| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a Coriolis-type mass flowmeter, capable of preventing degradation of measurement accuracy due to noise at coils, irrespective of positive or negative grounding connection of external power supplies. Ž<P>SOLUTION: The flowmeter has a shaker shaking a fluid pipe 1 for flowing a measured fluid; a pair of detectors provided separately each other, along a channel of the fluid pipe 1 and detecting the vibrating condition of the fluid pipe 1, and a calculation means for calculating the mass flow of the measured fluid flowing into the channel of the fluid pipe 1, based on the relative amount detected by the detectors. The flowmeter comprises a shaking circuit 34, which is power fed in a non-insulated manner from an external power supply 40, to supply electric power to the coil 22 and to drive a magnetic substance; an insulation means 26 for insulating the coil 22 from the magnetic substance and/or the conductive fluid pipe 1; and a shielding means 27 shielding the coil 22, shunted into a stable potential, with respect to the external power supply 40, to the magnetic substance and the fluid pipe 1. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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