Emerson Process Management MICRO MOTION 2400S - Manual (Page 104)

96 Micro Motion ® Model 2400S Transmitters for DeviceNet ™
Measurement Performance
10.3.1 Uncertainty limit and test results
The result of the meter verification test will be a percent uncertainty of normalized tube stiffness. The
default limit for this uncertainty is ±4.0%. This limit is stored in the transmitter, and can be changed
with ProLink II or a DeviceNet tool when optional test parameters are entered. For most installations,
it is advisable to leave the uncertainty limit at the default value.
When the test is completed, the result will be reported as Pass, Fail/Caution (depending on the tool
you are using), or Abort:
• Pass – The test result is within the specified uncertainty limit. If transmitter zero and
configuration match factory values, the sensor will meet factory specifications for flow and
density measurement. It is expected that the meter will pass meter verification every time the
test is run.
• Fail/Caution – The test result is not within the specified uncertainty limit. Micro Motion
recommends that you immediately re-run the meter verification test. If the meter passes the
second test, the first Fail/Caution result can be ignored. If the meter fails the second test, the
flow tubes may be damaged. Use the knowledge of your process to consider the type of
damage and determine the appropriate action. These actions might include removing the meter
from service and physically inspecting the tubes. At minimum, you should perform a flow
validation (see Section 10.4) and a density calibration (see Section 10.6).
• Abort – A problem occurred with the meter verification test (e.g., process instability). Check
your process and retry the test.
ProLink II provides more detailed test data. See Section 10.3.2.