The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 1985
Filed:
Sep. 30, 1983
David C Bohn, Stillwater Township, Washington County, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A travelling wave magnetic flowmeter senses the velocity of flow of an electrically conductive fluid through a conduit and provides an output signal representative of the velocity of flow. A first pair of coils providing a first magnetic field and a second pair of coils providing a second magnetic field are disposed on the conduit. The first and second magnetic fields are varied in strength and at least partially combined to form a travelling composite magnetic field, a portion of which interacts with the fluid to induce an electromotive force. A pair of electrodes are electrically isolated from the conduit and disposed in the conduit between the first and second coils. The electrodes are electrically coupled to the fluid to provide a detected signal representative of the electromotive force. A control circuit coupled to the first and second coils and coupled to the electrodes to receive the detected signal, controls an electrical current shifted between the first coils and the second coils such that the travelling composite magnetic field travels in the direction of fluid flow at a speed representative of the fluid velocity.