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Emerson Model 1700 Manual De Usuario

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10.4
Density measurement problems
Density measurement problems and recommended actions
Table 10-4:   
Problem
Possible causes
Recommended actions
Inaccurate density
reading
•
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
•
Check the wiring between the sensor and
transmitter. 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.
Unusually high densi-
ty reading
•
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
•
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.
Unusually low density
reading
•
Slug flow
•
Incorrect K2 value
•
In low frequency meters this can indi-
cate erosion or corrosion
•
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.
Troubleshooting
188
 Micro Motion
®
 Model 1700 Transmitters with Analog Outputs