The accuracy level of the load cell includes technical indicators such as the sensor's nonlinearity, creep, creep recovery, hysteresis, repeatability, and sensitivity. When choosing a sensor, don't simply pursue a high-grade sensor, but consider both the accuracy requirements of the electronic scale and its cost.
The selection of the load cell level must meet the following two conditions:

1. Meet the requirements of instrument input. The weighing display instrument displays the weighing result after the output signal of the sensor is amplified and A/D converted. Therefore, the output signal of the sensor must be greater than or equal to the input signal required by the instrument, that is, the output sensitivity of the sensor is replaced by the matching formula of the sensor and the instrument, and the calculation result must be greater than or equal to the input sensitivity required by the instrument.
2. Meet the accuracy requirements of the entire electronic scale. An electronic scale is mainly composed of three parts: scale body, sensor and instrument. When selecting the accuracy of the sensor, the accuracy of the sensor should be slightly higher than the theoretical calculation value, because the theory is often limited by objective conditions. The strength of the body is poor, the performance of the instrument is not very good, the working environment of the scale is relatively bad and other factors directly affect the accuracy requirements of the scale.
In the process of selecting a load cell, the accuracy level of the sensor is also an important indicator, which affects the accuracy of weighing. First, it must meet the input requirements of the weighing display instrument. We can determine how to determine whether the sensor and meter are matched by substituting the following formula. The output sensitivity of the sensor * the excitation power supply voltage * the maximum weighing capacity of the scale, the division number of the scale * the number of sensors * the range of the sensor. The output signal of the sensor should not be less than the input signal required by the instrument.

Assume a quantitative packaging scale with a measuring range of 25kg and a maximum division number of 1000 divisions; the scale body adopts 3 sensors, the measuring range is 25kg, the sensitivity is 2.0±0.008mV/V, and the voltage of the arch bridge is 12V; the scale adopts a weighing instrument. Ask if the sensor matches the meter.

The input signal of the meter is found by reading the data: 2x12x25/1000x3x25=8μV/d>0.6μV/d. Therefore, they match.