The accuracy grade of a load cell includes technical indicators such as nonlinearity, creep, repeatability, hysteresis, and sensitivity. When selecting a load cell, one should not blindly pursue high-grade sensors but should consider the accuracy grade and cost of the electronic scale.

　　Testing Methods for Load Cell Accuracy Grade

　　1) In engineering technology, the concept of accuracy grade is used to simplify the representation of load cell accuracy. The accuracy grade of a load cell is represented by a series of standard percentage values, such as 0.05, 0.1, 0.2, 0.5, 1.0, 1.5, and 2.5. During the design and factory inspection of a load cell, the accuracy grade represents the maximum allowable error of the load cell measurement. Solid-state molecules have a certain steady-state microstructure. When subjected to external force, they deviate from their original structure and produce a certain deformation. When the external force is removed, they instinctively return to their original structure, but this recovery process should be an oscillatory decay, like swinging. After the external force is removed, it takes N oscillations to decay to a stable minimum point. Therefore, we assume that the stress release process is fluctuating, but the amplitude of the fluctuation will gradually decrease.

　　2) As we know, aluminum profiles produce a lot of stress during extrusion processing. The best way to eliminate the stress is to place them outdoors for a long time to allow natural elimination through sun and rain. Stress is also generated during the sawing and iron processing of aluminum elastic bodies, and there is a release process. Based on previous experiments, Celtron load cells have a gradual release process for stress from the processes of sandblasting, post-patching pressure, high-temperature baking, and gluing. Therefore, the accuracy grade test parameters of load cells that have just been made, from patching to gluing, can only be used as a reference and cannot be considered absolute conclusions.

　　3) Usually, the accuracy grade of a load cell is represented by the percentage of the maximum basic error within its full-scale range to the full-scale range. The basic error consists of systematic error and random error. The error represented by hysteresis and linearity is the systematic error of the load cell, and the error represented by repeatability is the random error. For a sensor composed of a single sensitive element and a single transducer, its output-input characteristics are poor. If differential, symmetrical structure, and differential circuits (such as bridges) are combined with differential technology, it can eliminate zero values, reduce nonlinearity, improve sensitivity, achieve temperature compensation, and offset common-mode error interference, improving the technical performance of the sensor and thus improving the accuracy of the load cell.

　　How to Determine the Accuracy Grade of a Load Cell

　　The accuracy grade of a load cell includes technical indicators such as nonlinearity, creep, repeatability, hysteresis, and sensitivity. When selecting a load cell, one should not blindly pursue high-grade sensors but should consider the accuracy grade and cost of the electronic scale.

　　Generally, the total accuracy of the selected sensor is slightly higher than the accuracy of the scale, which is the root mean square of the nonlinearity, non-repeatability, and hysteresis indicators.

　　The accuracy grade of a load cell refers to the reliability of the measurement results. It represents the ability to repeat a reading with a given accuracy. The smaller the error, the higher the accuracy of the sensor. Sensors and instruments generally have an accuracy of 1/3000. Generally, domestic load cells belong to the C3 grade, where C3 represents 3000 divisions, and the accuracy is 1/3000. Imported load cells have relatively higher accuracy.

　　First, it must meet the input requirements of the weighing display instrument. The output signal of the load cell is amplified and processed by A/D conversion to display the weighing results. Therefore, the output signal of the sensor should not be less than the required input signal of the instrument, that is, the output sensitivity of the sensor should meet the matching formula of the sensor and instrument, and the result should be greater than or equal to the input sensitivity requirements of the instrument.

　　Department Scale * Sensor * Sensor Quantity Range

　　A quantitative packaging scale is set with a weight of 25KG. The department with the largest index quantity is 1000 with three L-BE-25 sensors, with a range of 25kg ±2.00.008mV/V, 12V arch bridge pressure sensitivity, and a human body scale, scale AD4325 instrument. When asked about the matching between the selected sensor and instrument.

　　Check the sensitivity input to the AD4325 instrument: 0.6μV/D. The matching of the Ya Ding type sensor and instrument is the current input signal of the instrument: 2 × 12 × 25 / 1000 × 3 × 25 = 8μV/D » 0.6μV/D. Therefore, it is satisfactory. It can be simplified to that the output signal of the sensor should not be less than the required input signal of the instrument to ensure matching.

　　In addition to the input requirements of the weighing display, the load cell level also needs to meet the accuracy requirements of the entire electronic scale. Generally, an electronic human body scale consists of a scale, sensor, and instrument, slightly larger than the theoretical value. When selecting the accuracy of the load cell, the accuracy of the load cell is considered. However, due to theoretical and objective constraints, such as the poor strength of the scale body, the instrument performance is not very good, and the large-scale working environment is relatively poor, which directly affects the accuracy of the scale. Therefore, the requirements in various aspects should be improved. Both economic benefits and the purpose of weighing should be considered. When selecting the accuracy of the load cell, the accuracy of the load cell should be slightly larger than the theoretical calculated value. However, the theory is generally subject to objective conditions, such as the poor strength of the scale body, the instrument performance is not very good, and the working environment of the scale is relatively poor, which directly affects the accuracy requirements of the scale. Therefore, the requirements in various aspects should be improved.

　　When selecting a load cell, we should not be obsessed with its high quality but choose one that meets our needs. Generally, the higher the grade, the more expensive it is, so comprehensive consideration is needed.

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