Gilson Verification of New Test Sieves and Screen Trays

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Verification is performed on conventional Compliance sieves to produce ASTM and ISO Inspection and Calibration Test Sieves. Each sieve is individually measured on an NIST traceable optical comparator prior to shipment. The computerized system automatically scans the sieve, performs a statistical analysis and provides required documentation appropriate to the grade desired. Periodically returning sieves or screen trays to Gilson for Re-Verification assures continued compliance with standards.

Inspection has a specified number of openings measured in each sieve after the cloth is mounted in the frame. There is a 99% confidence level that the standard deviation of these openings is within the maximum allowed by ASTM. Inspection Sieves are a good choice in applications where accuracy and repeatability are critical. Each Inspection Sieve consists of a Compliance Sieve with added Inspection Sieve Verification service.
Calibration has about twice as many openings measured as Inspection Sieves. The higher number of openings measured on each sieve increases the confidence level to 99.73% that the standard deviation of these openings is within the maximum allowed by ASTM. Calibration Sieves should be used in applications where a very high degree of accuracy is required. Each Calibration Sieve consists of a compliance sieve with added Calibration Sieve Verification service.

Compliance has manufactured with wire cloth that has been inspected and measured in roll or sheet quantities prior to being cut and mounted in the individual sieve frames. Opening sizes are not measured in individual sieves. Each Compliance sieve is supplied with a certificate of manufacturing compliance, but no statistical documentation is given. Compliance sieves are designed for applications where a basic, reliable degree of accuracy and repeatability are sufficient. All new sieves and trays are Compliance inspected and include a Certificate of Compliance.

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