Sludge known as waste products, collected during various stages of water treatment, are fluids containing suspended
solid particles in water. Sedimentation velocity of these particles is generally determined using batch settling tests.
This velocity is a determining parameter in dimensioning and controlling the thickeners. Realization and contribution to
the automation of a simple tool for such tests is the subject of this work. The used column (H: 2.30 m, D: 0.20 m) was
provided with infra-red sensors, to quantify the total suspended solid particles (TSS) in water. The automated experimental
device avoids the recourse to the slow and limited conventional gravimetric method. The study of the settled particles
becomes faster and furthermore by automation of the TSS measurements, it is possible to carry out the data acquisition directly
on PC via an adequate interface.