Capacitance type electromagnetic flowmeter

Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties

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7386108, G01F 158

Patent

active

055266983

ABSTRACT:
A capacitance type electromagnetic flowmeter whose output is relatively free from fluctuations caused by external vibrations has a flow tube supported in a casing member by means of members having elasticity and viscosity (e.g., O-rings). Magnetic parts such as coils and a core are fixed to the casing member so as to define a space therewith, and protective rings are kept liquid-tight with respect to the flow tube by O-rings interposed therebetween. The equivalent mass of the flowmeter section vibrating integrally with the flow tube is reduced to increase the resonance frequency. Further, since the flow tube is insulated from vibrations of the protective rings, the flow is less subject to vibrations, thereby decreasing fluctuations in output due to external vibrations.

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patent: 5385055 (1995-01-01), Kubota et al.
patent: 5458003 (1995-10-01), Ishihara et al.

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