Load Cell
Load cells are sensors that detect the weight force of an applied load and convert it into an electrical signal.
What are load cells used for?
They are central components of weighing technology and form the basis for precise weight detection in gravimetric feeding systems. In feeding technology, load cells are essential components of gravimetric feeding systems. Their measurements allow the amount of material fed and the feeding rate to be monitored and controlled as required.
How does a load cell work?
Many load cells work with strain gauges. When the load cell is subjected to load, an elastic measurement body deforms slightly. The strain gauges record this deformation through a change in their electrical resistance. The resulting measurement signal is processed by the weighing electronics and converted into a weight value.
In addition to analog load cells, digital load cells are also used. In digital systems, the measurement signal is processed and transmitted digitally. Depending on the model, filter and compensation functions can help reduce factors that interfere with the measurement.
What significance do load cells have for feeding technology?
In gravimetric feeders, load cells enable precise weight measurement. In a loss-in-weight feeder, for example, the hopper's weight – including its contents and the components weighed along with it – is continuously measured. From the weight loss per unit of time, the control system determines the actual feed rate and adjusts it in case of deviations from the target value.
Measurement accuracy depends, among other things, on the load cell's measuring range and resolution, as well as installation conditions. Vibrations, temperature fluctuations, and mechanical influences can impair the measurement result.