Measuring device comprising an excitable frequency gauge

Details Measuring device comprising an excitable frequency gauge Measuring device comprising an excitable frequency gauge

G - Physics

01

N

G01N 11/14 (2006.01) G01N 9/34 (2006.01)

Patent

CA 2255697

A device for measuring a parameter such as the mass concentration or the viscosity of a fluid medium (2) such as a suspension or a liquid, including a rotor (3) for rotation in said medium, a drive motor (7) and a drive transmission with a drive shaft (9) for the rotor and a sensor device (10) for sensing the torque which is transmitted to the rotor and which represents said parameter. The device is distinguished by that the sensor device (10) includes an excitable frequency gauge which is deformed by said torque, and the prevailing natural frequency of which is dependent on the deformation and is directly detectable by a stationary detector (12), which is placed outside the transmission.

L'invention porte sur un dispositif de mesure d'un paramètre tel que la concentration de masse ou la concentration d'un milieu fluide (2) du type suspension ou liquide, comportant un rotor (3) tournant dans ledit liquide, un moteur d'entraînement (7), une transmission par arbre (9) entraînant le rotor, et un dispositif de mesure (10) mesurant le couple transmis au rotor, lequel représente le susdit paramètre. Le dispositif se distingue par le fait que le dispositif de mesure (10) comporte une sonde à fréquence modulable se déformant sous l'effet dudit couple et dont la fréquence naturelle principale, fonction de la déformation, est directement détectable à l'aide d'un détecteur fixe (12), extérieur à la transmission.

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