Configuration and Use Manual 183
Measurement Performance
Diagnostics and Troubleshooting Specifications – Model 3350/3700Specifications – Model 3300/3500Measurement Performance
• Measurement adjustment
- Meter verification is an indicator of sensor condition, but does not change flowmeter
internal measurement in any way.
- Meter validation does not change flowmeter internal measurement in any way. If you
decide to adjust a meter factor as a result of a meter validation procedure, only the reported
measurement is changed – the base measurement is not changed. You can always reverse
the change by returning the meter factor to its previous value.
- Calibration changes the transmitter’s interpretation of process data, and accordingly
changes the base measurement. If you perform a zero calibration, you can restore the
factory zero at a later time. You cannot return to the previous zero (if different from the
factory zero), density calibration values, or temperature calibration values unless you have
manually recorded them.
Micro Motion recommends obtaining the meter verification option and performing meter verification
on a regular basis.
21.3 Performing meter verification
Note: To use meter verification, the transmitter must be paired with an enhanced core processor, and
the meter verification option must be purchased for the transmitter.
21.3.1 Preparing for the meter verification test
Process fluid and process conditions
The meter verification test can be performed on any process fluid. It is not necessary to match factory
conditions.
During the test, process conditions must be stable. To maximize stability:
• Maintain a constant temperature and pressure.
• Avoid changes to fluid composition (e.g., two-phase flow, settling, etc.).
• Maintain a constant flow. For higher test certainty, reduce or stop flow.
If stability varies outside test limits, the meter verification procedure will be aborted. Verify the
stability of the process and retry the test.
Transmitter configuration
Meter verification is not affected by any parameters configured for flow, density, or temperature. It is
not necessary to change the transmitter configuration.
Control loops and process measurement
If the transmitter outputs will be set to Last Measured Value or Fault during the test, the outputs will
be fixed for two minutes (Smart Meter Verification) or three minutes (original version). Disable all
control loops for the duration of the test, and ensure that any data reported during this period is
handled appropriately.
