Troxler EGauge 4590, Manual Of Operation And Instruction

Page: 84 / 186

5–16
To Perform a Moisture Probe Calibration
To calibrate the probe to a specific soil in the field- create a
soil specific Cal Profile. Carefully read and follow the steps
below and use the worksheet in Appendix F for Moisture Cal
Profile development to ensure that all the data needed is
obtained.
1. Choose 3 to 25 sites to perform probe measurements
and collect a sample to analyze in the lab (to determine
true %M). More sites will create a better calibration, at
least 5 sites are recommended. It is recommended the
moisture content of these selected sites vary by 5% to
achieve the best calibration curve.
2. At each site, perform the density reading and the
moisture probe reading. As this is done, write down the
WD and Diff values for each site (see worksheet on page.
F-5 in back of manual). If you want the gauge to store
these values as a partial calibration, choose “Gauge
Derived” as the “Method of Data Entry”
before
performing the measurements.
3. Determine the True % moisture of the samples using
your preferred method. Typically, this is done in a lab
(oven dry) or onsite using a cook stove or Speedy
moisture tester. These values will be entered during
keypad entry of the data points or as the last step of the
probe calibration if using the gauge derived method.
Follow these keypresses to perform the material specific probe
calibration as described above:
Select 3. Probe Calibration, under the Moisture Probe menu, to
begin the new calibration for a specific soil.
Next determine if you want to 1. Create a new calibration or 2.
Enter calculated constants (use option 2 if you have derived
your own constants outside of the gauge software).
Probe Calibration
1. Create New Cal
2. Enter Constants