The quality of the load cell largely determines the performance of the electronic scale. So how do we judge the quality of the load cell?
- Safe limit load and limit overload of electronic scale: the maximum axial load that can be applied to the load cell. At this time, the load cell will not produce permanent drift beyond the specified value in terms of performance characteristics. When working beyond this value, the sensor will be damaged.
- The measurement range of the load cell: the range of the measured mass, and the measurement result will not exceed the maximum allowable error within this range.
- The division value of the weighing sensor of the electronic scale: the size of one of the parts after the measurement range i of the weighing sensor is divided into equal parts.
- Load cell verification division value: for accurate classification, the load cell division value expressed in mass units is used in the load cell test.
- Load cell output: The measured mass is measurable through the conversion of the load cell.
- The minimum calibration division value of the load cell of the electronic scale: the minimum calibration division value that the measurement range of the load cell can be divided into.
- Nonlinearity: It indicates the accuracy of the corresponding relationship between the output voltage signal of the sensor and the load, specifically the deviation between the calibration curve of the load cell process and the theoretical straight line.
- Excitation voltage: the normal voltage required for the sensor to work, generally 5-10v.
- Insulation resistance: Insulation resistance is equivalent to connecting a resistor with an equivalent resistance in series between the sensor bridge and the ground. Specifically, it refers to the resistance between the elastic beam of the load cell and the strain gauge.
- Sensitivity: the ratio of the output increment to the added load increment. When sensors from different manufacturers are used in combination, attention must be paid to the consistency of sensitivity.
- Creep: The change of the load cell's full load output over time under the constant condition that the load remains unchanged and all environmental conditions and other variables remain unchanged. Correspondingly, there are also creep recovery parameters.
If you start from the above aspects, I believe you can pick out a good sensor and buy a good electronic scale!