Load Cell Type
Load cell type
There are many types of load cells, suitable for different applications. Commonly used ones include:
Single-point load cell: Generally used in platform scales, which are placed under the weight.
Curved beam load cell: Multiple load cells are placed under the steel structure and load heavy objects from above.
Compression force sensor: A number of long-range load cells are placed under the steel structure and load heavy objects from above.
Tensile force load cell: The weight is suspended under one or more sensors.
Many load cells have other features, such as special designs or features, etc., depending on the application, for example, if the system needs to be cleaned thoroughly every day. The load cell requires a higher degree of protection and tightness.
Load cells can also be classified according to the type of signal transmission: digital load cells have built-in electronic components that are used to process measurement results and display and transmit them. For analog load cells, additional equipment-a measuring amplifier is required.
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The four strain gauges are fixed to the load cell below, and the maximum deformation occurs when force is applied. The direction of the arrow is the direction of force application.
Load cell accuracy
No matter what kind of load cell is used, accuracy plays a very important role. The load cell has different maximum ranges (the maximum range refers to the maximum expected load) and accuracy levels. The accuracy levels of strain technology are generally C and D. Strain load cells with electronic correction have higher accuracy levels.
Therefore, weighing must be strictly controlled. For low-value goods (such as sand or gravel), the load cell does not need to be very precise-D-level accuracy is sufficient. On the other hand, for pharmaceutical products, the highest precision grade A or B is required. The most common consumer products such as meat, fruits and vegetables are weighed with an accuracy class of C, which requires high accuracy for the weighing system used. But mechanical engineering or building materials weighing instruments also require C-level accuracy.
Strict weighing gauge standards continue to pose new challenges for load cell developers. For load cells with higher OIML accuracy levels, the accuracy deviation is only a few ppm (parts per million).