Density Measurement Problems - Emerson Micro Motion 2700 Configuration And Use Manual

Troubleshooting
12.4

Density measurement problems

Table 12-4: Density measurement problems and recommended actions
Problem Possible causes
Inaccurate density •
reading •
•
•
•
•
•
•
•
Unusually high densi- •
ty reading •
•
•
•
•
Unusually low density •
reading •
•
222
Problem with process fluid
Incorrect density calibration factors
Wiring problem
Incorrect flowmeter grounding
Slug flow
Plugged or coated flow tube
Incorrect sensor orientation
RTD failure
Physical characteristics of sensor have
changed
Plugged or coated flow tube
Incorrect K2 value
Incorrect temperature measurement
RTD problem
In high frequency meters, this can be an
indication of erosion or corrosion
In low frequency meters this can indi-
cate tube fouling
Slug flow
Incorrect K2 value
In low frequency meters this can indi-
cate erosion or corrosion
Recommended actions
• Check the wiring between the sensor and
transmitter. See
• Check grounding. See
• Check your process conditions against the
values reported by the flowmeter.
• Verify that all of the characterization parame-
ters match the data on the sensor tag.
• Check for slug flow. See
• If two sensors with similar frequency are too
near each other, separate them.
• Purge the flow tubes.
• Verify that all of the characterization parame-
ters match the data on the sensor tag.
• Purge the flow tubes.
• Check for coating in the flow tubes.
• Check your process conditions against the
values reported by the flowmeter.
• Verify that all of the characterization parame-
ters match the data on the sensor tag.
• Check the wiring between the sensor and
transmitter. See
• Check for tube erosion, especially if the proc-
ess fluid is abrasive.
®
Micro Motion Model 2700 Transmitters with Analog Outputs
Section 12.10.
Section 12.11.
Section 12.25.
Section 12.10.