What equipment is needed to examine fine wire cloth sieves?

An optical profile projector or a measuring microscope with a magnification of 50x to 100x is recommended to avoid physical contact.

Do I need to measure every single aperture on the sieve?

No, the standard dictates measuring a continuous sequence of apertures (usually 10 to 20) across different selected fields of the mesh to determine the average aperture size.

How are coarse perforated plate sieves measured?

They can be measured directly using calibrated mechanical instruments like vernier calipers, inside micrometers, or specialized taper gauges.

IS 460

: 2000

Test Sieves: Part-III Methods of Examination of Apertures of Test Sieves

CurrentSpecializedTesting MethodMaterials Science · Sieves, Sieving and Other Sizing Methods

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IS 460 Part 3 specifies the methodologies and instruments required for examining and calibrating the apertures of test sieves to ensure they meet the dimensional tolerances specified in Parts 1 and 2. It is predominantly used by calibration laboratories to certify material testing sieves used in civil, mechanical, and chemical engineering.

Test Sieves: Part-III Methods of Examination of Apertures of Test Sieves

Quick Reference Values

magnification for fine sieves50x to 100x (for optical projection)

measurement resolution fine sieves0.001 mm (1 micrometer)

measurement resolution coarse sieves0.01 mm

apertures measured per field10 to 20 consecutive apertures in both warp and weft directions

Practical Notes

Sieves must be meticulously cleaned (preferably using an ultrasonic cleaner for fine meshes) before examination to prevent dust particles from skewing aperture measurements.

For wire cloth sieves, measurements must always be taken in both the warp and weft directions.

Do not use physical probes or stiff gauges on fine wire meshes as they can permanently distort the apertures.