Optek AF26 inline VIS/NIR sensor

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The Optek AF26 is a high-precision dual-channel absorption sensor designed for inline operation.

The sensor’s output can be correlated to almost any colour scale including APHA and Hazen. Selected combinations of optical filters make it possible to focus on specific wavelengths to afford suitable adaptation to the application. Typically, one of the two measured wavelengths is used as a reference channel, where it can be used to prevent the influence of particulate, gas bubbles and lamp aging. Additionally, NIST-traceable calibration accessories provide absolute measurement confidence.

The secondary wavelength is designed to compensate the desired light absorbance measurement from any undesired light scattering influence, such as suspended solids, gas bubbles, immiscible fluids or window fouling.

Applications include concentration control of chlorine and chlorine dioxide (gas and liquid), or of metal ions (iron, chromium, copper, nickel, cobalt, manganese, etc.) in the plating industry; for drinking water treatment (APHA colour) and for coloured waste water monitoring (such as in the textile industry).