The resistance strain type load cell (hereinafter referred to as load cell) is composed of an elastic element (sensing element), a resistance strain gauge (strain resistance conversion element), and a Wheatstone bridge circuit (transformation circuit).

The weight of the measured object acts on the elastic element to deform it to produce a strain. The resistance strain gauge attached to the elastic element converts the strain corresponding to the weight of the object into a resistance change, and then the resistance is passed through the Wheatstone bridge circuit. The change is converted into a voltage output, and the voltage measurement output is measured by a secondary meter to complete the weighing measurement task.

The working principle of the load cell is as follows:

Load → elastic element → resistance strain gauge → Wheatstone bridge → secondary instrument (acquisition of measured value) → output data

The resistance strain gauge is used to manufacture sensitive components for measuring many physical quantity sensors. The strain resistance conversion element is attached to the elastic element of the load cell. It is the core component of the load cell.