Moisture Calibration
The ValiDator is engineered to provide moisture verification and calibration in
pcf or kg/m³. The nuclear gauge moisture calibration process differs from
density in that the moisture calibration is a straight line and rarely will need to be
re-calibrated. However, the VeriFier software provides the capability for the
moisture calibration of the gauge.
*Density Gauge: A gauge qualified for evaluation should meet the requirements
below:
Gauge base should be free of asphalt or debris that would cause the
unit to rock,
Pass the manufacturers recommended statistical stability and drift
tests, and
Pass a standard count at the evaluation site.
No other nuclear gauges should be within thirty (30) feet.
Make sure proper recommended maintenance steps are taken prior to
calibrating gauges.
**Stable Surface:
Be at least three (3) feet (1M) from any vertical structure.
Dry and level,
Have a density of greater than100pcf (1602 Kg/m3).
Parking lots and construction sites are ideal surfaces for testing.
Unacceptable surfaces would be as follows: trailer floors, truck tailgates, second-
story floors, wet surfaces with standing water or carpeted floors.
Verification Procedures
Gauge Evaluation
The gauge base should be free of dirt and debris, no other nuclear gauges
near-by, 3 ft. (1 m) from any vertical structure, and on a stable surface.
Pass the manufacturers statistical stability test or ASTM and AASHTO
recommendations in D6938, D7759 and/or AASHTO T310.
Complete and pass a four (4) minute standard count in the area where
verification tests are being conducted.
Refer to the gauge operator’s manual for gauge cleaning, routine maintenance
and evaluation procedures.
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