Test and determination of the accuracy level of the weighing sensor

The accuracy level of the weighing sensor includes the nonlinearity, creep, repeatability, lag, sensitivity and other technical indicators of the sensor. It should not blindly pursue the high-grade sensor, but the accuracy level and cost of the electronic scale should be considered.

Test method for the accuracy grade of the weighing sensor

1) Simplification is used in engineering technologyload cellThe representation method of accuracy, referring to the accuracy level concept. The accuracy level of the weighing sensor is expressed by a series of standard percentage values, for example, the accuracy level of the weighing sensor is 0.05,0.1,0.2,0.5,1.0,1.5,2.5, etc. In the design of the weighing sensor and the factory inspection, the accuracy level represents the maximum allowable error of the weighing sensor measurement. Solid state molecules have certain steady state microstructure, when it is the external force will deviate from the original structure and produce certain deformation, when external removal, and instinctively return to the original structure, but the recovery process should be the oscillation attenuation, like a swing, push the external force after removing N oscillation attenuation to stabilize the lowest point. Therefore, we assume that the release process of stress is fluctuating, but the amplitude of fluctuations will be progressively smaller.

2) As we all know, aluminum profile will produce great stress in the process of extrusion processing. The best way to eliminate the accuracy of the weighing sensor is to put it in the open air and let it naturally eliminate the sun and rain for a long time. In the aluminum elastomer saw, iron and other processing process will also produce stress, there should also be a release process. Celtron According to the previous test experience, due to the sandblasting, the patch after the pressure and high temperature baking and the stress after the glue has a gradual release process, so the parameters of the weighing sensor accuracy grade test just done from the patch to the glue can only be used for reference, not an absolute conclusion.

3) usually weighing sensor accuracy level of a single sensitive element and a single transmitter sensor, the output of a human characteristics is poor, if the differential, symmetry structure and differential circuit (such as bridge) combined differential technology, can eliminate zero value, reduce nonlinearity, improve sensitivity, realize the temperature compensation and offset common mode error interference effect, improve the technical performance of the sensor to improve the accuracy of the weighing sensor. The accuracy level of the weighing sensor is expressed by the percentage of the ratio of the maximum basic error to the full range. The basic error is composed of both systematic error and random error. The error represented by hysteresis and linearity is the systematic error of the weighing sensor, and the error represented by reproducibility is the random error.

 How to determine the accuracy level of the weighing sensor

 The accuracy level of the weighing sensor includes the nonlinearity, creep, repeatability, lag, sensitivity and other technical indicators of the sensor. It should not blindly pursue the high-grade sensor, but the accuracy level and cost of the electronic scale should be considered.

 In general, the total accuracy of the selected sensor is the sum of the non-linear, non-repeatable and lag indexes, which is slightly higher than the accuracy of the scale.

 The accuracy level of the weighing sensor refers to the degree of reliability of the measurement results, which represents the ability to repeat a certain reading with a given accuracy. The smaller the error, the higher the accuracy of the sensor. Sensor and instrument have the accuracy of 1 / 3000, the general domestic weighing sensor belongs to C3 grade, C3 means 3000 degrees, and the accuracy of 1 / 3000, the accuracy of imported weighing sensor will be relatively higher.

First, it must meet the requirements of the weighing display instrument input. The output signal of the weighing sensor is amplified, and the A / D conversion process shows the index of the weighing result. In view of this, the output signal of the sensor should not be less than the size of the input signal of the required instrument, which is the output sensitivity of the sensor?? The matching formula of the sensor and the meter is introduced, and the result is greater than or equal to the sensitivity requirement of the input instrument.

 Secmental size * sensor * Number of sensors

 Set up quantitative packing scale, weight 25 KG, indexed zui large number of departments in 1000 three L-BE-25 sensors, range of 25 kg ±2.00.008mV/V, 12V arch bridge electric pressure sensitivity with human scale, scale AD4325 instrumentation. When asked about the match between the selected sensors and the instruments.

Check the sensitivity of input to AD4325 instrument 0.6 μ V / D, tripod sensor and instrument matching the current input signal: 21225 / 1000325=8 μ V / D 0.6 μ V / D, therefore, satisfactorily simplify the output signal of the sensor should not be less than the size of the input signal required by the instrument, make the match between them.

 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. Normally, electronic body scales are made by scales,sensor, appearance, Slightly greater than the theoretical value, When selecting the accuracy of the load force sensor, Precision of the weighing cell, But due to the theory, Usually restricted by objective conditions, for instance, The performance of the instrument is not good strength, Large-scale work conditions are the direct effects of the causes of relative poverty, The accuracy of the scale, And thus improve all the requirements, When selecting the weighing sensor accuracy, The accuracy of the weighing cell shall be slightly greater than that calculated in theory, But because theories are generally restricted by objective conditions, For example, the strength of the scale is almost that strong, The performance of the instrument is not very good, the working environment of the scale is relatively bad and other reasons directly affect the accuracy requirements of the scale, So the requirements have to be raised in all aspects, To consider the economic benefits, And to ensure that the purpose of weighing is achieved.

 We choose to load cells rather than indulge in its high quality pursuit and meet their own use needs is zai good load cell level. Usually, the higher the level, the more expensive the price is considered as a comprehensive consideration.

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