What are the common errors in calibration and inspection of load cell?

In the process of pre-calibration and regular inspection of load cells, some common mistakes may occur. Understanding these errors is helpful to take preventive measures to ensure the effectiveness of calibration and inspection. The following are some common mistakes and their effects.

A. Common errors in pre-calibration

1. Incorrect selection of calibration equipment: using standard equipment with insufficient accuracy or without calibration may lead to inaccurate calibration results.

Solution: Always use certified equipment with higher accuracy than the calibrated sensor.

2. Ignore the influence of environmental conditions:

The changes of environmental factors such as temperature and humidity are not considered in the calibration, which may affect the output characteristics of the sensor.

Solution: Adjust the laboratory environment to standard conditions before calibration and keep it stable.

3. Improper selection of calibration points: only one or two points in the calibration range can be calibrated, which can not fully reflect the linearity and repeatability in the whole measurement range.

Solution: Cover the whole range in the calibration process, especially select multiple calibration points in the low, medium and high areas.

4. Insufficient skills of operators:

The operator is not familiar with the calibration procedure or lacks experience, which may lead to misoperation.

Solution: Train operators to ensure that they understand and follow the correct calibration process.

5. Incomplete or inaccurate recorded data:

During the calibration, all necessary data were not recorded in detail, or the recorded data were wrong.

Solution: Establish a detailed recording system, including calibration date, equipment used, calibration points and readings.

B. Common mistakes in regular inspection

1. No reasonable inspection plan has been made:

The proper inspection period is not made according to the frequency of use and working environment of the sensor.

Solution: Based on the working environment and usage of the sensor, reasonably arrange the time interval of regular inspection.

2. Neglect of appearance inspection: Neglect of careful inspection of appearance, such as whether the connecting wire is intact, whether the sensor surface is damaged, etc.

Solution: The physical state of the sensor should be carefully observed during each inspection, and the potential problem function should be found in time.

3. The test is too simple: only basic functional tests, such as zero drift check, are done, while more complicated performance verification, such as linearity and repeatability, are ignored.

Solution: Conduct a comprehensive functional test to ensure that all performance indicators of the sensor meet the requirements.

4. Ignore the impact of environmental change:

The change of environment around the installation location (such as temperature, humidity, vibration, etc.) is not considered during inspection, which may affect the stability of the sensor.

Solution: Evaluate the environmental conditions of the installation location and take necessary protective measures.

5. Maintenance is not in place: regular cleaning, lubrication or other necessary maintenance work is not carried out as recommended by the manufacturer.

Solution: Strictly follow the maintenance guide provided by the manufacturer to ensure that the sensor is in good condition.

6. Failure to handle in time:

After the problem was discovered, no immediate action was taken to fix it, resulting in a minor problem turning into a major failure.

Solution: Once the problem is found, you should respond quickly and make necessary repairs or replace parts.

By identifying these common errors and avoiding them in actual operation, the quality of pre-calibration and regular inspection of load cell can be greatly improved, thus ensuring its long-term stable and reliable operation.