Weigh Hopper
The loss-in-weight measurement is a reliable and well-proven method to measure the throughput of extruders and feeders. When the valve is closed and the hopper is full the load cell measures a loss in weight over a period of time corresponding to the material fed into the extruder or feeder.
Key Points
The process value of throughput is derived from the difference in weight over a difference in time. In closed-loop control, the process value has to reach a given set point by changing the screw speed accordingly.