Problem Possible causes Recommended actions
Inaccurate referred
density reading
• Inaccurate density measurement
• Inaccurate temperature measurement
• Inaccurate pressure value
• Incorrect reference conditions
• Incorrect API table selection
• Verify the line density value. If it is not ac-
curate, see Section 10.7.
• Verify the line temperature value. If it is
not accurate, see Section 10.8.
• Ensure that the application is configured to
use the appropriate temperature source.
• Ensure that the pressure source is config-
ured correctly, that the external pressure
device is operating correctly, and that both
devices are using the same measurement
units.
• Ensure that reference temperature and ref-
erence pressure, if applicable, are config-
ured correctly.
• Ensure that the selected API table is appro-
priate for the process fluid.
10.10 Concentration measurement problems
Problem Possible causes Recommended actions
Significantly incorrect
concentration meas-
urement after loading
matrix
• The wrong temperature or density unit
was configured when the matrix was loa-
ded
• Set the temperature and density units to
the units used when the matrix was built,
then reload the matrix. For custom matri-
ces, contact Micro Motion.
Inaccurate concentra-
tion measurement
reading
• Inaccurate density measurement
• Inaccurate temperature measurement
• Incorrect reference conditions
• Incorrect matrix data
• Inappropriate trim values
• Verify the line density value. If it is not ac-
curate, see Section 10.7.
• Verify the line temperature value. If it is
not accurate, see Section 10.8.
• Ensure that the application is configured to
use the appropriate temperature source.
• Ensure that reference temperature is con-
figured correctly.
• Ensure that the appropriate matrix is ac-
tive.
• Ensure that the matrix is configured cor-
rectly.
• Ensure that the matrix curve fit is good.
• Adjust the extrapolation limits for the ac-
tive matrix.
• Adjust measurement with a concentration
offset trim. See Section 9.5.
Troubleshooting
152 Micro Motion
®
Compact Density Meters (CDM)
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