G - Physics – 01 – F
Patent
G - Physics
01
F
324/49
G01F 1/60 (2006.01)
Patent
CA 1136219
HIGH-VOLTAGE IMPULSE DRIVER FOR ELECTROMAGNETIC FLOWMETER Inventor: Roy F. Schmoock, a citizen of the United States of America and resident of Richboro, Pennsylvania ABSTRACT OF DISCLOSURE A drive system for an electromagnetic flowmeter wherein the fluid to be metered is conducted through a flow tube to intersect a transverse magnetic field created by an electro- magnet having an excitation coil. The resultant voltage induced in the fluid is transferred to a pair of electrodes mounted at diametrically-opposed points on the tube to yield a signal repre- senting flow rate. The drive system, which is powered from an a-c line, includes a full-wave rectifier whose output voltage is applied periodically to the excitation coil at a rate which is low relative to the line frequency. In order to maintain the level of current through the coil at a substan- tially constant level during the excitation period without, how- ever, consuming an undue amount of energy, the coil is shock- excited by a high voltage surge derived from the rectifier to generate a current flow therein having a substantially constant current level, thereby producing a steady-state flux field minimizing the presence of unwanted components in the output signal of the flowmeter. -1-
332463
Fischer & Porter Company
Smart & Biggar
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