Title:
SQUARE WAVE EXCITATING ELECTROMAGNETIC FLOWMETER
Document Type and Number:
Japanese Patent JPH02280012
Kind Code:
A
Abstract:
PURPOSE:To obtain a compact electromagnetic flowmeter with high accuracy by giving reciprocally alternating constant-magnetic fields by rotating a permanent magnet, and sampling a signal generated in an electrode in the prescribed time. CONSTITUTION:A rotary gear 6 is provided on the outer periphery of a non- magnetic conduit 1 whose inside surface is constituted of an electric insulating material, and the plate 9 of a ferromagnetic material which is combined with a magnetic circuit and to which permanent magnets 10, 10' are fixed is fixed thereto, and drive with a motor 7 by engaging a gear 6 and a gear 8. Subsequently, in a position where the permanent magnets 10, 10' become vertical to both a pipe axis and a line for connecting a pair of electrodes 4, 4, the motor 7 is stopped temporarily, and a signal generated in the electrodes 4, 4 is brought to sampling. Also, at the time of becoming a reverse position, it is stopped temporarily and sampling is executed again. In such a manner, by giving reciprocally alternating constant-magnetic fields and executing a square wave excitation, the compact flowmeter with the high accuracy is obtained.
Inventors:
FUKUDA RYUHEI
Application Number:
JP10095989A
Publication Date:
November 16, 1990
Filing Date:
April 20, 1989
Export Citation:
Assignee:
FUKUDA RYUHEI
International Classes:
G01F1/58; (IPC1-7): G01F1/58