VLux AlgaePro


6-in-1 algae biosonde suitable for algal bloom monitoring and characterisation


VLux AlgaePro is the latest advancement in in situ fluorometers from Chelsea Technologies, measuring 4 algal groups with integrated environmental corrections for absorbance and turbidity in one compact sensor. The absorbance measurements also provide a correction for CDOM interference and increase dynamic range by a factor of 20x.


Features & Applications


Chelsea’s miniature, high quality AlgaePro provides integrated environmental corrections for algal bloom monitoring and characterisation.


  • Turbidity and algae measurement including:
    • Chlorophyll a & c
    • Chlorophyll b & c
    • Phycoerythrin
    • Phycocyanin
    • Turbidity (ISO 7027:1999 compliant)
  • Fluorescence automatically correction for absorbance and turbidity
  • Absorbance for each fluorescence excitation wavelength
  • Integral biofouling protection using both UV light and copper bezels around windows
  • 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


  • Harmful algal bloom monitoring
    • Finfish and shellfish aquaculture
    • Bathing waters
  • Algal bloom monitoring
    • Catchment monitoring
    • Environmental health
    • Water treatment
  • Industrial monitoring of algae
    • Identification of contamination in bottled water production
    • Algae population assessment in bioreactors
  • Research into primary productivity and algal population characterisation



VLux In-depth


Why measure multiple algal pigments?

  • Different algal species have different induction spectra depending on their specific pigment composition.
  • AlgaePro features 4 different wavelengths, designed to excite different algal pigments. This allows many different types of photosynthesizing organisms to be detected, including red algae, diatoms and cyanobacteria. Studying the relative concentrations of each pigment can provide information on the type of species present within the algal community.

Why correct for absorbance and turbidity?

  • As the concentration of chlorophyll and algal pigments increases, the compound itself absorbs 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 AlgaePro measures turbidity and absorbance, applies the correction within the sensor and outputs environmentally corrected data.