In general, the thinner the wire of the load cell sensor, the greater is resistance. When the metal resistance wire stretches under the action of external force, the resistance value will increase or decrease within a certain range. Therefore, if the metal wire (or film) is tightly attached to the measured object, the measured object will be under the action of external force. When stretched, the metal resistance wire will stretch proportionally and its resistance value will change accordingly.
The working principle of load cell sensor is that the metal resistance wire is stretched and thinned under tension, and then the resistance increases, and the metal resistance changes with the strain it is subjected to. In addition, the load cell sensor is a conversion device for converting a weight signal or a pressure signal into an electric quantity signal, and it’s construction principle is based on the property of metal resistance to hinder the flow of electric current.
As we all know, the elastic body of the load cell sensor is a structure with a special shape. First of all, it can withstand the external force of the load cell and generate a reaction force with the external force to achieve relative static balance. Second, it’s elastomer can generate a high-quality strain field (area) to adhere to that area, so the load cell’s elastomer is ideal for the task of strain signal conversion.