Low mass coriolis mass flowmeter having a low mass drive system

Details Low mass coriolis mass flowmeter having a low mass drive system Low mass coriolis mass flowmeter having a low mass drive system

G - Physics

01

F

G01F 1/84 (2006.01)

Patent

CA 2513419

A Coriolis mass flowmeter (300) having a low mass drive system comprising a driver coil (D) for vibrating flow tube means (102). The Coriolis mass flowmeter does not use a magnet affixed to the flow tube means. Instead, the flow tube means is coated with or is integral to magnetic material (103) that responds to the magnetic fields generated by the driver coil to vibrate the flow tube means. The flow tube means may comprise one (102) or more (1402C1, 1402C2) flow tubes. The magnetic material may be ferrous material devoid of an internal magnetic field. Alternatively the magnetic material may be steel or stainless steel having internal magnetic fields.

L'invention concerne un débitmètre massique de Coriolis (300) ayant un système de commande de faible masse comprenant une bobine d'excitation (D) permettant de faire vibrer les moyens du tube d'écoulement (102). Le débitmètre massique de Coriolis n'utilise pas d'aimant fixé aux moyens de tube d'écoulement. A la place, les moyens de tube d'écoulement sont revêtus ou solidaires d'une substance magnétique (103) répondant aux champs magnétiques générés par la bobine d'excitation afin de faire vibrer les moyens de tube d'écoulement. Ces moyens peuvent comprendre un (102) ou plusieurs (1402C1, 1402C2) tubes d'écoulement. La substance magnétique peut être une substance ferreuse exempte de champ magnétique interne. Selon une variante, la substance magnétique peut être un acier ou un acier inoxydable ayant des champs magnétiques internes.

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