Abstract
The article shows that sampling of grain while controlling the moisture content is carried out in accordance with the current recommendations and standards. The mass of a sample should be sufficient to form 10-15 samples with uniformly distributed moisture values with an interval of no more than 3-4% in the measurement range of a vibration-flow moisture meter. Determination of grain moisture is carried out by the thermogravimetric method using a drying oven as a standard in the following sequence. Measurements with a moisture meter are taken at least three times. For the final measurement result, the average value α of the moisture meter readings from a series of successive measurements is taken. The range in a series of measurements should not exceed 0.05α; otherwise the measurements are repeated. The moisture measurement results and the corresponding readings of the device are entered in the appropriate table. When constructing graduation curves, a correlation-regression analysis of the measurement results is carried out, which is as follows. A correlation field is constructed - a graphical representation of the relationship between the moisture values of the material Wi and the readings of the moisture meter αi. If the analysis is performed correctly, the theoretical regression line plotted on the correlation field should be located as close as possible to the experimental measurement points. The basic error of the vibration-flow moisture meter, obtained as a result of the calculation, should not exceed the permissible value. Otherwise, the graduation of the moisture meter is repeated.
Highlights
The importance of the task to develop a graduation technique for measuring the moisture content of grain is especially great for a number of reasons
The large scope of application and mass scale of grain moisture measurements predetermine the economic significance of the graduation technique for measuring the grain moisture content and the high requirements for it
The graduation table based on the constructed correlation field has been drawn up (Figure 1)
Summary
The importance of the task to develop a graduation technique for measuring the moisture content of grain is especially great for a number of reasons. Moisture is a less definite value than a number of other physicochemical parameters [1,2,3,4]. This is caused by various forms of the state and connection of moisture with the solid phase and its uneven distribution in the grain, as a result of which the so-called average samples (with the imperfection of the existing methods of their selection) insufficiently accurately characterize the moisture content of the entire mass of the material. Most modern moisture meters are graduated not on the basis of exact mathematical relationships, but empirically [5,6,7].
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