How To Make Your Own Grain Calibration - Supertech Agroline Farmpoint Notice D'utilisation

Note: Due to different sized kernels one can expect slight deviations in the measurements since each
sample will not be packed the same. As compensation one is recommended to take 3-5 measurements
from the same batch of grain and use the average as a marker for the true moisture content in the grain.
Remember to empty and refill the test cell in between each test.
Note: High moisture grain will continue to compress in the test cell once the pressure lid is screwed
down. High readings will be the result if the test button is not pressed immediately after screwing on the
lid.
Note: Some grains, such as grass seeds are too small to push up the pressure indicator screw to
become flush with the top of the lid. In this case, screw the lid down all the way and take a reading. Do
not attempt to add additional grain to the test cell.

How to make your own grain calibration.

If you need to make a calibration scale for a particular crop that is not included in the meter, this can be
done as follows:
1. Turn on the meter by pressing ON/TEST.
2. When MEASURE appears press ON/TEST again.
3. Use the arrow keys ⇑ or ⇓ scroll through the crop options until Bit is displayed.
4. Fill the test cell with a sample of the desired crop for which you know the moisture content and
perform the test as described earlier.
5. Note down the value which appears in the display, eg. 03.65, and the temperature, eg. 19C, together
with the moisture content in the crop. Perform this process repeatedly using samples with different
levels of known moisture content until the calibration scale meets the range and requirements
needed. The more samples that are used the more accurate the calibration will be. Try always to use
samples at the same temperature.
6. Plot the values on a graph, either manually or using Excel, with moisture content on the y-axis and
Bit on the x-axis and draw a line or curve that best fits the points. The calibration is now completed
and moisture contents can now be read off the y-axis for any Bit value measured using subsequent
samples of the same crop in the meter.
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