Working principle of Nephelometric Turbidity meter

Generally most of the Portable and Bench type Turbidimeter operates on the nephelometric principle of turbidity measurement.

Working Principle of Turbidity meter

The optical system (Ref Figure) includes a tungsten-filament lamp, a 90° detector to monitor scattered light and a transmitted light detector. The instrument’s microprocessor calculates the ratio of the signals from the 90° and transmitted light detectors. This ratio technique corrects for interferences from color and/or light absorbing materials (such as activated carbon) and compensates for fluctuations in lamp intensity, providing long-term calibration stability. The optical design also minimizes stray light, increasing measurement accuracy. Working Principle of
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