FLOWMETER

PROBLEM TO BE SOLVED: To solve the problems that undesired substances such as iron powder are adsorbed in the tips of vanes of an impeller when the undesired substances are included in a fluid flowing from an upper stream since the tips of the vanes are provided with magnetic poles and that undesired substances rotating with the vanes come into contact with the inner wall of a conduit not only to resist the rotation of the impeller but also to prevent the rotation of the impeller if the tips of the vanes and the inner wall bite the undesired substances when the amount of adsorbed undesired substances has increased. SOLUTION: Protrusion parts are provided for the inner circumferential surface of the conduit in such a way as to oppose the magnetic poles of the rotator to make iron powder and other undesired substances adsorbed in the magnetic poles collide with the protrusion parts and remove them from the magnetic poles in a flowmeter. COPYRIGHT: (C)2010,JPO&INPIT