This system is a rod-shaped gamma source whose type, length and activity distribution is matched to the conveyor system. Material loading is installed below the mass flow in a lockable shielding with a collimated radiation opening. It is used to measure the flow rate of a stream of solids. The measuring principle of displacement sensors consists of a powered turbine wheel through which measured material flows. Material flow will be forced to accelerate through the turbine, thereby causing a braking effect, which is measured as torque on the turbine shaft.
Measurement is made with a special torque transducer and a turbine speed pickup.
Angular Momentum Sensors. These sensors can be used to measure flow during free-fall. Dry bulk materials enter the flow sensor and produce a mechanical deflection as the flow strikes the sensing plate. The horizontal force of this deflection is converted into an electrical signal and processed by associated electronics. Used in many solids flow applications and for simple flow rate indication to certified precision weighing, weighing is performed by load cells supporting part of the conveying mechanism and a speed measurement of the conveying equipment.