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220 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Diagnostics and Troubleshooting
If slug limits have been configured, and slug flow occurs:
• A slug flow alarm is generated.
• All outputs that are configured to represent flow rate hold their last “pre-slug” value for the
configured slug-flow duration.
If the slug flow condition clears before the slug-flow duration expires:
• Outputs that represent flow rate revert to reporting actual flow.
• The slug flow alarm is deactivated, but remains in the active alarm log until it is
acknowledged.
If the slug flow condition does not clear before the slug-flow duration expires, outputs that represent
flow rate report a flow rate of zero.
If slug time is configured for 0.0 seconds, outputs that represent flow rate will report zero flow as
soon as slug flow is detected.
If slug flow occurs:
• Check process for cavitation, flashing, or leaks.
• Change the sensor orientation.
• Monitor density.
• If desired, enter new slug flow limits (see Section 7.3.2).
• If desired, increase slug duration (see Section 7.3.2).
Output saturation alarms
If an output variable exceeds the upper range limit or goes below the lower range limit, the
Series 3000 device produces an output saturation alarm. The alarm can mean:
• The output variable is outside appropriate limits for the process.
• The unit of flow needs to be changed.
• Sensor flow tubes are not filled with process fluid.
• Sensor flow tubes are plugged.
If an output saturation alarm occurs:
• Bring flow rate within sensor limit.
• Check the measurement unit. You may be able to use a smaller or larger unit.
• Check the sensor:
- Ensure that flow tubes are full.
- Purge flow tubes.
• For the mA outputs, change the 20 mA and 4 mA values (see Section 8.4.4).
• For the frequency output, change frequency and flow values, pulses/unit, or units/pulse (see
Section 8.5).
Batch alarms
If the batch controller is operating, the Series 3000 device produces batch alarms. Table 22-7
summarizes batch alarms and lists corrective actions.