Verification of sieves is a critical process that ensures the accuracy and reliability of sieve measurements in various applications, such as quality control, material separation, and soil analysis. This process involves rigorous testing and calibration to ensure that the sieve meets specific standards and performs as expected.
Summary of Verification Process: Verification of sieves typically involves comparing the sieve's performance against a master set or standard reference materials (SRMs) traceable to the National Institute of Standards and Technology (NIST). This comparison helps determine if the sieve's openings are within the acceptable tolerances specified by standards like ASTM E11.
Detailed Explanation:
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Master-Matched Sieves:
- These sieves are selected and measured to match a master set maintained by the manufacturer. This ensures uniformity and repeatability, especially crucial when multiple sieve sets are used across different locations.
- The verification process for these sieves includes meeting ASTM E11 standards and performance testing with NIST traceable SRMs to correlate with the master set.
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Performance Testing with SRMs:
- ASTM E2427 outlines methods to check the performance accuracy of working sieves using SRMs or user-prepared reference samples. SRMs, often glass beads, are measured on equipment traceable to NIST.
- The sieve's accuracy is determined by passing the SRMs over both the working sieve and a calibration grade reference sieve. Calculations based on the results determine the working sieve's accuracy.
- SRMs can also measure the average aperture size, and monitoring these results over time helps determine when a sieve is too worn for continued use.
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Calibration Sieves:
- Calibration sieves are more precise, with more openings and wires measured, providing a higher level of statistical accuracy (99.73% confidence level).
- These sieves are used as references to calibrate working sieves, ensuring the highest level of accuracy in sieve measurements.
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Re-verification and Internal Quality Control:
- Re-verification is a process similar to initial verification but is performed on used sieves to check their continued performance.
- Both initial verification and re-verification can be part of an internal quality control/quality assurance program, ensuring ongoing accuracy and reliability of sieve measurements.
Conclusion: Verification of sieves is essential for maintaining the integrity of measurements in various industries. By adhering to strict standards and using SRMs, the process ensures that sieves remain accurate and reliable, contributing to the quality and performance of the materials and products they help measure.
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