A load cell is a device that converts a mass signal into a measurable electrical output. According to the conversion method, the load cell can be divided into photoelectric type, hydraulic type, electromagnetic force type, capacitive type, magnetic pole change type, vibration type, resistance strain type, etc. Among them, the resistance strain type is the most widely used.

The working principle of the resistance strain gauge is to use the metal resistance strain gauge to form a measurement bridge, and to use the principle that the metal resistance wire elongates and becomes thinner under the action of tension, and the resistance increases. Generally speaking, the more slender the same metal, the greater its resistance value. When the metal resistance wire expands and contracts under the influence of external force, its resistance value will increase or decrease within a certain range. Therefore, the metal wire is attached to the surface of the object to be measured. When the object to be measured is stretched and contracted by external force, the resistance of the metal changes, and the resistance change affects the electrical signal. Load cells measure weight based on electrical signals generated by changes in resistance.


With the development of the intelligent era, load cells are used in almost all weighing fields to achieve accurate weighing of materials. Especially with the emergence of microprocessors and the continuous improvement of industrial automation technology, load cells have become a necessary device in process control. From the measurement of large materials that could not be weighed before, and the measurement and control of hook scales, car scales to the batching system that can mix and distribute a variety of raw materials, automatic detection in the production process, and powder feeding control are all perfect. Today, load cells are mainly used in various electronic weighing instruments, industrial control fields and other fields. The applied products include electronic truck scales, electronic hook scales, electronic pricing scales, and electronic steel scales.Electronic rail scales, hopper scales, batching scales, filling scales and so on.