A turbidity meter performs an optical analysis where the suspended particles in a liquid. It uses a light source and a light detector (photocell) fixed at a right angle to the original beam. The light source of the instrument, is a lens that forces and conducts the light beam through the liquid, and the photocell, is the photoelectric device in charge of recording a modification of its resistance when it detects an increase in light, that is, it detects and estimates the amount of light radiation that has been dispersed.
Turbidimeters work by measuring suspended particles with a beam (beam source) and a light detector fixed at 90° from the original beam. The density of the particles is a function of the light reflected by the particles suspended in the detector. The amount of light reflected for a given density of particles will depend on the properties of these particles such as their shape, color and reflectivity. State-of-the-art equipment uses a laser to measure light dispersion at 90° and 360° around the sample, providing high optical accuracy, with fast results and greater reliability of the equipment.