- September 3, 2018
How To Calibrate Load Cells?
Load cells are capable of accurately measure force, load and are frequently used in weighing systems. It is crucial to ensure that load cells are properly calibrated to provide accurate results in the long run. To achieve this, it is essential for the operators to set a regular calibration schedule. The calibration tasks involve comparing the accuracy of the sensors with the recognised standard. The sensor elements need to be adjusted when the accuracy falls below the standard.
The Need to Calibrate Load Cells
Accurate measurement is the number one priority in any type of applications. Load cells generally provide a superior accuracy and precise measurement results. In reality, load cells may deteriorate over continuous usage and provide less reliable data. Some of the possible causes are sensor age-ing, mechanical impact, electrical faults or loose cables. This implies that routine calibration is necessary to get accurate measurement readings.
The process of calibrating load cells is often complicated and it may lead to significant loss of time and revenue. For this reason, it is important to understand the calibration procedure to assess whether calibration is needed. If you experience situations as listed below, maybe it is the time to send the load cells for calibration.
Significant difference in reading due to different object placements
Although minor difference in reading is expected as the object is moved on the weighing platform, significant difference is not. This is a major indication that sensors settings have deviated from its factory value and need to be re-calibrated. However, ensure that the platform is at a level and the load cell moves correctly to offer an accurate result.
A weight reading that does not settle:
A display reading that does not settle to zero also indicates that calibration is needed. It should be noted that this assessment should be taken on flat and stable surface as vibration can cause the display to move. Although minor, air current can also impact the scale’s performance.
No change in the weight value:
Obviously, no change in the weight value when weights are added to the platforms means that the load cells need to be re-calibrated. This applies only if all the legs of the scale are at level and secure on the floor.
Steps to follow to calibrate your scale:
The calibration procedures may vary depending on the type of the load cells used and manufacturers. There is a general procedure that can be followed which applies to almost all applications, as listed below.
- Start by placing the scale in a stable platform and environment. Please choose area with minimum air currents and vibration levels.
- Move to the calibration mode. Go to the Set Up menu. Choose Platform Setups along with Span Calibration. Following this, you will need to enter a test weight.
- You need to select a test value weight. This weight must be within the scale constraint and approximately 50% of the upper capacity.
- Make sure that there are no items placed on the platform and even the bottom of the scale is not in contact with any object. You need to press the Enter button.
- Follow this by pressing the ‘Calibrate’ button.
- You will next be instructed to place the test object on the scale. The item must be placed at the centre of the platform. After the scale stabilizes, press enter. After the process of calibrating is done, the device will switch to the platform menu.
Following these steps, you can now be sure that your device is functioning correctly. If you wish to know more, feel free to get in touch with us at MeasureX.
MeasureX specialised in delivering customized sensors design to suit a wide range of industrial applications. We also supply sensors with standard parameters without modification. To know more about MeasureX, please contact us on +61 (0) 3 9558 2420 or sales@measurex.com.au. Alternatively, you can also contact us by submitting enquiry through our online contact form.
