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Correctly using industrial test weights for equipment calibration is an important step to ensure the accuracy of the measuring equipment. The following is a detailed guide covering the operating procedures, precautions, and environmental requirements.
Preparation before calibration
Confirm the suitability of the weight
Accuracy level: Select the appropriate weight accuracy level according to the requirements of the calibrated equipment. For example:
M1-level weights are suitable for general industrial scales.
F1-level or higher-level weights are suitable for high-precision balances.
Weight range: Make sure the weight range of the weight covers the maximum range and minimum scale value of the calibrated equipment.
Certification and calibration status: Confirm that the weight has been calibrated and is within the validity period. If necessary, check its calibration certificate.
Check equipment status
Make sure the calibrated equipment is in normal working condition and has no obvious damage or malfunction.
Clean the surface of the equipment to avoid dust or foreign matter affecting the measurement results.
Prepare tools and environment
Tools: Prepare gloves (to prevent hand sweat from contaminating the weight), tweezers or clamps (for handling weights with care).
Environmental conditions:
Temperature: Keep within the recommended operating temperature range for the weight and the equipment (usually 15°C to 25°C).
Humidity: Avoid high humidity (<80% RH) to prevent rust or corrosion of the weight.
Vibration: Choose a stable test surface away from vibration sources (such as heavy machinery or traffic).
Calibration process
Placing weights
Handle with care: Use gloves or tweezers to handle weights and avoid direct hand contact to prevent grease or dirt from affecting the accuracy of the weights.
Placement: Place the weights in the center area of the equipment (such as the center of the scale pan) to reduce eccentric loading errors.
Stacking: If multiple weights are required, ensure that the stack is stable and the center of gravity is centered to avoid tilting or sliding.
Perform zero calibration
Record the zero reading of the equipment without loading weights. If the zero deviation is large, adjust the equipment to zero balance first.
Load weights
Add weights in steps according to a certain proportion of the equipment range, such as 20%, 50%, 80%, 100% of the range.
Record the reading displayed by the device after each loading and compare it with the nominal value of the weight.
If the device allows, you can repeat loading and unloading several times to observe its repeatability and linear error.
Unload the weight
Unload the weight step by step in the order of loading, and record the reading after each unloading.
Finally, restore to zero point and check the zero drift.
Data analysis and adjustment
Calculate the error
Compare the device display value with the nominal value of the weight to calculate the error. The formula is as follows:
Error = device display value − nominal value of weight
Determine whether the error is within the acceptable range based on the tolerance range of the device. For example:
Industrial scale: The tolerance is usually ±1 scale value.
High-precision balance: The tolerance may be smaller, please refer to the device manual.
Adjust the device
If the error is outside the tolerance range, adjust it according to the calibration steps in the device manual.
Some devices support automatic calibration, and you only need to enter the nominal value of the weight to complete the adjustment.
Record calibration results
Record the calibration data in the calibration report of the device, including information such as weight, device reading, error value, etc.
Keep the calibration records for subsequent review or traceability.
Precautions
Avoid external interference
Avoid vibration, airflow or other external interference during calibration to avoid affecting the measurement results.
Ensure that the weights and equipment are level.
Prevent weight damage
Do not place the weights directly on a hard surface (such as a metal table). It is recommended to use a soft pad or a special tray.
Avoid collision or falling between weights to prevent surface scratches or deformation.
Regular maintenance
After calibration, clean the weights and store them in a dry, dust-free environment.
Check the weights regularly for rust, scratches or deformation, and recalibrate or replace them if necessary.
Correct use of industrial test weights for equipment calibration requires strict compliance with operating specifications, including selecting appropriate weights, controlling environmental conditions, handling weights with care, and recording calibration data in detail. Through a scientific calibration process, the accuracy and reliability of the measuring equipment can be ensured to meet the needs of industrial production or quality control.
