HORIBA TW-100® Drinking Water Analyser applies transparent light absorption method to calculate turbidity by measurement the attenuation of transparent light by suspended particulates in sample water. The transparency of incident light into loaded water decreases by the reflection and scattering. The decrease is proportional to the concentration of particles in water. This phenomena is similar to Lambert – Beer Law, which is the relationship between light and color.
The transmitted light (wavelength of 375 nm) measurement method implemented in the TW-100® Drinking Water Analyser allows measuring the changes in water colours within the brownish-yellow range by absorptiometry at a .
Residual Chlorine Measurement
Residual chlorine is active chlorine remaining in water from the result of tap and pool water disinfection or chlorine treatment for sterilization and deodorization in the food industry. In water, chlorine (Cl2), hypochlorous acid (HClO) and hypochlorite (ClO-) are balanced according to a pH value and the compound formed from these three is called residual chlorine. Therefore, if a reduction reaction occurs in an electrode soaked in residual chlorine solution, it will generate a current flows in the external circuit. This current is proportional to the amount of residual chlorine in solution, so you can measure the concentration of residual chlorine in sample water by measuring this current.
When measuring pH, the meter must be calibrated using a standard solution. There are several kinds of standard solutions. For normal measurement, two standard solutions (with a pH of 7 and 9) are sufficient to accurately calibrate the meter.
Conductivity is an index that expresses the ease with which electric current flows through a material. Conductors are categorized either as electron conductors, such as metals and
other substances which use free electrons to conduct electricity. Or ion conductors, such as electrolytic solution or fused salt, which use ions to conduct electricity. This section deals with the kind of conductivity that pertains to ions, especially the conductivity of electrolytic solution that uses water as the solvent.