| 摘要 |
PROBLEM TO BE SOLVED: To reduce an adverse effect on the performance of a Coriolis mass flowmeter by keeping the balance of two flow tubes. SOLUTION: A driving device which resonates and drives the two parallel flow tubes is provided. A pair of vibration detecting sensors which detect a phase difference proportional to the Coriolis force are provided. The driving device and the pair of sensors are constituted respectively of coils and magnets. A coil bracket whose natural frequency is nearly equal to the natural frequency of each flow tube is provided in the center between the two parallel tubes. The coil bracket is provided with the coils for the driving device and the pair of sensors. The magnets which correspond to the coils are attached so as to face the two flow tubes. Therefore, only the magnets for the driving device and the pair of sensors can be arranged at the two flow tubes so as to be a symmetric structure.
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