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What is a load cell?

Views: 0     Author: Site Editor     Publish Time: 2022-07-25      Origin: Site


The load cell is actually a device that converts the quality signal into a measurable electrical signal output. The actual working environment of the sensor should be considered first when using the sensor. This is very important for the correct selection of the load cell. It is related to the normal operation of the sensor, its safety and service life, and the reliability and safety of the entire weighing instrument. Sex. In the basic concepts and evaluation methods of the main technical indicators of the load cell, there are qualitative differences between the new and the old national standards. There are mainly S type load cell, cantilever type load cell, spoke type load cell, plate ring type load cell, bellows type load cell, bridge type load cell, column cylinder type  load cell and other styles load cell.

Basic Introduction of Load Cell:

The old national standard considers the two sensors of "weighing" and "force measurement" with completely different application objects and use environmental conditions into one, without distinguishing between test and evaluation methods. The old national standard has a total of 21 indicators, all of which are tested at room temperature; and the maximum error among the six indicators of non-linearity, hysteresis error, repeatability error, creep, additional error of zero temperature and additional error of rated output temperature is used to determine the weighing The accuracy level of the sensor is expressed as 0.02, 0.03, and 0.05 respectively.

A force sensor used on weighing instruments. It can convert the gravity acting on the measured object into a measurable output signal in a certain proportion.

Considering the influence of gravitational acceleration and air buoyancy in different places of use on conversion, the performance indicators of load cells mainly include linearity error, hysteresis error, repeatability error, creep, zero temperature characteristic and sensitivity temperature characteristic. In various weighing instruments and quality measurement systems, the integrated error is usually used to bring the accuracy of the integrated control load cell sensor, and the integrated error band is linked with the error band of the weighing instrument in order to select a weighing sensor corresponding to a certain accuracy of the weighing instrument weighing indicator. The International Organization for Legal Metrology (OIML) stipulates that the error band δ of the sensor accounts for 70% of the error band Δ of the weighing instrument weighing indicator. The linearity error, hysteresis error of the load cell, and the error caused by the influence of temperature on the sensitivity within the specified temperature range, etc. The sum cannot exceed the error band δ. This allows the manufacturer to adjust the various components that make up the total error of the measurement to obtain the desired accuracy.

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