| 摘要 |
PROBLEM TO BE SOLVED: To make detectable the deposit quantity of magnetic scale in a piping by winding a conductor wire around the outer circumference of the piping and connecting a power source and a current detector to it. SOLUTION: A conductor wire 3 is wound around the outer circumference of a nonmagnetic piping 1 to form a coil. The coil is energized by an AC power source 4. A current detector 5 and a variable resistor 6 are inserted in this electric circuit to measure the current. If a magnetic body 2 is deposited in the piping 1, the flux density in an AC magnetic field induced by the coil changes and the deposit quantity of the magnetic body 2 can be detected. Thus, the magnetic scale deposit quantity in the piping can be easily estimated even during operating only by monitoring the current value and the work for systematically removing the deposit in the piping can be made efficiently.
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