The new technology for determining the particle size composition of soils is based on the our own, patented dynamometric method of grain-size distribution analysis using the phenomenon of sedimentation, combines the accuracy of results obtained using the pipette method with the possibility of measuring any number of selected size fractions and a shortened measurement time in comparison to the SHM and PM methods.

The technology allows determining the grain-size-distribution of the ground material below 0.1 mm, based on the result of the measurement of the apparent weight of the float suspended in the suspension. The time of determination of the grain-size-distribution of the test sample is less than three hours, in the grain diameter range of 0.1 - 0.002 mm. In addition, the device allows measuring the total content of fractions smaller than 0.001 mm, any choice of dimensions and the number of fractions measured.

The density of suspension is determined on the basis of apparent weight changes of a float submerged in it. The weight of the float suspended on a thin line, at a given depth in the suspension, is measured with a sensitive piezoelectric dynamometer. The Stokes equation is used to calculate the content of soil fractions with equivalent diameters in the range of 0.001 to 0.1 mm.

Digital transmission of results from the dynamometer, the temperature sensor and measurements of the distance defining the depth of immersion of the float to the computer enables calculations of particle size composition to be performed automatically. A high level of repeatability of the results and satisfactory compatibility in relation to the reference pipette method are noted.

Compared to the previously used sedimentation methods developed technology has significant advantages