Density measurement problems and recommended actions (continued)Table 10-2:
Problem Possible causes Recommended actions
Cyclic inaccuracy in
density reading
• Stirrer rotation rate too high
• Tank flow rate too high
• Fork in poor location
• Stirrer creating bubbles
• Solids in tank
• Reduce the stirrer rotation rate.
• Reduce the tank flow rate.
• Move the fork to a location with a lower
flow profile.
• Install a sample bypass.
• Replace the device with a CDM.
Density reading from
device does not
match laboratory val-
ue
• Incorrect calibration factors
• Laboratory conditions do not match sam-
ple conditions
• Verify the calibration factors.
• Verify or adjust the density offset and/or
the density meter factor.
• Ensure that the two fluids are being com-
pared at the same temperature.
10.8 Temperature measurement problems
Temperature measurement problems and recommended actionsTable 10-3:
Problem Possible causes Recommended actions
Temperature reading
significantly different
from process temper-
ature
• RTD failure
• Incorrect compensation factors
• Line temperature in bypass does not
match temperature in main line
• Verify that the temperature compensation
factors match the value on the sensor tag
or calibration sheet.
• If Alert A004, A016, or A017 is active, per-
form the actions recommended for that
alert.
Temperature reading
slightly different from
process temperature
• Sensor temperature not yet equalized
• Sensor leaking heat
• If the error is within the temperature speci-
fication for the sensor, there is no prob-
lem. If the temperature measurement is
outside the specification, contact
Micro Motion.
• The temperature of the fluid may be
changing rapidly. Allow sufficient time for
the sensor to equalize with the process flu-
id.
• Install thermal installation, up to but not
over, the transmitter housing.
• The electrical connection between the RTD
and the sensor may be damaged. This may
require replacing the sensor.
Troubleshooting
Configuration and Use Manual 147
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