Turner Designs


The PhytoFlash™ is distinct from other variable fluorescence instruments on the market in that it is the first solid-state instrument capable of variable fluorescence measurements on natural concentrations of phytoplankton. The solid-state platform allows for a much wider range of uses due to the small size, power efficiency, more stable components, and lower price point.



  • Red PhytoFlash™ version specific to cyanobacteria available
  • Real time in situ measurement of phytoplankton photosynthetic parameters
  • Operate in three different modes
  • Integrate with a CTD
  • Self-contained with internal datalogging
  • Laboratory mode
  • Extended battery life – 30 second intervals for over 35 days
  • Large internal data logging memory – 10,000 points


  • Indicator of nutrient status Precursor for the onset of harmful algae blooms Oceanographic, estuarine, limnological and riverine studies Active Fluorescence

PhytoFlash Measured Parameters
Fo Minimum fluorescence
Fm Maximum fluorescence
Fv Variable fluorescence (Fm – Fo)
Fv/Fm (yield) Maximum quantum yield of photochemistry in PSII
Blank Calculated blank value used in calibration
Response Curve Available during laboratory mode

PhytoFlash Physical Specifications
Minimum Detection Limit 0.15 µg/L
Linear Range 0-100 µg/L
Weight in Air 3.25 lbs (1.47 kg)
Weight in Water 1.01 lbs (0.46 kg)
Length x Diameter 12″ x 3″ (30.5 cm x 7.6 cm)
Temperature -2 to 50 degrees C
Depth 600 meters

PhytoFlash Electrical Specifications
Power Requirements < 1 W typical
Supply Voltage Range 8 – 30 VDC
Detector Photodiode
Light Source Light Emitting Diode

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