Profile™ is a trademark of Ambrit Ltd
© 2023 Ambrit Ltd
N.B. This feature is only available on the SCADA server or in standalone Profile.
N.B. This feature will only be available if an Approve™ licence has been purchased and is activated on the Station Settings screen.
See the ‘Viewing a Station’ section for more details.
N.B. If Inventory™ or Calibrate™ have been added, the tab will be labelled ‘Equipment’ rather than ‘Meters’.
A new meter setup screen will appear, with the Details tab selected. Meter setup is split into three sections – Details, Base Curve and Settings.
|Meter Run||Select a meter run for the meter. The available meter runs are configured during station setup.|
|Meter Name||This name will be used throughout Profile and Approve to reference the meter.|
|Meter ID||The Meter ID or tag of the meter.|
|Model||The options on the ‘Model’ menu are configured on the Meter Types screen. See the ‘Meter Types’ section for more details.|
|Size||The size of the meter in inches or cm. Remember to include the units e.g. 4” or 12cm.|
|Serial Number||The serial number of the serial number. It is limited to 8 characters and must be unique when combined with the model.|
|Date Installed||This is the date on which the meter is being commissioned. It defaults to the date that the meter is added.|
|Date Last Proved||This will be updated by Approve every time the meter is proved.|
|Base Curve Reference||This field will be used throughout Approve to reference the base curve – yyyy-mm-dd format is recommended for consistency.|
|Base Curve Type||Select “Meter Factor” or “K Factor” base curve.|
|Base Flow Rate||This base flow rate will be used to calculate a normalised meter factor on the Proved Historical Meter Factor chart.|
|Generate Base Curve||To calculate the Base Curve K-Factor and Frequency points from historical accepted prove data, select a curve type from the ‘Generate Base Curve’ popup menu and click the ‘Generate’ button.|
|Base Curve Points||Enter a K Factor and Frequency Hz for each of the points in the base curve. The values entered will be plotted on the chart alongside to illustrate the curve.|
If multiple products will be used with the meter, a base curve should be added for each product.
Click the ‘Multiple Products’ checkbox 4, select a product using the drop-down menu 5 and complete the base curve details as described above. Repeat for each product as required.
Test 1 passes if the current prove is within a given percentage deviation limit of the base curve.
If the meter’s proves do not align with the base curve (because the meter is using the wrong base curve) then you can assign an offset that will shift the base curve into the correct range. This is useful to help to get Test 1 to pass. Otherwise leave the Base curve offset as zero or blank.
Test 2 passes if the meter factor is within the tolerance limits of the control chart.
The meter factors are all normalised to the base flow rate.
The tolerance limits are defined using moving or fixed limits and are calculated using all previous passed proves from the current base curve including the data from the current untested prove.
The Control Chart Limits can set to use either “Moving” or “Fixed Limits”.
When Moving Limits are selected the tolerance limits are automatically calculated. The tolerance limits are based on a 99.5% confidence level of the student distribution table. Test 2 cannot be performed until there have been three successful proves.
If fixed limits are defined, the limit types and the limits need to be manually entered, along with the number of successful proves required for the test to start.
Test 3 passes if the meter factor is within a given percentage of the previous prove. It does not include aborted or struckthrough proves. Test 3 cannot be performed on the first prove. It is typically set as 0.1%. An investigation limit can be set up to raise alarm if required.
Other tests will not mark the prove as a pass or a fail, but will cause the prove to be flagged and brought to the attention of the measurement team in the daily prove status email.
Enter how often the prove must be performed into the ‘Maximum Days Between Proves’ field. A notification will be sent out to the measurement team if the meter has not been proved within this period.
Enter 20 into the maximum days between proves field.
The drift is the deviation limit from the 5th previous prove. A notification will be sent out if a prove exceeds this limit.
Enter 0.0025 into the ‘Drift’ Limit’ field.
Approve runs multi variable regression to predict the meter factor based on historical data for every prove. The variables that are included in the prediction can be defined for each meter. The default options are Flow Rate and Date. The regression can be viewed on the Meter Factor Regression chart and is currently for information purposes only.
Approve requires a given number of passed proves to have been recorded before the prediction can start. The higher the number of proves will increase the accuracy of the first predictions.
|Proves Required for Prediction||The minimum number of proves required for prediction.|
|Regression Limits||The regression limits define limits based on the predicted meter factor.|
|Prediction Variables||The variables that are included in the prediction can be defined for each meter. The default options are Flow Rate and Date. The regression can be viewed on the Meter Factor Regression chart and is currently for information purposes only.|
The meter will be added to the Meters list.