Combined pickoff and oscillatory driver for use in coriolis...

G - Physics – 01 – F

Patent

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G01F 1/84 (2006.01)

Patent

CA 2301620

An oscillatory vibration driver (104) is operably connected to a Coriolis flowmeter (10) for use in vibrating the meter flow tubes (103A and 103B). The meter electronics (20) contain a mimetic circuit (414, 802, 902) that permits use of the driver as a signal pickoff which provides a measurement of back electromotive force for use in calculating mass flow rate and density from the Coriolis flowmeter. The mimetic circuit contains an analog coil (604) and magnet (600) that facilitate the measurement of back electromotive force, or the mimetic circuit may comprise digital means (804, 806, 808, 904, 906).

L'invention concerne un dispositif d'entraînement oscillant (104) fonctionnellement relié à un débitmètre massique à effet de Coriolis (10) et destiné à faire vibrer les tubes (103A, 103B) d'écoulement du débitmètre. Le module électronique de mesure (20) renferme un circuit mimétique (414, 802, 902) qui permet d'utiliser le dispositif d'entraînement comme détecteur de signaux. Celui-ci fournit une mesure de la force contre-électromotrice, qui est utilisée dans le calcul du débit massique et de la densité à partir du débitmètre. Le circuit mimétique contient soit une bobine (604) de circuit analogique et un aimant (600), qui facilitent la mesure de la force contre-électromotrice, soit un module numérique (804, 808, 904, 906).

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