| 摘要 |
PURPOSE:To reduce power consumption, by providing first yokes of which the end surfaces are opposed to a flow pipe, a core and a second yokes, which are arranged between the aforementioned first yokes and the core to be superficially contacted with the aforementioned core in series, in a magnetic gap containing the flow pipe. CONSTITUTION:Electrodes 6, 7 are provided to a flow pipe 1 and first yokes 8, 9 are provided so that the end surfaces thereof are opposed to the flow pipe 1 and constituted of a soft magnetic material. Second yokes 11, 12 are constituted of a high magnetic permeability magnetic material having low electric conductivity and respectively arranged between the first yokes 8, 9 and a core 10 magnetically in series. The surface contact parts of the core 10 and the second yokes 11, 12 are held to a gap free state by superficial contact. As mentioned above, because the material having low electric conductivity is used as the material of the second yokes 11, 12, the eddy current generated in the second yokes when a pulse current is made to flow to a wire coil 5 to magnetize the coil 10 can be suppressed and power consumption can be reduced.
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