Working principle of colorimeter

A colorimeter is a device used in chemistry to determine the absorption or transmittance of a color sample solution and it is working on the base of Beer Lambert's law. The photoelectric colorimeter is a precision instrument intended to be used in the different colorimetric analysis, such as analysis of water, building materials, chemicals, food ingredients, analysis of soil components, textile products, and used in various manufacturing. It is easy to work, robust and precise.

The working principle of colorimeter:

A lamp of low voltage-activated by a constant voltage makes the light source. It passes through a designated color filter and sample solution on the detector (Photocell). The current produced by the photocell is then converted to voltage to display the result on the screen. The switch on the front panel allows being selected in either transmittance (% T) or absorbance (OD).

Simply, the working principle of the colorimeter depends on Beer-Lambert's law which expresses that the measure of light absorbed by a sample is corresponding to the concentration of the sample solution and the length of a light path through the solution.

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