An effective method of bulk materials moisture measurement using capacitive sensors |
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| Affiliation: | 1. Doctor of Engineering Sciences, Dean of the Aircraft Control Systems Faculty in National Aerospace University, Kharkiv Aviation Institute, St. Chkalov 17, 61070, Kharkiv, Ukraine;2. Doctor of Engineering Sciences, Head of the Intellectual Instrumentation Systems and Quality Management Department in National Aerospace University, Kharkiv Aviation Institute, St. Chkalov 17, 61070, Kharkiv, Ukraine;1. Henan University of Technology, Collaborative Innovation Center of Henan Grain Crops, Henan Collaborative Innovation Center of Grain Storage and Security, Zhengzhou, 450001, China;2. Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB, R3T 5V6, Canada;1. Research Center for Family Agriculture, Agricultural Research and Rural Extension Company of Santa Catarina (CEPAF/EPAGRI), Chapecó, Santa Catarina, Brazil;2. Department of Chemistry, Federal University of São Carlos (UFSCar), São Carlos, São Paulo, Brazil;3. Department of Entomology and Acarology, “Luiz de Queiroz” College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, São Paulo, Brazil;1. College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China;2. Guizhou Provincial Key Laboratory for Rare Animal and Economic Insect of the Mountainous Region, College of Biology and Environmental Engineering, Guiyang University, Guiyang, China;1. Ministry of Agriculture and Forestry, Ankara Directorate of Provincial Agricultural and Forestry, Sereflikochisar, Ankara, Turkey;2. Ankara University, Kalecik Vocational School, Kalecik, Ankara, 06870, Turkey;3. Ankara University, Faculty of Agriculture, Department of Plant Protection, Diskapi, Ankara, 06110, Turkey |
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| 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. |
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| Keywords: | Instrument measuring transducer Granulometric composition Method of moisture measurement Type uncertainty method error Accuracy estimation Bulk materials |
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