SPECIAL CALIBRATIONS
Troxler gauges are calibrated to “average soil.” Average soil is
defined as material consisting of 50% limestone (calcareous) and
50% granite (siliceous). This factory calibration provides accurate
results for the majority of materials encountered in the field.
However, there are situations when varying material compositions
could affect the gauge accuracy. In these special cases the gauge B
value can be recalculated either by the gauge or by considering the
mass attenuation (µ/ρ) of the material.
If the chemical composition of the soil is known, Troxler can
provide a procedure for recalculating the B value for manual entry
(see page 3–9) to accurately measure the soil density. This
calculation requires in-depth knowledge of the gauge geometry and
the detected energy spectrum of the Cs-137 source.
The Special Calibration function allows the gauge to be recalibrated
for material densities and compositions other than those covered by
the factory calibration.
The true density of a sample of the material must be obtained prior
to calculating a special calibration. This density may be obtained
from a laboratory sample.
To access the Special functions, press 〈SPECIAL〉.
To access the Special Calibration function, press the down arrow
four times. Press 〈START/ENTER〉 to display:
SPECIAL CALIB.
Want to Recalib?
3–8
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