Juniper HarvestMaster GRAINGAGE H2 STATIONARY, User Manual

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H2 Stationary GrainGage User’s Guide
59 H2 Stationary GrainGage Calibration
12. Average the sample offsets.
For example, if your benchtop sensor says Sample One is +1.2% more than the GrainGage measurement
and Sample Two is +0.8%, the average offset is +1.0%.
13. Add the average adjustment to each moisture point with the exception of the 0 and 1 moisture points
(never adjust 0 or 1). Subtract for a negative average offset. Do not adjust voltages.
In the example above, readings from the benchtop sensor indicate that the samples have, on average, 1%
higher moisture than the percentages in the previously calculated moisture curve.
The following tables illustrate this type of adjustment:
Original Curve Adjusted Curve
Moisture Voltage Moisture Voltage
0.0 0.000 0.0 0.000
1.0 0.400 1.0 0.400
8.0 0.793 9.0 0.793
11.0 0.892 12.0 0.892
14.0 0.990
15.0
0.990
17.0 1.089 18.0 1.089
20.0 1.187
21.0
1.187
36.0 1.713 37.0 1.713
40.0 1.845
41.0
1.845
4.2.6 Manual Calibration Using Excel
HarvestMaster provides a spreadsheet for creating a two-point calibration online. It can be downloaded
at www.harvestmaster.com/data/files/mirus/EM2 Sample Curves 2018.xlsx . Follow the instructions in the
spreadsheet for creating the curve.
Add or subtract
the offsets here.
As needed, add or
remove points in the
curve here.