to-transmitter wiring

A number of power-supply and output problems may occur if the wiring between the sensor and the
transmitter is improperly connected, or if the wiring becomes damaged.
Be sure to check all wiring segments:
• If you have a 4-wire transmitter, check the wiring between the transmitter and the core processor.
• If you have a 9-wire transmitter, check the wiring between the transmitter and the sensor junction box.
• If you have a remote transmitter with remote core processor, check the wiring between the transmitter
and the core processor and the wiring between the core processor and the sensor junction box.
Prerequisites
You will need the installation manual for your transmitter.
Procedure
1. Before opening the wiring compartments, disconnect the power source.
DANGER
If the transmitter is in a hazardous area, wait five minutes after disconnecting the power.
2. Verify that the transmitter is connected to the sensor according to the information provided in the
installation manual.
3. Verify that the wires are making good contact with the terminals.
4. Check the continuity of all wires from the transmitter to the sensor.

10.27 Check for two-phase flow (slug flow)

Two-phase flow can cause rapid changes in the drive gain. This can cause a variety of measurement issues.
Procedure
1. Check for two-phase flow alerts (e.g., A105).
If the transmitter is not generating two-phase flow alerts, verify that two-phase flow limits have been
set. If limits are set, two-phase flow is not the source of your problem.
2. Check the process for cavitation, flashing, or leaks.
Configuration and Use Manual
Troubleshooting
June 2019
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