Velocity Measurement Problems - Emerson Micro Motion 5700 Configuration And Use Manual

Configuration and Use Manual
MMI-20025166
Table 17-6: Temperature measurement problems and recommended actions
Problem Possible causes
Temperature reading •
slightly different from
•
process temperature
Inaccurate •
temperature data
•
from external device
•

17.40 Velocity measurement problems

Important
If you are measuring gas, minor inaccuracy in velocity readings is expected. If this is an issue for your
application, contact customer support.
Table 17-7: Velocity measurement problems and recommended actions
Problem Possible causes
Non-zero velocity •
reading at no-flow
conditions or at zero
•
offset
•
Configuration and Use Manual
Sensor temperature not yet equalized
Sensor leaking heat
Wiring problem
Problem with input configuration
Problem with external device
Misaligned piping (especially in new
installations)
Open or leaking valve
Incorrect sensor zero
(continued)
Recommended actions
• If the error is within the temperature
specification for the sensor, there is no
problem. If the temperature measurement
is outside the specification, contact
customer service.
• The temperature of the fluid may be
changing rapidly. Allow sufficient time for
the sensor to equalize with the process
fluid.
• Install thermal installation, up to but not
over, the transmitter housing.
• Check the sensor coils for electrical shorts.
If you find problems, replace the sensor.
• The RTD may not be making good contact
with the sensor. The sensor may need to be
replaced.
• Verify the wiring between the transmitter
and the external device.
• Verify that the external device is operating
correctly.
• Verify the configuration of the
temperature input.
• Ensure that both devices are using the
same measurement unit.
Recommended actions
• Zero the meter.
• Check for open or leaking valves or seals.
• Check for mounting stress on the sensor
(for example, the sensor being used to
support piping, misaligned piping).
• Contact customer service.
Troubleshooting
March 2019
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