Table 17-6: Temperature measurement problems and recommended actions
(continued)
Problem
Possible causes
Recommended actions
Temperature reading
slightly different from
process temperature
•
Sensor temperature not yet equalized
•
Sensor leaking heat
•
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.
Inaccurate
temperature data
from external 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
temperature input.
•
Ensure that both devices are using the
same measurement unit.
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
Recommended actions
Non-zero velocity
reading at no-flow
conditions or at zero
offset
•
Misaligned piping (especially in new
installations)
•
Open or leaking valve
•
Incorrect sensor zero
•
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.
Configuration and Use Manual
Troubleshooting
MMI-20025166
March 2019
Configuration and Use Manual
305
