Process color measurements of liquids are critical in maintaining precise process control and meeting product quality specifications. Color changes indicate other process variables such as overheating, dilution ratios and finished product appearances. Photometrically monitoring color measurements inline enables real-time, precise control of color addition, color removal, or color avoidance process automations.

Typically process color measurements are made by extracting samples from the process piping and analyzing them in a lab either visually or using a spectrophotometer. optek colorimeters can immediately detect color changes in process liquids directly in your pipeline. A focused beam of light passes from the lamp through the process medium and is partially absorbed, changing its intensity. This absorbance is color / wavelength dependent, and an indication of the fluid color. The change is then detected by the colorimeter’s detector module, and converted to a signal reading.