how to test load cell sensor

Load cells are an essential part of many industrial applications, measuring weight, force, and other parameters. However, to ensure accurate measurements, load cell sensors need to undergo thorough and reliable testing. In this article, we will discuss everything you need to know about how to test load cell sensors.

Basics of Load Cell Sensor Testing

Before we dive into the testing process, let's first understand the basics of a load cell sensor. Load cells are transducers that convert mechanical force into electrical signals. They work by bending or deforming in response to the applied force and producing a proportional change in resistance. This change is then measured using a Wheatstone bridge circuit to obtain readings of the force or weight being applied.To test a load cell sensor, several key parameters should be evaluated to ensure its performance. These include linearity, hysteresis, repeatability, sensitivity, and stability. Let's learn more about each of them.

Linearity Testing

Linearity refers to the ability of a load cell to produce an output signal that is directly proportional to the applied force. Linearity testing involves applying various loads to the load cell and measuring the output signal. The readings should be compared with the expected values in a linear manner. Any deviation from linearity could indicate a faulty load cell and, therefore, the need for calibration or replacement.

Hysteresis Testing

Hysteresis refers to the difference in readings obtained when the applied force is increased and then decreased. In other words, it is a measure of the load cell's ability to produce the same output signal for increasing and decreasing loads. Hysteresis testing involves applying a load and measuring the output signal. Then, the load is decreased, and the new output signal is measured. The two signals should match, with any significant deviation indicating a faulty load cell.

Repeatability Testing

Repeatability refers to the ability of a load cell to produce consistent output signals when the same load is applied repeatedly. To test repeatability, a known load is applied to the load cell several times, and the output signals are recorded. The readings should be compared, and any significant deviation could indicate a faulty load cell.

Sensitivity Testing

Sensitivity refers to the load cell's ability to produce a change in output signal proportional to the applied force. Sensitivity testing involves applying various loads to the load cell and measuring the output signal. The readings should be compared to the expected values, and any deviation could indicate a faulty load cell.

Stability Testing

Stability refers to the load cell's ability to produce consistent output signals over time. Stability testing involves placing a known load on the load cell and measuring the output signal over an extended period, typically several hours. The readings should be consistent, with any significant deviation over time indicating a faulty load cell.

Conclusion

Testing load cell sensors is a crucial task to ensure accurate measurements and reliable performance. As we have discussed, several parameters should be evaluated during the testing process, including linearity, hysteresis, repeatability, sensitivity, and stability. By following the testing procedures outlined in this article, you can ensure that your load cell sensors perform as intended, providing accurate and reliable readings for your industrial applications.