
The Kemtrak DCP007 UV photometer measures at two wavelengths. A primary "absorbing" wavelength is used to measure the substance being monitored while a "non absorbing" reference wavelength is used to compensate for turbidity, air bubbles and/or fouling. Fiber optics are used to shine a precisely focused light beam through the process medium and back to a silicon photo-detector. A second photo-detector is used directly on the lamps to compensate for temperature effects and aging. The resulting measurements are very accurate with low drift and long-term calibration stability. 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. 
Where: A = absorbance (= - log transmittance) Ε = molar absorptivity coefficient l = optical path length c = concentration of absorbing species The Kemtrak DCP007 photometer is ideally suited for industrial environments where simplicity, stability and low maintenance is vital.
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