A professional manufacture and sales of various electronic balances, moisture analyzers, viscometers and laboratory instrument manufacturer of weight measure instruments..
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A professional manufacture and sales of various electronic balances, moisture analyzers, viscometers and laboratory instrument manufacturer of weight measure instruments..
Accurate weighing is the key in various laboratories, research centers, and industries such as food production, pharmaceuticals, and manufacturing. Test weights are the main tools used to gain accuracy for the weighing instruments. They verify and recalibrate the scales and balances to maintain the accuracy over time. However, test weights are sometimes mishandled, resulting in inaccurate results. It is crucial to use the test weights correctly and avoid any mistakes to attain the desired precision.
In this article, we will explore the common mistakes while using a test weight and provide guidance on how to avoid them.
Common Mistakes in Using Test Weights
1. Using the Wrong Test Weight Class
One of the frequent mistakes in using test weights is choosing the wrong class that does not match the required precision of the weighing instrument. Test weights are divided into various classes (E1, E2, F1, F2, M1, …) based on specific levels of precision and application. Using a low-precision test weight for a high-precision balance or scale can lead to inaccurate results and calibration errors. It can result in non-compliance with industry standards and regulations.
How to Avoid It: Always assess the precision level and calibration requirements of your instruments before choosing the test weights. Select the appropriate class of test weights that best suit the precision levels and specific application of the instruments.
W&J Instruments provides high-quality test weights of all OIML and ASTM classes to ensure the use of a specific class according to your application and precision.
2. Failing to Zero the Scale
It is essential to zero the scale before placing the weights to get accurate results. However, failing to zero the scale is a common mistake that leads to discrepancies in the calibration process.
How to Avoid It:
• Always remove any pre-existing objects and debris from the scale. Even small particles can change the reading.
• Before placing the weights, delete the previous readings and make sure that the scale is at zero.
3. Overloading the Scale
Overloading the scale with a test weight that exceeds its limit is a serious mistake. It can result in the damage of the scale, leading to compromised accuracy.
How to Avoid It:
• Always check for the maximum capacity of the scale before placing a test weight. When you know the limit, you will not exceed it.
• If you need to calibrate a scale of large capacity, place small multiple weights until you reach the limit. Do not place a single large weight that can exceed the limit.
• Monitor the scale for any signs of overload, such as displaying an error or beeping sounds. If it happens, immediately remove the weight.
4. Improper Handling of Test Weights
All that means for the test weights is the precision. A minor contamination or damage can affect the mass, leading to reduced accuracy. Handling test weights with bare hands can add oil, sweat, and dirt to the weight, which alters its mass. Similarly, damage to the surface of the weight affects the accuracy.
How to Avoid It:
• Always wear gloves while using the test weights.
• Make use of specialized instruments like tweezers and forceps to minimize the drops and damages.
• Clean test weights regularly to remove any contaminations.
5. Using Damaged or Worn-out Weights
Using a damaged or worn-out weight is a frequent mistake that can lead to inaccurate measurements. Even a small damage can change the value of the test weight by altering its mass.
How to Avoid It: Carefully inspect the test weights for any scratches, dents, rust, corrosion, or any other damage before using them. If you see any damage or deformity, replace the weight with a new one to get accurate calibration.
6. Not Calibrating the Test Weights
The precision of the test weights may drift over time due to the environmental factors and undetected wear and tear. Regular calibration is necessary at specific intervals to maintain the accuracy and precision of the test weights over time. Many users do not follow the recalibration schedule, which results in undetected measurement errors over time, leading to inaccurate results.
How to Avoid It:
• Check and follow the manufacturer's recommended schedule for recalibration based on usage and environmental conditions.
• Keep a record of the calibration interval so that you can recalibrate the test weights on time.
7. Ignoring Environmental Conditions:
One of the common mistakes in the use of test weights is not giving attention to the environmental conditions. Environmental factors such as temperature, air current, humidity, and surface vibration significantly impact the accuracy of both scales and test weights.
• High temperature causes expansion of the material while low temperature causes contraction. This changes the mass of the test weights, resulting in measurement errors.
• Air currents from fans, open windows, or vents can cause fluctuations in the values.
• Placing the scale on a vibratory surface also causes variations in the calibration.
How to Avoid It:
• Make sure you are using the test weights in a well-controlled environment with a standard and stable temperature and humidity.
• To minimize the air current, use the scales in a draft-free area or shields if available.
• Always place the weighing instruments on a stable surface that is vibration-free.
Conclusion
You know the importance of the test weights in calibration and measurements. However, the desired accuracy can be achieved only by avoiding mistakes during their use. Common mistakes like selecting the wrong class, failing to zero the scale, overloading the scale, improper handling of the weights, using damaged weights, not calibrating the test weights, and calibrating the weights in an unsuitable environment can all lead to significant variations in the results. You can achieve the best and most accurate results by identifying the common mistakes and following the above-mentioned practices to avoid them.
Whether you are using test weights for W&J instruments or any other trusted brand, the proper and correct use is the key. By avoiding the common mistakes, you can enhance and maintain the accuracy of your equipment to meet the required standards.
We also provide customized electronic balances/ laboratory scales with special functions according to customer needs.
