Abstract When we speak about capacitance moisture meters for bulk materials we have to face with different values of dielectric permittivity for different bulk materials in dehydrated state, what causes a method error that can be named ‘type uncertainty’. Besides, different varieties of the same material have different values of dielectric permittivity, which depend from geographical origin, processing conditions etc. It can be hardly predicted automatically and type uncertainty can be compensated only in separate situations with the help of preliminary calibration. Main tasks of the research are to develop new comparison principle of moisture measurement with better accuracy due to effective compensation of physical, chemical and granulometric composition influence on the result of moisture measurement, develop new primary and secondary instrument transducers. Moisture sensor consists of four measuring capacitors. Two of them should be filled with a sample, which moisture content should be determined, and other pair of measuring capacitors should be filled with a same substance, but previously dehydrated. Mathematical models, developed to take into account granulometric composition of a bulk material were used to carry out a comparison analysis for three types of instrument measuring transducers. Obtained results proved that suggested principle of moisture measurement provides effective compensation of granulometric composition influence. Developed measuring principle had been experimentally tested what helped to confirm that it provides two times better compensation of different physical and chemical composition for different materials in comparison with the direct comparison method.

中文翻译：

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一种使用电容式传感器测量散装物料水分的有效方法

摘要 当我们谈到散装材料的电容式水分计时，我们不得不面对脱水状态下不同散装材料的不同介电常数值，这会导致方法错误，称为“类型不确定性”。此外，同种材料的不同品种介电常数值不同，这取决于地理来源、加工条件等。很难自动预测，类型不确定度只能在不同情况下借助初步校准来补偿。研究的主要任务是通过有效补偿物理、化学和粒度组成对水分测量结果的影响，开发出精度更高的水分测量新比较原理，开发新的初级和次级仪器传感器。水分传感器由四个测量电容器组成。其中两个应填充样品，应确定其水分含量，另一对测量电容器应填充相同的物质，但预先脱水。为考虑散装材料的粒度组成而开发的数学模型用于对三种类型的仪器测量传感器进行比较分析。获得的结果证明，建议的水分测量原理提供了对粒度组成影响的有效补偿。