Abstract: An apparatus for weighing the mass flow of fluent material, especially of particulate type. The apparatus includes a rectilinear and inclined measuring plate on which the material is sliding. The measuring plate is fastened at a central portion of the plate. The fastening device includes one moment measuring unit configured to measure the moment around a horizontal axis crossing the vertical axis. The moment measuring unit is attached to a force measuring unit configured to measure the force directed in or parallel to the vertical axis. The force measuring unit is coupled for support to physical ground, and the material flow is determined by a calculating unit from the output signals from the moment measuring unit and the force measuring unit by determining the forces exerted on the measuring plate and substantially in the direction of the flow.

Abstract: The invention relates to an impeller being rotated around an axis for a mass flow measuring device receiving inflow of material through an inlet tube. To improve the measurement accuracy, the fan character of the impeller is reduced. This is obtained by two design principles which can be combined. The impeller includes a number of mainly radially directed vanes. That side of each vane along which the measured material flows is formed as a duct with a cross-sectional area which decreases in the direction from the center of the impeller. The other principle is to reduce the airflow by use of an upside down bowl shaped cowling placed over the impeller.

Abstract: A method for zero setting of a measuring device in which particles to be measured are subjected to tangential acceleration in a whirling impeller and torque exerted on the vanes of the impeller in reaction to the Coriolis force of acceleration of the particles is being measured as an indication of mass flow rate. The flow of material is fed to a central part of the impeller and by centrifugal force is thrown outwardly of the impeller. The flow is measured by an electronic device including a microcomputer. When the flow is absent, such condition being continually sensed for, the mean value of the torque during a chosen time or a number of revolutions of the impeller is automatically determined and memorized. This memorized torque value is used as a tare value until a next time a new tare value can be memorized.