GENERAL OPERATION
7
Sensor Calibration
MAIN MENU
→
SENSOR CALIBRATION
The Sensor Calibration Screen is used to calibrate the discharge moisture sensor to an offline
moisture tester. Calibration settings for the discharge sensor are set from factory, however changes
in types of grains, test weight or grain quality may require the user to do a field calibration.
When taking a hand sample from the sample hole of the Discharge Sensor By-Pass Chute press the
YELLOW sample button located near the point of discharge. This captures the value the sensor is
reading as close as possible to the same time the hand sample is drawn. When the hand sample is
tested with an offline moisture tester, return to the console and input the value of the tested
sample in the ACTUAL MOISTURE field highlighted by the green box. After 6 consecutive samples
over a period of time, the CALIBRATE button will appear and the operator will have two options to
calibrate.
If the error in moisture reading from the console and an offline moisture tester is consistent across
a range of moisture then doing a SIMPLE CALIBRATION may be all that is required.
If the error in moisture reading from the console and an offline moisture tester seem to have no
correlation then an ADVANCED CALIBRATION is recommended.
Either calibration will show the new calculated slope and offset for the moisture equation when
selected. However an additional R
2
factor is shown for the advanced calculation. This value is based
on a scale of 0-1.00 and represents how well the moisture samples that were taken fit the curve it
calculates. R
2
values that are < .50 are considered to be unsuccessful calibrations and the values
shouldn
’
t be accepted. Values > .50 are considered to be successful calibrations and those values
can be used. The closer the R
2
values are to 1.00, the better the calibration will be.
All moisture calibration tests should be bracketed around the range of desired discharge moisture.
In other words if the operator were drying corn and wanted an average moisture discharge of 15%
an acceptable moisture calibration test bracket would be 13-14% on the low end and 16-17% on
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