Electrical conductivity of Amaranthus seeds in viewpoint of moisture measurement
2000
Hlavacova, Z. | Slovak Agricultural University, Nitra (Slovak Republic). Department of Physics)
The influence of moisture content and bulk density on electrical conductance and resistance of Amaranthus seeds are described in this paper. The graphic representation of volt-ampere characteristics for samples have linear or power character. The graphic representations of the conductance, conductivity and resistivity depending on the moisture content, on bulk density are presented. With a rise in bulk density of loosed samples increasing the contact surface between the seeds, the conductance of the pack increases rapidly. A similar relationship was also seen for the conductivity. The relation between the conductivity of seed and the moisture content has the characteristics of a increasing power function. Recently, no separate norm exists for determining the moisture content of Amaranthus seeds. On the basis of the presented measurement for the determination of the moisture content, the use of the gravimetric method by drying the sample of unmilled seed of 5 g mass at a temperature of 103 deg C +/- 2 deg C for 4 hours is recommended. The influence of temperature and bulk density on the electrical properties results in errors in electrical moisture meters.
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