Meiyo Electric Co., Ltd.

Diesel United, Ltd.

Mitsui E&s Du Co., Ltd.

Shigeki Kagomiya

Takashi Fujii

Provided is a magnetic material concentration measuring device including: a bobbin having an outer circumference around which an exciting coil, an output coil, and a further exciting coil are wound; an eccentric hole formed in the bobbin; a rotor that is rotatably fitted in the eccentric hole about an eccentric axis line; a first cutout part that forms a first flow passage on one end side in an eccentric axis line direction of the rotor; a second cutout part that forms a second flow passage whose angle is shifted in a rotor rotation direction with respect to the first cutout part, on another end side in the eccentric axis line direction of the rotor; and a communication passage that connects the first flow passage and the second flow passage.

Magnetic material concentration measuring device

A device for measuring a concentration of magnetic material has exciting coilsand an output coilwhich generates exciting voltage when alternating current flows through the exciting coils. Measurement meansis provided to measure variation in phase difference between voltages of the exciting and output coilsand, so that a concentration of magnetic material is measured with high accuracy from variation in phase difference when a test object is caused to approach the exciting coilor/and the output coil. A minute concentration of magnetic material in the fluid is continuously measured.

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Shizuoka, Japan

Shigeki Kagomiya