Density Measurement Problems - Emerson Micro Motion 5700 Configuration And Use Manual

Troubleshooting
June 2019
16.4.2 Inaccurate CM reading
Cause
• Inaccurate density measurement
• Inaccurate temperature measurement
• Incorrect reference conditions
• Incorrect matrix data
• Inappropriate trim values
Recommended actions
1. Verify the line density value.
2. Verify the line temperature value.
3. Ensure that the application is configured to use the appropriate temperature source.
4. Ensure that reference temperature is configured correctly.
5. Ensure that the appropriate matrix is active.
6. Ensure that the matrix is configured correctly.
7. Adjust the extrapolation limits for the active matrix.
8. Adjust measurement with a concentration offset trim.

16.5 Density measurement problems

16.5.1 Erratic density reading
Cause
• Normal process noise
• Two-phase flow
• Line pressure too low
• The flow rate is too high for the installation
• Pipe diameter too small
• Contaminants or suspended solids in the process gas
• Contaminants or suspended solids in the process fluid
• Vibration in the pipeline
• Erosion or corrosion
Recommended actions
1. Check your process conditions against the values reported by the device.
2. Increase the density damping value.
3. Decrease the flow rate.
4. Check for two-phase flow.
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Configuration and Use Manual
Micro Motion 5700 Transmitters with Intrinsically Safe Outputs
MMI-20039472