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Ensuring the long-term accuracy and stability of Laboratory Calibration Weights is an important task in both laboratory and production environments. Here are a few ways to ensure their long-term accuracy and stability:
Calibration weights need to be calibrated regularly to ensure that their accuracy remains within the standard range. The laboratory should set a calibration cycle, which is determined by the frequency of use of the weights and the working environment. Usually, the calibration cycle is annual or adjusted as needed. When calibrating, a certified metrology laboratory should be used for inspection and ensure that the weights comply with national or international metrology standards (such as ISO, OIML, etc.).
The accuracy of weights is affected by environmental conditions, especially temperature, humidity and air pollution. To ensure that the weights maintain stable accuracy over a long period of time, they should be stored in a temperature and humidity controlled environment. Generally speaking, the temperature should be kept at around 20°C and the humidity should be controlled between 40% and 60%. The storage environment of the weights should be checked regularly to prevent changes in quality due to environmental factors.
Proper storage is an important factor in maintaining the accuracy of weights. Weights should be stored in a dedicated, dry, dust-free storage box or shockproof packaging to avoid physical impact, contamination or corrosion. Weights should be kept away from direct contact with the outside environment, especially with hands, as oil, sweat or dust may affect the quality of the weights. Clean the surface of the weights regularly, especially after contact, with a soft, dust-free cloth.
During transportation and use, weights may be subject to mechanical shock and vibration, which may affect their accuracy. To avoid this, ensure that appropriate protective measures are taken during transportation and handling, such as using shockproof packaging and cushioning materials. When using weights in the laboratory, avoid violent shaking, collisions, etc. to prevent deformation or surface damage.
Weights may be corrosive to gases in the environment (such as oxygen, moisture, salt, etc.), especially steel weights. In high humidity or corrosive environments, weights should be treated with anti-corrosion treatments, such as nickel or chrome plating. In addition, weights should be kept away from chemicals or dust that may cause contamination, and should be avoided from long-term exposure to environments that may affect their accuracy.
In order to avoid direct contact with the weights and reduce contamination from hand stains, grease, sweat and other substances, it is recommended to use anti-contamination gloves for operation. This can effectively reduce the contamination of foreign substances on the surface of the weights, thereby maintaining the accuracy of the weights.
Extreme temperature fluctuations can affect the physical properties of the weights, resulting in changes in mass. For example, high temperatures may cause the weights to expand, while low temperatures may cause them to shrink. Therefore, weights should be kept away from long-term exposure to extreme temperatures. They should be stored in a place with stable temperature and try to avoid direct exposure to sunlight or heat sources.
Weights should be visually inspected regularly to check for cracks, corrosion, wear or other physical damage. If any abnormality is found in the weights, they should be handled immediately, such as calibration, repair or replacement.
Choosing high-quality weights that meet international standards is also key to ensuring their long-term accuracy and stability. When purchasing, you should choose reputable brands and suppliers to ensure that the materials, design and manufacturing processes of the weights meet strict metrological standards. Higher-quality weights generally have better stability and longer service life.
Establish a comprehensive record and tracking system to ensure that the use of each weight can be tracked. Record the calibration history, usage environment, maintenance and care of the weights to help analyze whether they need to be recalibrated or replaced.
Weights should not be used repeatedly under excessive conditions, especially when high loads or extreme operating conditions are involved. Long-term excessive use may affect the accuracy of the weights, so they should be replaced when necessary.
Laboratories with conditions can choose to send weights to third-party certification agencies for verification and certification on a regular basis. Third-party certification can provide additional assurance that the weights meet national or international standards and can maintain accuracy over a long period of time.
Through the above methods, laboratories can effectively ensure the long-term accuracy and stability of calibration weights, thereby providing guarantees for accurate calibration and daily measurements of laboratory equipment.
