Canadian Grain Commission
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Moisture testing – Chapter 2
Official Grain Grading Guide
Determining moisture content for special cases
Optional analysis
An optional analysis is the process of determining the weight and grade of grain which would otherwise be assessed as dockage. If a sufficient quantity of grain is available, a moisture test will be done on all grains assigned a grade as part of the optional analysis.
When the grain assigned a grade as part of the optional analysis is not large enough for official moisture testing, and most of the sample is tough, damp, moist or wet, the optional analysis portion is graded tough, damp, moist, or wet without reference to a specific moisture content.
Corn
See Determination of dockage for corn.
1. Remove foreign material and cracked corn.
| If the moisture content is… | Use this sieve… |
|---|---|
| 25.0% or less | No. 12 round-hole |
| 25.1 % or more | No. 14 round-hole |
2. Choose the appropriate sample size by weight.
| If the moisture content is… | Use a sample size of… |
|---|---|
| under 20.0% | 250 g |
| from 20.0% to 35.0% | 175 g |
3. Choose the conversion table.
| If the moisture content is… | Use conversion table... |
|---|---|
| 20.0% or less | 6 |
| from 20.1% to 35.0% | Moisture Meter Model 919/3.5” 11A - to estimate moisture content based on the dielectric reading and the temperature of the corn 11B - to adjust the preliminary moisture value according to the test weight of the corn sample Moisture Meter 1200A 11B-1200A – to adjust the preliminary moisture value according to the test weight of the corn sample |
