What are calibration weights used for?
Calibration weights are used to check the accuracy of balances and scales by providing a known weight reference. They help ensure that measurement instruments are providing accurate and reliable readings.
What materials are calibration weights made of?
Calibration weights are typically made from materials like stainless steel, brass, or aluminum, chosen for their stability, durability, and resistance to corrosion. Higher precision weights may also be made from platinum or other high-density materials.
How are calibration weights classified?
Calibration weights are classified into various accuracy classes (such as E1, E2, F1, F2, M1, M2, and M3) according to international standards like OIML (International Organization of Legal Metrology). Each class has specific tolerance levels that determine its use in different precision applications.
How often should calibration weights be recalibrated?
The frequency of recalibration depends on the application, frequency of use, environmental conditions, and regulatory requirements. Generally, weights used in high-precision or regulated industries should be recalibrated annually or as recommended by the manufacturer.
What are some common issues with calibration weights?
Common issues that can arise from using calibration weights include:
- Contamination – with improper handling, weights can become contaminated. To prevent this, you should use the correct PPE, remove dust or debris with a soft brush and store them correctly after use.
- Corrosion – harsh substances or high temperatures can lead to corrosion. Ensure you use compatible substances and the maximum temperature when using calibration weights.
- Physical damage - such as scratches or dents can occur during improper handling. You should take extra care to avoid these damages.
- Wear & tear - from frequent use can occur.
These issues can affect the weight’s accuracy. Regular inspection and proper handling are essential in minimizing these issues from occurring.
What is the difference between internal and external calibration of balances?
Internal calibration refers to balances that have a built-in calibration mechanism that uses an internal weight for calibration, making it convenient and quick. External calibration requires the use of external calibration weights to manually calibrate the balance.
Are calibration weights traceable to national standards?
High-quality calibration weights are traceable to national or international standards, meaning their accuracy can be verified against a recognized reference, ensuring confidence in measurement results.
Why is it important to use the correct class of calibration weight?
Using the correct class of calibration weight ensures that the calibration is appropriate for the level of precision required. Using a lower-class weight for a high-precision balance can lead to inaccurate calibrations and unreliable results.