4. System Operation
Calibration Accuracy Verification & Calibration Process
Verification Process
Verification of the gauge is necessary to determine the status of the gauge
calibration. Gauges are calibrated when they are shipped from the manufacturer.
Without performing periodic verification, it is not possible to assess the accuracy of
your gauge calibration. ASTM and AASHTO standards require gauges to be verified
for calibration accuracy at least once every 12 months and also the calibration is
checked on newly acquired or repaired nuclear gauges. With the ValiDator,
gauges may be verified to meet this requirement.
Verification
Definition: Use the reference densities assigned to a ValiDator device for
evaluating the calibration accuracy of a density gauge.
Resources: ValiDator Device, Gauge Field Evaluation Form, ValiDator Calibration
Tables, *Density Gauge, **Stable surface.
Important: Follow the requirements of your nuclear materials license when
operating, maintaining and using your gauge.
Calibration
Calibration is a process of calculating new parameters for the nuclear gauge.
Only advanced users with a high degree of experience and understanding of
gauge measurement and operations should perform this process. It is
recommended that one individual in an organization be responsible for the
calibration process. The Verifier Software with counts taken on the ValiDator can be
used to generate new moisture and density calibration constants for the gauge.
Resources: InstroTek VeriFier Software, PC, Completed Evaluation Form, *Density
Gauge, Gauge Calibration Constants, **Stable surface
Note: The VeriFier Software used for calibrating your gauge assumes that the
current gauge calibration information is obtained and entered
accurately.
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