Explore particle
sensing with Sequoia
Discover submersible and field instruments for measuring particles and their properties.
Submersible and Field Instruments for Measuring Particles and their Properties.
Sequoia Scientific has been building instruments for making measurements in the marine environment since 1995.
LISST-Holo2
Record holograms of suspended particles for later image reconstruction and analysis. LISST-Holo2 supports studies of flocs, plankton and sediment, with a rechargeable internal battery and onboard storage. Its current design succeeds the original LISST-Holo while retaining the principle of imaging particles within the illuminated water volume.
LISST – Tau High-Precision Transmissometer
LISST-Tau is a high-precision transmissometer for underwater vehicles, profiling packages, CTDs, and other systems. With high-quality optics and a carefully selected LED source, it transmits a collimated beam through the water, and…
LISST – Black
The LISST-BLACK has been developed for oil spill applications and is a self-contained stand-alone instrument for use on profiling packages, towed and remote vehicle applications, for deployment during and after an oil spill event.
LISST – 200X
LISST-200X is a submersible laser diffraction instrument that measures the size distribution and concentration of particles suspended in water. Its built-in logger records measurements for later download, and its depth and temperature sensors support profiling.
LISST-Portable|XR
The LISST-Portable|XR is the world’s first and only battery powered portable particle size analyzer. It can be used in the field, in the laboratory or on the factory floor.
LISST – Deep
The LISST-Deep instrument obtains in-situ measurements of particle size distribution, optical transmission, and the optical volume scattering function(VSF) at depths down to 3,000 meters.
Hyper-a hyperspectral absorption instrument
Measure absorption by dissolved and suspended material directly in the water.
LISST – VSF
The LISST-VSF from Sequoia is the world’s first commercially available submersible instrument for measuring the volume scattering function (VSF) of water in situ with some polarization discrimination capability. The LISST-VSF covers…
Hyper-bb hyperspectral backscatter instrument
Measure how particles in water scatter light back across a range of wavelengths.
LISST-Logger submersible datalogger
Bring compatible sensor outputs into one underwater logging system.
LISST-RTSSV particle settling instrument
Observe particle size, concentration and settling behaviour together.
Sequoia – accessories
A range of accessories for Sequoia instruments, including deployment cages, batteries, flow tubes, mixing chambers, anti-fouling bio-blocks, cables, test chambers, custom optical paths, custom enclosures, etc.
More from the Sequoia range
LISST-HAB harmful algae bloom instrument
Combine particle measurements and fluorescence when studying harmful algal blooms.
LISST-OST optical sediment trap
Track changes in diffuse optical transmission and attenuation with LISST-OST.
LISST-SL2 river sediment instrument
Collect sediment measurements with an isokinetic sampling system for rivers.
LISST-pH particle and pH sensor
Measure particle properties alongside pH in a combined underwater package.
Sequoia non-rechargeable battery packs
Choose an alkaline subsea power pack for deployments where rechargeable power is unsuitable.
Sequoia optical scattering and VSF sensors
Choose an optical measurement around the scattering information your study needs.
Sequoia rechargeable battery packs
Power subsea instruments with a rechargeable battery pack selected for the deployment.