| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrostatic capacity type moisture detector capable of accurately detecting the moisture of a moisture-containing material such as a particulate material such as various grains, wood or garbage from the outside of a tank or the like. SOLUTION: In the moisture detector applying a rectangular wave voltage to the detection electrode 3, which is arranged through a non-conductive partition wall (tank wall or the like) with respect to a material to be detected (garbage or the like), through a resistor 7 and outputting a detection signal on the basis of the rising and falling time lag of the rectangular wave voltage in the detection electrode 3 by an RC circuit through the resistor 7 and the material to be detected (garbage or the like), a second electrode 4 to which a rectangular wave voltage having the same phase and frequency as the rectangular wave voltage applied to the detection electrode is applied, is provided and the RC circuit through a dielectric such as water present along the partition wall (tank wall or the like) in a laminar state is cut off by the potential of the second electrode 4.
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