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GENERAL DESCRIPTION
2.3. ABBREVIATIONS
NTU Nephelometric Turbidity Units
FTU Formazin Turbidity Units
USEPA US Environmental Protection Agency
LCD Liquid Crystal Display
RTC Real Time Clock
T.I.S. Tag Identification System
iButton® is registered Trademark of “MAXIM/DALLAS semiconductor Corp.”
Windows® is registered Trademark of “MICROSOFT Corporation”
A light beam that passes through the sample is scattered in all directions. The intensity and pattern
of the scattered light is affected by many variables like wavelenght of the incident light, particle size,
shape, refractive index and color.
The optical system includes a tungsten filament lamp, a scattered light detector (900) and a
transmitted light detector (1800). The microprocessor of the instrument calculates the NTU value from
the signals that reaches the two detectors.
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