For the selection of weighing load cells, our primary concern is its application environment and actual needs. For example, the detection environment conditions and the volume requirements of the object to be measured. In addition, there are also the signal output method, whether it is wired or not, the measurement contact method, etc., which are all factors that we need to know in advance before choosing a load cell. Only after we understand our application requirements, and then apply the performance attributes of the load cell, will we have a clearer and more detailed range of alternatives and a more targeted reference direction.
After understanding the application environment and actual requirements of the load cell, it is necessary to look at the detailed parameters of the load cell. The two most important parameters of the load cell are accuracy and sensitivity. Some users have a lot of misunderstandings about these two parameters. Let’s correct them below:
Misunderstanding 1: The higher the sensitivity of the load cell, the better
In our impression, a high value of sensitivity often means a higher work effect. However, for the load cell, is such a reference indicator correct?
Technically speaking, only when the load cell maintains a higher sensitivity, the value of the output signal corresponding to the measured change will be larger, which can be more conducive to signal processing. Therefore, from this perspective, the higher the sensitivity of the load cell, the better is no problem.
However, we also cannot ignore another problem: as the sensitivity of the load cell increases, more conditions that have nothing to do with the object to be measured will be introduced, and will continue to be amplified as the sensitivity increases. Such a result will eventually have a lot of adverse effects on the accuracy of the measurement. Therefore, high-sensitivity load cells are definitely an aspect that we need to pay attention to but not blindly chasing high.
Moreover, for load cells, their sensitivity is directional. When the measured is a single vector, and its directivity has higher requirements, we don’t need other load cells with less sensitivity. When the measured is a multi-dimensional vector, we need to focus on selecting a load cell device with a small cross-sensitivity. It can be seen that the sensitivity of the load cell may not be as high as possible.
Misunderstanding 2: The greater the accuracy of the load cell, the better
The accuracy of the load cell is also another important indicator for judging its characteristics. The accuracy can be said to be an important link related to the accuracy and timeliness of the entire measurement system. Therefore, the accuracy of the load cell is also an important aspect that we cannot ignore.
However, does the accuracy of the load cell have to be selected? For the technical application of load cells, products with higher accuracy often mean higher prices. Is it true that only high-end prices can guarantee our measurement needs? Or, how should we grasp our needs?
In fact, if our measurement needs are relatively constant, we only need to choose a relatively cheap load cell with higher repeatability, instead of choosing a more expensive high-end product. Of course, if it is for quantitative analysis or for higher measurement requirements, then we must choose more accurate load cells to meet our applications.
Therefore, only by grasping our measurement requirements can the load cells we choose be more targeted, more economical, and more cost-effective.