Machines without load cells: The system relies on volumetric
calculation from the known gate height and width, and a known
product density (or selecting the product from a pre-defined list). It
works best for relatively free-flowing material of consistent density.
Machines with load cells: Load cells enable fully-automatic,
continuous calibration. They are advantageous for controlling the rate
of material with more variable density. By constantly measuring the
weight of product in the spreader, the floor (belt) speed is
continuously adjusted to achieve the correct target application rate.
The system quickly reacts to changes in product characteristics or
spreading conditions without having to adjust or re-calibrate the
Other spreader functions, such as spinner speed, can also be
monitored, with warnings being triggered if they are not operating