VLux OilPro

VLux OilPro


5-in-1 MiniSonde for detection and monitoring of dissolved oil in water.


VLux OilPro is the latest advancement in in situ fluorometers from Chelsea Technologies, measuring 5 key parameters in one compact sensor. The miniature, high quality VLux OilPro provides integrated environmental corrections for environmental interference from turbidity & absorbance.


Features & Applications


Chelsea’s miniature, high quality OilPro provides detection and monitoring of dissolved oil in water.


  • 5 key parameters including
    • PAH
    • CDOM
    • Chlorophyll a & c,
    • Turbidity (ISO 7027:1999 compliant)
    • Absorbance
  • Fluorescence automatically correction for absorbance and turbidity
  • Highly sensitive for detection of oil in water at the sub-ppb level
  • Integral biofouling protection using both UV light and copper bezels
  • Compact and robust design, measuring 194 mm (H) x 50 ± 0.05 mm (D)
  • Ideal for standalone fieldwork or system integration including: CTDs, AUVs, ROVs and gliders
  • 6000 m depth rating
  • Integrated logging as standard, battery packs available on request
  • Compatible with Hawk and Watchkeeper for data display in the field


  • Oil spill detection, tracking and monitoring
  • Identification of leaks in underground and subsea pipes
  • Contamination of industrial and process waters
  • Offshore leak detection



VLux In-depth


Why measure CDOM and Chlorophyll as well as PAH?

  • Measuring CDOM and chlorophyll as well as PAH allows the background fluorescence intereference to be separated from the PAH signal, improving accuracy and specificity of PAH measurement.

CDOM – A valuable addition to VLux

  • VLux measures CDOM for corrections but it is also a valuable parameter in its own right. It gives a holistic overview of organic content and when combined with other parameters such as tryptophan, can give an approximation of total organics.
  • In addition, when aromatics combine with halides (e.g. trihalomethanes), they become carcinogenic. This is highly relevant for the water industry – if CDOM is not effectively removed before chlorination, potentially harmful compounds could be added to the water supply.

Why correct for absorbance and turbidity?

  • As the concentration of PAH increases, the compounds themselves absorb light, resulting in a non-linear response of fluorescent signal against concentration.
  • Increased turbidity also has an impact, as light is scattered by particle and other matter in the water. Errors due to turbidity can be significant – adding the correction minimizes errors at even high turbidities.
  • In more challenging and dynamic environments such as rivers and estuaries, the impact of environmental factors cannot be ignored. VLux OilPro measures turbidity and absorbance, applies the correction within the sensor and outputs environmentally corrected data.