Potato Flow Rate Monitoring System

i want to measure the flow rate of potato on a Vertical inclined conveyor. i Have selected these:

Load Cell Roller ( 7MH7126-1BB5-Z C11)
Calibration Weight 7MH77241BC Speed Sensor 7MH7131-1BA10
integrator 7MH7152-2AB00-2AA

will this work…? or if not what is the most easy and ecomoical way to measure the flow rate of potato on belt.?