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Kemtak home Kemtrak NBP007 size & concentration Kemtrak TCP007 turbidity measurement DCP007 Colour and concentration DCP007 NIR Kemtrak Applications Data logging

The Kemtrak DCP007NIR uses fiber optics to shine a precisely focused monochromatic (single wavelength) light beam through the process medium and back to a silicon photo-detector.


The attenuation of the transmitted light beam caused by light absorbing substances in the process medium is mathematically described by the Beer-Lambert law.


Applying the Beer-Lambert law (below), the concentration of the sample can be calculated.

A = ε l c




A = absorbance (= - log transmittance)


ε = molar absorption coefficient


L  = optical path length


C = concentration of absorbing species

DCP007 Photometer measurement principle