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Purpose
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m by your MetaField Administrator for it to be available for a Density Test. A new gauge requires 5 standardization counts to be entered.
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MetaField requires that a gauge be standardized each day per ASTM requirements. MetaField enforces this by only allowing gauges standardized that day (calendar day, not rolling 24 hour period) to be used for field density tests. The standardization date of a gauge must match the test date of a test in order for the gauge to be available for selection. |
A nuclear density gauge must be entered in the syste
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Gauges are required to be calibrated / verified by ASTM standard annually, or whenever the gauge is determined to need repair. We recommend that when these events occur, the field technician run the MetaField standardization 5 times using the resulting counts to reset the gauge to the calibrated / verified count. Ongoing daily standardization then uses the calibrated / verified count as the new benchmark. |
How to Standardize a Nuclear Gauge
To standardize a nuclear gauge, select the Gauge Standardization button from the MetaField Field menu. The following menu will appear. Select the name of the gauge you wish to standardize and click the Standardize Gauge button.
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Depending on the gauge selected, MetaField will automatically adjust according to the Method the gauge was calibrated (Standard Count or Radioactive Decay) |
Standard Count
The following will appear after you select a gauge that has been calibrated via Standard Count method.
- Supply the Density and Moisture values from your gauge
- Click the Perform Test button
- Review the standardization results
- Save the standardization results if valid or re-enter the standardization data if data was entered in error
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| Standardization Date will not default to a date. Pay careful attention when entering this date. That date you enter must be >= the last standardization date you entered, so it is important you enter your standardization data in the order they were done. It is recommended that firms make it a practice of entering their standardization data as soon as possible (ideally on the job site after you run the standardization) and no later than the day the gauge was standardized. |
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The standardization is based on the the previous four (4) standardization counts along with the current values for that day. To determine if the moisture count passes, the absolute value of the following is evaluated: (New Moisture - Average Moisture) / Average Moisture <= gauge's Rx Moisture Limit / 100 To determine if the density (1 and 2) count passes, the absolute value of the following is evaluated: (New Density - Average Density) / Average Density) <= gauge's Rx Density Limit / 100 |
Standard Count (Troxler 3450 Gauges)
The following screen will appear if a gauge is calibrated to record 2 density readings. This is mainly used to support Troxler 3450 gauges.
- Supply the both Density values and Moisture value from your gauge
- Click the Perform Test button
- Review the standardization results
- Save the standardization results if valid or re-enter the standardization data if data was entered in error
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“Accurate” does not mean the result is “True.” It means that the field technician has validated that the counts entered are correct. There are times when the gauge standardization may fail, but the gauge does not need maintenance. You should follow your company’s procedure for dealing with these exception situations. |
Radioactive Decay
The following screen will appear after you select a gauge that has been calibrated via Radioactive Decay method.
- Supply the Standardization Date
- Supply the Density and Moisture Standard Counts Measured from the gauge
- Click thePerform Testbutton
- Review the standardization results
- Save the standardization results of valid or re-enter if data entered produced a standardization fail.
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Post-Save Options
Once your counts are saved, Gauge Standardization is complete. At this point, you will be given 3 options:
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Enter Another Count | Select this option when the gauge standardization failed, but there is an exception to be considered (e.g. humidity). |
Standardize Another Gauge | Select this option to enter standardization counts for a different gauge. |
Perform A Soil Density Test | Select this option to visit the project selection screen and begin the Soil Density Testing process. |
The Add proctor screen in Field is a form that allows field users to add basic proctor information “on-the-fly” for a selected project. Saving proctor results here will add the proctor to the LIMS proctor results table and allow any user to select that proctor on density tests being performed against the same project. This feature will come in handy if you perform Field Tests outside of MetaField to determine Max Density and Optimum Moisture prior to performing a density test. Another use case of this functionality would be if proctor results are given to the Field Tech on-site because a “pre-tested” material is being used.
Adding Proctor Results
Proctor results can be added in the Field module for users that have the necessary permissions. If you do not have the rights to add proctors in the Field module, you may need to contact your system administrator to update your permissions. Select Soil Proctor Results from the Field main menu,