The strain gauge-elastic member combination device used to measure load or weight is called a weighing transducer. It uses the elastic element as the main sensor and the strain gauge as the auxiliary sensor.

　　Place a suitable flat area on the elastic piece as a counterweight frame. Then, the strain gauge is attached to the elastic member.

　　Construction of weighing transducer

　　When a load is applied, the elastic member will deform or deflect.

　　Since the strain gauge is attached to the elastic member, the strain gauge may be stretched or compressed due to tension. This changed its length, which in turn changed its resistance.

　　By measuring the change in the resistance of the strain gauge, the applied load can be calculated.

　　When a load is applied, due to tension, two strain gauges are subject to elongation or tensile stress, while the other two are subject to compression.

　　Load cell bridge circuit

　　Since the weighing transducer is a cylinder, the axial compressive load will cause the negative strain in the vertical strain gauge and the positive strain in the circumferential strain gauge.

　　The two strains are not equal. By using a bridge circuit, the resistance of the strain gauge can be measured, thereby measuring the unknown applied load.

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