Waltron AQUALERT Aqualyzer 3051, Instruction Manual, Page: 17 / 70

Introduction
16
Waltron User Manual
3051 Hardness Analyzer
Figure 2.2: Waltron 3051 inside view with electrical box and liquids box shown.
2.2
APPLICATIONS
The application for the Waltron 3051 Analyzer is for the measurement of Hardness
concentrations in high purity water.
2.3
WORKING PRINCIPLE
Lambert-Beer Law
A colorimetric determination is based on the color-formation after addition of reagents. The
absorbance of the solution is measured at a specific wavelength. The absorbance is related to
sample concentration according to 'Beer's law'.
Lambert–Beer law is an empirical relationship that relates the absorption of light to the properties
of the material through which the light is travelling.
The law states that there is a logarithmic dependence between the transmission (or
transmissivity), T, of light through a substance and the product of the absorption coefficient of the
substance, α, and the distance the light travels through the material (i.e. the path length), ℓ.
The transmission (or transmissivity) is expressed: T = I
1
/ I
0
Electrical Box
Liquids Box