According to the International Recommendation No. 60 of the International Organization for Legal Metrology (OIML), load cells can be divided into 4 accuracy levels according to their comprehensive performance: A, B, C, and D. It also stipulates the upper and lower limits of the number of divisions for each level. #Weighing sensor#
ccuracy class A class B class C class D class
Min limit 50000 5000 500 100
Max limit Unlimited 100000 10000 1000
The maximum number of divisions to determine the accuracy level of the load cell is expressed in units of 1000.
For example: C3 represents a class C load cell with 3000 divisions.
The sensors used in general trade measurement need to reach the C3 level. That is 3000 divisions.
Single point load cell
Example: 1 30t load cell
Assuming that its verification division number is 3000, then its verification division value is 10kg.
Assuming that its verification division number is 2500, then his verification division value is 12kg.
Assuming that the sensor meets the requirements of the national standard under the verification scale of 3000, then the level of this sensor is C3. If it can only be verified to reach the standard under 2500 divisions, then this sensor is C2.5 level. If the lower one can only reach the standard under 1000 divisions, then this sensor is C1 grade, and the verification division value at this time is 30kg.
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Selection of precision level
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 of all, it must meet the input requirements of the weighing display instrument. We can determine how to determine whether the sensor and the meter match by substituting the following formula. The output sensitivity of the sensor * excitation power supply voltage * the maximum weighing of the scale, the number of divisions 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.
Assuming a quantitative packaging scale with a measuring range of 25kg, the maximum number of divisions is 1000 divisions; the scale body adopts 3 sensors, the measuring range is 25kg, the sensitivity is 2.0±0.008mV/V, and the arch bridge voltage force is 12V; the scale adopts a weighing instrument. Ask whether the sensor and the meter match.
The input signal of the instrument is found by reading the information: 2x12x25/1000x3x25=8μV/d>0.6μV/d. Therefore, there is a match between them.