Petrochemical colour measurements of liquids are a vital part of many operations where precise process control and high product quality standards are desired.

Colour measurements are commonly used for number of purposes, including:

   * colour addition control

   * colour after distillation

   * colour in paraffin

   * colour removal control - optimise filtration or ion beds used to strip colour

   * colour avoidance - leak & contamination detection

   * diesel oil inking

   * fuel colour

A common colour scale used in the petrochemical industry is the Saybolt (ASTM) colour scale. The Saybolt (ASTM) colour scale covers the determination of the colour of refined oils such as un dyed motor and aviation gasoline, jet propulsion fuels, naphthas and kerosene, and, in addition, petroleum waxes and pharmaceutical white oils.

The Kemtrak DCP007 in-line photometer can instantly detect minute changes in colour that is beyond the sensitivity of the human eye and will furthermore eliminate operator interpretation errors.

The Kemtrak DCP007 photometer uses an absorbing wavelength to measure minute colour changes in the process medium, while a second reference wavelength that is not absorbed by the process medium compensates for turbidity and/or fouling of the optical windows. The resulting measurements are very accurate with low drift and long-term calibration stability.

Petrochemical colour measurement