9 REFERENCE
157
9.3
Turbidity Measurement
TW-100 apply transparent light absorption method to calculate turbidity by measurement the
attenuation of transparent light by particulates in sample water.
The transparency of incident light into cloudy water decrease 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.
TW-100 applies 660 nm as wavelength of measuring light to avoid interference of color.
9.4
Color Measurement
The transmitted light measurement method is used in TW-100. This method measures the
level of brownish-yellow in yellow-like colors shown in dissolution and colloidal materials
contained in water at a wavelength of 375 nm using absorptiometry.
Evaluating the color turbidity coefficient
In sample water measurement, read measured color value X
0
when the turbidity coefficient is
set to 0.000, and read measured color value X
1
when the turbidity coefficient is set to 1.000.
Then, measure the sample water using a color meter other than that in this device and
evaluate X'.
Turbidity coefficient =
X'
X
0
X
1
X
0
Summary of Contents for TW-100
Page 1: ...Water Distribution Monitor TW 100 Instruction Manual CODE GZ0000080187H ...
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