How the Strain Gauge Load Cell Works?
In the beginning the force or pressure is applied to the load column due to which it gets compressed and its length gets reduced. This column acts as the primary transducer since it converts the applied force into change in length, however this change in length is not measured directly. At the same time, the strain gauge connected to the load column gets compressed. This strain gauge acts as the secondary transducer since it records the displacement of the load column. Since the strain gauge is compressed, its length gets reduced, which depends on the magnitude of the applied force on the top of the load cell. As we know the resistance of the strain gauge changes when its length changes. This change in resistance can be recorded by the wires connected to the strain gauge. The resistance change is calibrated against the applied force, thus the recorder directly gives the value of the applied pressure or the force. For the measurement of the tensile force, usually the bonded wire type of
