| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic flowmeter capable of detecting mixing of bubbles even when the amount of mixed bubbles is small. SOLUTION: The electromagnetic flowmeter includes: electrodes 12 and 13 arranged symmetrically with respect to an earth electrode 11 provided in piping 1 and capturing electromotive force generated by a fluid; a coil 22 and an excitation circuit 21 forming an electric field in the piping 1; an amplification device 3 for amplifying a potential difference (electromotive force) between the electrodes 12 and 13; and an arithmetic device 4 for performing an operation on the basis of an output voltage value of the amplification device 3. The arithmetic device 4 includes: a detection means 41 for detecting the degree of fluctuation of the electromotive force generated by the fluid in the piping 1 on the basis of the output voltage value of the amplification device 3; and a decision means 42 for determining the presence of bubbles in the fluid on the basis of the degree of fluctuation detected by the detection means 41. COPYRIGHT: (C)2011,JPO&INPIT
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