The excitation (+) of the 4-wire load cell is connected to the red line.

The excitation (-) of the 4-wire load cell is connected with the black line.

The signal (+) of the 4-wire load cell is connected to the green line.

The signal (-) of the 4-wire load cell is connected to the white line.

Because the key materials of sensors are different: strain and elastomer, and the manufacturing process is different, the values of each sensor are inconsistent, mainly the sensitivity is inconsistent. By adjusting the potentiometer in the junction box, the sensitivity of each sensor is close to the same, thus ensuring the balance of the whole scale.

principle of operation

The weighed weight or truck is placed on the weighing platform. Under the action of gravity, the weighing platform transfers gravity to the elastic support, which makes the elastic body of the weighing sensor deform, and the strain gauge bridge attached to the elastic strain beam loses balance, and outputs a differential voltage signal proportional to the weight data, which is amplified by a linear amplifier. Then it is converted into digital signal by A/D, and the weight signal is calculated and decoded by the microprocessor (CPU) of the instrument, and then the weight data is displayed directly.

Refer to the above content: Baidu Encyclopedia-Load Cell