Emerson MICRO MOTION 1500, Руководство по конфигурации и использованию, Страница: 111 / 282

Configuration and Use Manual 101
Measurement Performance
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Micro Motion recommends obtaining the meter verification transmitter option and performing meter
verification on a regular basis.
10.3 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.
10.3.1 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 test will be aborted. Verify the stability of the process and
repeat 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.
Specification uncertainty limit
The specification uncertainty limit defines the acceptable degree of variation from factory results,
expressed as a percentage. Variation inside the limit is reported as Pass. Variation outside the limit is
reported as Fail or Caution.
• In Smart Meter Verification, the specification uncertainty limit is set at the factory and cannot
be configured.
• In the original version of meter verification, the specification uncertainty limit is configurable.
However, Micro Motion suggests using the default value. Contact Micro Motion Customer
Service before changing the specification uncertainty limit.
10.3.2 Running the meter verification test, original version
To run a meter verification test:
• With ProLink II, see Figure 10-1.
• With the display, see Figure 10-2.
• With the 375 Field Communicator, see Figure 10-3.