The innoSens 825T turbidity sensor is based on the principle of 90° infrared light scattering and conforms to EN ISO 7027. When the infra-red light from the light source is transmitted through the sample to be measured, it is scattered and its intensity is proportional to the turbidity level. The turbidity sensor is equipped with a scattered light receiver in the 90° direction and analyses the intensity of the scattered light to obtain a turbidity value.