The S461LT probe is used for the optical measure of turbidity in pure and process waters up to 100 NTU. The probe uses the 90° scattered light method.
By turbidity we mean the scattered component of a light beam which is diverted away from its original course by optically denser particles in the
medium e.g. solid matter particles. Measurements are made using the standardised 90° scattered light method in accordance with ISO 7027 / EN 27027. The measuring method is based on the Tyndall effect.
The turbidity of the medium is determined from the amount of scattered light. The transmitted infra-red light beam is scattered by the particles in the medium.
The scattered beams are measured by scattered light receivers which are fixed at an angle of 90 to the transmitted light. The measured scattered light
signals are converted to frequency signals. The frequency signals are assigned to corresponding turbidity units and solid matter concentrations, and appear in the display.
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