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Configuration and Use Manual 89
Measurement Performance
Measurement Performance DefaultsTroubleshootingCompensation
10.2.2 Meter validation and meter factors
Meter validation compares a measurement value reported by the transmitter with an external
measurement standard. Meter validation requires one data point.
Note: For meter validation to be useful, the external measurement standard must be more accurate
than the sensor. See the sensor’s product data sheet for its accuracy specification.
If the transmitter’s mass flow, volume flow, or density measurement is significantly different from the
external measurement standard, you may want to adjust the corresponding meter factor. A meter
factor is the value by which the transmitter multiplies the process variable value. The default meter
factors are
1.0, resulting in no difference between the data retrieved from the sensor and the data
reported externally.
Meter factors are typically used for proving the flowmeter against a Weights & Measures standard.
You may need to calculate and adjust meter factors periodically to comply with regulations.
10.2.3 Calibration
The flowmeter measures process variables based on fixed points of reference. Calibration adjusts
those points of reference. Three types of calibration can be performed:
• Zero, or no flow
• Density calibration
• Temperature calibration
Density and temperature calibration require two data points (low and high) and an external
measurement for each. Zero calibration requires one data point. Calibration produces a change in the
offset and/or the slope of the line that represents the relationship between the actual process value and
the reported value.
Note: For density or temperature calibration to be useful, the external measurements must be
accurate.
Result data with EDD Pass/Caution/Abort for current test For all results stored on transmitter:
• Pass/Caution/Abort
• Abort code (if relevant)
• Stiffness of the right and left pickoffs
• Comparison table for stored results
• Comparison plot for stored results
Result data with ProLink II For all results stored on PC:
• Pass/Fail/Abort
• Abort code (if relevant)
• Stiffness of the right and left pickoffs
• Test execution metadata
• Comparison graphs
• Test reports
• Data export and manipulation
capabilities
For all results stored on transmitter:
• Pass/Fail/Abort
• Abort code (if relevant)
• Stiffness of the right and left pickoffs
• Test execution metadata
• Comparison graphs
•Test reports
• Data export and manipulation
capabilities
Startup methods Manual Manual
Scheduler
Event
Table 10-2 Comparison of meter verification features and functions: original version vs. Smart Meter
Verification continued
Feature or function
Meter verification application
Original version Smart Meter Verification