LABORATORY TEST SIEVES - KNOW ABOUT STANDARDS AND CALIBRATION

LABORATORY TEST SIEVES - KNOW ABOUT STANDARDS AND CALIBRATION

In the industries where particle size analysis is a crucial step the engineers must take for production, laboratory test sieves pray a pivotal role. The raw material that is to be used in particle form has a serious bearing on how the finished product turns out in quality. Particle size determines the rate of chemical reaction, the packing and density of material, sedimentation tendency, etc. It is, therefore, of utmost importance that particle size analysis be carried out with utmost care. Thus, laboratory test sieves which are standardized and properly calibrated are used to ensure that the particulate raw material being fed into production process are the right size. This article is all about laboratory test sieves – know about standards and calibration.

Test sieve standards There are two prevalent standards for laboratory test sieves that are referred to while carrying out particle size analysis:  

B.S410/I.S.O.3310 ASTM E 11 1993

Both the standards revolve around the aperture size and related parameters of a laboratory test sieve, and both standards allow some amount of tolerance away from the rated aperture size printed on a sieve. If the deviation is within the limits of tolerance stipulated, the sieves are said to be compliant with standards.

In order to understand how sieve standards, work, it is necessary to understand how aperture size is measured. Contrary to common belief, all the apertures in a laboratory test sieve are not the same size. Aperture size is measured along the line passing through the centre of an aperture along both warp and weft directions.

Standards stipulate presence of a minimum number of apertures for standard sieves of all diameters, and the number of these apertures is different for compliance and inspection sieves, and for calibration sieves. For example, for a sieve diameter of 200mm, according to these standards, the values would be as follows:   

Nominal aperture between 900 and 800 Number of apertures 2x40 in both directions for inspection and compliance Number of apertures 2x80 for calibration

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If your laboratory test sieve is 200mm in diameter and checks all the boxes as mentioned above, then the sieve is compliant with the standards.

Calibration of a laboratory test sieve completely depends on the output particle size you wish to obtain. Considering how some tolerance is allowed by standards in the aperture size, selecting the exact size of sieve for desired particle size may let bigger particles through. It is recommended to calibrate the sieve for nominal aperture sizes smaller than the required particle size.

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