Kemtrak DCP007 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.
A = ε l c
A = absorbance (= - log transmittance)
Ε = molar absorptivity coefficient
l = optical path length
c = concentration of absorbing species
Kemtrak DCP007 photometer is ideally suited for industrial environments where simplicity, stability and low maintenance is vital.