Moisture testing – Chapter 2
Official Grain Grading Guide

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Estimating the moisture content of high moisture samples

If the moisture meter dial reading on a sample is higher than those on the moisture conversion table, use the following procedure to estimate moisture content.

1. Accurately, to two decimal places, weigh a sample larger than the quantity required for testing according to the appropriate sample weight on Estimating moisture content for lightweight wheat, oats and barley samples.
   For example, for CWRS, use 300 g, not 250 g.
2. Spread the sample on paper and let it dry at room temperature until a reading can be obtained.
3. Reweigh the sample.
4. Calculate the percentage weight loss.
   A = original sample weight
   B = sample weight after air drying
   C = percentage loss in weight during drying
   (A-B)/A x 100 = C
5. Mix the sample thoroughly.
6. Weigh out the amount required for a meter test.
7. Determine the temperature of the sample.
8. Follow the procedures on Moisture specifications to determine the moisture content. (=D)
9. Determine the total moisture content of the sample using the following formula.
   C = percentage by weight of moisture loss on air drying (step 4)
   D = Moisture content determined by meter (step 8)
   Percentage moisture by weight = [(100 - C) x D/100] + C
10. Report the result to the nearest 0.1 %.

Note: to improve the accuracy of the moisture test, the sample should be returned to a plastic bag an be allowed to equilibrate for several hours after pre-drying.

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