Wet Density and % Moisture Offsets can be either negative or positive. To enter a positive offset simply type
in the offset value that will be added to the current measurement. To enter a negative offset, use the (-/+) key to
enter a negative sign then enter the value that will be subtracted from the measured value. After the offsets are
applied to the Wet Density and % Moisture, Dry Density and Volumetric Moisture are calculated by the SDG
200 as follows:
The % Moisture Offset is input as a percentage. For example, if the SDG 200 is consistently measuring %
moisture as 7.5% and a collocated reference measurement is consistently measuring 5%, inputting an offset of
-2.5 will adjust the SDG 200 to yield results similar to your reference measurement.
The Wet Density offset is input in units of mass/unit volume. If the gauge is set to operate in kg/m³, the offset
will need to be entered in kg/m³. If the SDG 200 is configured to operate in lb/ft³, the density offset will need
to be entered in lb/ft³.
The moisture, density, and compaction values displayed by the SDG 200
and logged in the .mnt file reflect the application of the user selected offsets
Failing to enter the Wet Density Offset in the same units that the
SDG 200 is Configured to measure in may result in significant errors.
Setting Measurement Offsets
Offsets for Wet Density and % Moisture can be set manually by the operator in cases where the SDG 200
does not appear to be comparing favorably to collocated measurements. The offsets are simply added to
or subtracted from the Wet Density and % Moisture calculated by the SDG 200. Dry Density, Volumetric
Moisture, and % Compaction are then recalculated based on the offset values of Wet Density and % Moisture.
The Wet Density and % Moisture offsets are saved in each data record
with the results of the corresponding test in the .mnt file.
Wet Density and % Moisture offsets are entered into the SDG 200 as a material property and are displayed and
edited identically to other material properties.
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