Sequoia Scientific


Harmful algae bloom (HAB) instrument

The LISST-HAB is a self-contained, stand-alone instrument system for use on profiling packages, towed and remote vehicle applications, for deployment during a HAB event. The system will continuously measure particle size distribution and concentration, along with the fluorescence of Phycocyanin (Freshwater HAB’s), Phycoerythrin (Marine HAB’s), Chlorophyll and beam attenuation.

Sequoia expects to start taking orders for the LISST-HAB in Q3, with deliveries beginning in Q4, 2019.


  • Complete package based on Small Angle Forward Scattering Laser Diffraction Technology
  • Measures Particle Size and Concentration in 36 Size Classes
  • Integrated with Turner Designs Cyclops-7F fluorometers engineered to detect Phycocyanin (freshwater HAB’s), Phycoerythrin (marine HAB’s), and Chlorophyll
  • Internal programmable datalogger
  • Small and Extended Battery Packs available for self-contained operation
  • USB connection to PC for programming, offloading and real-time size distribution displays
  • Programmable, autonomous data collection
  • Integrated Depth and Fast Response Temperature Sensors
  • Towable or integrated on profiling package or vehicle

Fluorometer Performance
The Turner Designs submersible instrumentation modules used in the LISST-HAB includes single-channel fluorometers for detection of chlorophyll, freshwater and marine HAB’s. Together with particle information from the LISST, this package solution provides a comprehensive picture of a HAB and its development.


Parameters Measured

  • Particle Size Distribution from 1.0-500 μm in 36 size ranges
  • Depth (600 m max depth @ 0.01 m resolution)
  • Temperature @ 0.01°C resolution; Response time: 2.5 s.
  • Optical transmission @ 0.1% resolution
  • Volume Concentration @ 0.1μl/l resolution
  • Beam transmission from 0.3-0.99 (30-99%)
  • Phycocyanin (freshwater HAB’s)
  • Phycoerythrin (marine HAB’s)
  • Chlorophyll

Operating Concentration range

  • Optical transmission from 0.3-0.99 (30-99%)
  • Concentration from ~ 0.5-700 mg/l (particle-size dependent)
Fluorometer ranges
Chlorophyll 0.03 ug/l 0-500 ug/l

Technology (laser diffraction)

  • Small-angle forward scattering
  • 32-ring custom photodiode Ring Detector + 4 large angle detectors
  • 25 mm optical path

Mechanical and Electrical

  • Dimensions: 63.9 cm (25.2”) L x 10.03 cm (3.95”) Ø
  • Weight: 6 kg (13.2 lbs) in air; 2.5 kg (5.5 lbs) in water
  • 600 m depth rating
  • External power input: 12VDC nominal, 8-24 VDC
  • Sampling rate: Up to 1 Hz
  • Current drain at 12 V: 100 mA sampling, 8 mA between samples.
  • Data storage: 1GB (~12,500,000 measurements)
  • Connectors: S/S Impulse MCBH(WB)-3-MP, MCBH(WB)-5-MP, MCBH(WB)-6-MP
  • Laser: 670 nm solid state diode laser
  • Chlorophyll – EX 465 nm, EM 496 nm
  • Phycocyanin – EX , EM
  • Phycoerythrin – EX , EM

Software & Downloads

  • LISST-HAB Product Brochure
  • Accessories


    What is the LISST-HAB exactly?

    The LISST-HAB is a LISST-200X integrated with three Turner Designs fluorometers, sensitive to algae pigments and Chlorophyll. The fluorometers are powered by the LISST-200X, which also controls their sampling. The fluorometer signals are then read by and integrated into the LISST-200X datastream for a unified dataset.