The correction scheme of temperature errors in the moisture meter transformer with cylindrical electrodes

The aim of carried out investigations is the analysis of a different correction errors circuit of temperature in the moisture transformer with a cylindrical electrode in point of view increasing the measurements accuracy of grain and grain products moisture. The measurement accuracy in the moisture transformer depends on the constructive technological features, effective working possibilities and static characteristics linearity degree of its consisting elements. At the same time, an additive logo metric circuit, which can also be used in other capacitive transformers, has been considered. Using experimental method the dependence of the reactive resistance of cylindrical transformer on the capacity of cylindrical transformer in process of working with bulk materials has been obtained. We showed that when one is working with bulk materials the reactive resistance is decreased down sharply and at the same time the cylindrical transformer capacity value reaches the value 2 pF. Further, the reactive resistance is decreasing slowly on the capacity that demonstrates the change of the transformer sensitivity too. The functional dependence of capacity moisture transformer with cylindrical electrode sensitivity on the reactive resistance has been studied. Novelty of the carried out investigations in that we revealed the concrete value of moisture transformer capacity in which the sensitivity of the measuring device will be the highest value. It has been revealed that when the reactive resistance of the cylindrical transformer is growing then its sensitivity is decreasing. The maximal cylindrical transformer sensitivity reaches when the reactive resistance equals to 0.5⋅10 4 Оhm which corresponds to maximal change of the moisture transformer capacity when we working with bulk materials. It has been shown that the additive-logo metric circuit can be used for increasing accuracy of the grain and grain products moisture on the common reactive resistance 0.5⋅10 4 Оhm which allows reach the measuring device maximal sensitivity. All these conclusions we must take into account on projecting the basic elements of the transformer with cylindrical electrode for grain and grain products moisture.

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