Kett Electric Laboratory

Kuni Toki

Osamu Sindou

A voltage signal associated with the moisture content of a sample in grain or sand form is converted into a digital signal value by an analog-to-digital converter. A programmable read-only memory capable of erasure and field rewriting has stored therein conditions for computation and calibration parameters associated with various types of the sample. Upon designation of one of the types, the conditions for computation for the designated type of sample are picked up, and a moisture content is computed and digitally indicated by use of the computation parameters for the designated sample type. This moisture content value can be compensated for temperature, and the conditions for computation and the calibration parameters in EPROM are capable of being erased or rewritten.

Electric moisture meter

Apparatus for electrically measuring the water content of a specimen such as grain the electric resistivity of which has a correlation with the water content, comprising a linearizer for converting the measured electric resistivity in the low water content region in which the electric resistivity of a grain specimen changes non-linearly with the water content into an electric quantity linearly changing with the water content, and a temperature compensator including a temperature sensitive element for generating a linearly changing electric signal with temperature, the temperature compensator generating a temperature-compensating electric signal from said linearly changing temperature signal, the temperature compensation of the measured value being commonly done with said temperature compensator in both the low and the high water content ranges by adding a linearly changing electric quantity corresponding to the measured water content and the compensating electric signal.

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Tokyo, Japan

Kuni Toki