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Meters with Corrected Measurement

This analysis rule includes the measurement elements that have the manual adjustment value set to True in the current case. While a manually corrected measurement does not constitute an error or gross error in itself, it is an unusual occurrence for an automated data acquisition system and therefore needs to be highlighted. To be considered for the analysis, the measurement Element must be in service for the case.

Any corrected measurement appears in the Case log, which you can view in the Log tab of the Case Properties window. The output contains a list of all in-service meters with corrected measurements. In addition, the measurement basis, the difference between the measured and corrected values, and the percent difference between these values (percent based on the measured value) are reported.

The following table lists a sample log output for this analysis.

Sample Log

TimeSeverityElementAttributeMessage
9/25/2005 13:22...REPORTING METER WITH CORRECTED MEASUREMENT - BASIS= MASS
9/25/2005 13:22InformationMeterAManualAdjustmentFlagMeasuredMass: 0 (kg), CorrectedMass:1 (kg), Diff: 1, Diff: 0

Analysis Method​

  1. Collect a list of all measurement elements in the current Case that satisfy the following criteria:
  • Meter Element Attribute representing Manual Adjustment Flag set to True.
  • Status Attribute value is IS (In Service).
  1. For each meter, calculate the difference between the measured and corrected quantities.
  2. Write to the log section of the case. Report the test name, the measurement basis, the difference between the measured and corrected values and the percent difference between these values (percent based on the measured value).

Configuration Using the Wizard​

The configuration of the Meters with Corrected Measurement is a selection of the General Gross Error Analysis Rule. You open the window for configuring the test (shown in the following figure) from the General Gross Error Analysis Rule Wizard.

  1. Open the Gross Error Configuration window as described in Configuring - General Gross Error Analysis Rule.

  2. On the Liquid/Gas Meters tab, select Meters with corrected measurement.

    A Meters with corrected measurement - Attributes window opens.Figure 389: Meters with corrected measurement - Attributes window

  3. Select the measurement basis and the Attributes according to the following table:

    Attributes

    SelectionsDescription
    Measurement BasisSelect mass or volume measurement basis for comparison.
    MeasuredMeter actual measurement. This defaults to 'MeasuredMass' or 'MeasuredVolume' depending on mass or volume selection.
    CorrectedMeter corrected measurement. This defaults to 'CorrectedMass' or 'CorrectedVolume' depending on mass or volume selection.
    Manual FlagFlag to indicate if a corrected measurement was used for the meter. This defaults to 'ManualAdjustmentFlag',
    StatusMeter in/out of service status. This defaults to 'ObjectStatus'.

  4. Click OK to finish the configuration.

    The text "CONFIGURED" displays next to the 'Meters with corrected measurement' selection.

  5. To run this test, see Running the General Gross Error Analysis.