초록 ▼

An electromagnetic flowmeter comprises a ceramic measuring tube through which fluid to be measured flows, a pair of electromagnetic coils disposed on the outer surface of the measuring tube in the central region thereof at diametrically opposite positions and generating a magnetic field in a directi

An electromagnetic flowmeter comprises a ceramic measuring tube through which fluid to be measured flows, a pair of electromagnetic coils disposed on the outer surface of the measuring tube in the central region thereof at diametrically opposite positions and generating a magnetic field in a direction perpendicular to the direction of flow of the fluid, a pair of measuring electrodes fixed to the outer surface of the measuring tube in the central region thereof at diametrically opposite positions and having electrode axes perpendicular to both the direction of flow of the fluid and the direction of the magnetic field, and a pair of metallic shields fixed to the outer surface of the measuring tube in surrounding relation to the measuring electrodes. A pair of the measuring electrodes and a pair of the metallic shields are fixed to the ceramic measuring tube by a reaction product due to an interface reaction with the ceramic measuring tube under heating.

대표청구항 ▼

An apparatus comprising: a ceramic measuring tube through which fluid to be measured flows, a pair of electromagnetic coils disposed on an outer surface of said measuring tube at substantially a central longitudinal region thereof at diametrically opposite positions and generating a magnetic field i

An apparatus comprising: a ceramic measuring tube through which fluid to be measured flows, a pair of electromagnetic coils disposed on an outer surface of said measuring tube at substantially a central longitudinal region thereof at diametrically opposite positions and generating a magnetic field in a direction perpendicular to a direction of flow of said fluid, a pair of measuring electrodes fixed to said outer surface of said measuring tube at substantially said central longitudinal region thereof at diametrically opposite positions and having electrode axes perpendicular to both said direction of flow of said fluid and said direction of said magnetic field, said measuring electrodes being fixed by a reaction product due to an interface reaction with said ceramic measuring tube under heating, and a pair of metallic shields fixed to said outer surface of said measuring tube in surrounding relation to said measuring electrodes by a reaction product due to an interface reaction with said ceramic measuring tube under heating, wherein said ceramic measuring tube is formed of at least one material selected from alumina, zirconia, sialon, silicon nitride and silicon carbide, and said measuring electrodes and said shields are formed of at least one material selected from alloys containing titanium and an aluminum silicon base alloy.