Strain-gauge Load Cell Principle

Strain-gauge load cells are bonded onto a beam or structural member which gets deformed when weight is applied. In majority of the cases, four strain gages are employed to achieve maximum sensitivity and temperature compensation.

Two of the gauges remain generally in tension, and two in compression, and are wired with compensation adjustments. When weight is applied, the strain changes the electrical resistance of the gauges in proportion to the load.