Gas Measurement Problems; Concentration Measurement Problems - Emerson Micro Motion SGM Series Configuration And Use Manual

A thermal insulation jacket should protect both the sensor body and the flanges.
A thermal insulation jacket designed specifically for your meter is available from
Micro Motion. See the product data sheet for your meter.
14.9

Gas measurement problems

Table 14-5: Gas measurement problems and recommended actions
Problem Possible causes
Compressibility or •
other gas process var-
iable reads NaN (Not a •
Number) •
Inaccurate gas read- •
ings
•
Related information
14.10

Concentration measurement problems

Table 14-6: Concentration measurement problems and recommended actions
Problem Possible causes
Inaccurate concentra- •
tion measurement •
reading •
Configuration and Use Manual
Process variable outside valid range for
compressibility method
Input to gas measurement not operational
Inaccurate density reading due to leakage
Inaccurate density, temperature, pressure,
or other inputs
Inappropriate calibration factors
Compressibility Method and process limits
Inaccurate density measurement
Incorrect matrix data
Inappropriate trim values
Recommended actions
• Ensure that your process is within the valid
range for the configured compressibility
method.
• Ensure that all inputs are configured cor-
rectly.
• Ensure that all inputs are operating cor-
rectly.
• Check for leakage.
• Ensure that the process data used for gas
measurement is accurate. This includes
density, temperature, pressure, gas com-
position.
• Ensure that the correct calibration is being
used for measurement.
• Recalibrate the device.
Recommended actions
• Verify the molecular weight, specific gravi-
ty, or relative density value. If it is not accu-
rate, resolve your measurement problems.
• Ensure that the appropriate matrix is ac-
tive.
• Ensure that the matrix is configured cor-
rectly.
• Adjust the concentration value by applying
an offset. See Section 13.5.
Troubleshooting
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