14.8 Temperature measurement problems
Temperature measurement problems and recommended actionsTable 14-4:
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.
• Perform a temperature calibration.
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.
• If Alert A004, A016, or A017 is active, per-
form the actions recommended for that
alert.
• The electrical connection between the RTD
and the sensor may be damaged. This may
require replacing the sensor.
Inaccurate tempera-
ture data from exter-
nal device
• Wiring problem
• Problem with input configuration
• Problem with external device
• Verify the wiring between the transmitter
and the external device.
• Verify that the external device is operating
correctly.
• Verify the configuration of the tempera-
ture input.
• Ensure that both devices are using the
same measurement unit.
Related information
Thermal insulation
14.8.1
Thermal insulation
Temperature measurement is a potential source of significant error in density
measurement. Thermal insulation helps to maintain a constant temperature, and can
reduce or eliminate temperature problems.
Thermal insulation is especially important when the line temperature and the ambient
temperature are significantly different, or when there are abrupt changes in either the line
temperature or the ambient temperature.
Troubleshooting
158 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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