Sequoia - Suspended Sediment Sensors Default

By: Sequoia  05/12/2011
Keywords: Internal Batteries, Size Distribution

Sequoia is the sole manufacturer of the LISST series laser sediment/particle/bubble/droplet sensing instruments. Some of these instruments deliver the optical volume scattering function (VSF) of interest to optical oceanographers.

The LISST series includes submersible and non-submersible instruments. All employ the small-angle forward scattering principle, also called low-angle laser scattering or laser diffraction.

Submersible Suspended Sediment Sensors: The submersible series includes:

  • LISST-100X
  • LISST-25X
Of these, the LISST-100X is our workhorse. It delivers the size distribution of suspended sediments in 32 logarithmically spaced size classes.  Different models of this instrument cover different rnage of sizes. The LISST-25X is a patented derivative product. It delivers the suspended sediment concentration and  mean size in two size classes (2.5-63 and 63-500 microns). All of the above submersible instruments incorporate a depth sensor. They are powered by internal batteries and store data internally.The LISST-SL is an isokinetic version of the LISST-100X developed for river sediment monitoring. It senses river velocity and adjusts intake velocity to match. Optics and electronics are enclosed. Data are stored on a bridge-top Topside box. Field and Portable Particle/Sediment Size Analyzers:
  • LISST-Portable
  • LISST-Streamside
  • LISST-Infinite

The LISST- Portable is a field or laboratory device for particle size and concentration measurements.  It is also battery operated, easily transported (car, airplane), and autonomous. Data are stored on board.  The LISST-StreamSide is meant for use in shallow streams or rivers. The instrument is designed for placement in a shed. A submersible pump is placed in the stream for delivering water to the instrument. The LISST-Infinite is designed for measuring very high concentrations of sediment, such as occur in rivers. The instrument is placed in a shed and again, water is pumped through it. A clean water source is required for dilution. The instrument performas dilutions if needed.For more information on these instruments, please click on the links at top of this page, or contact us.

Keywords: Internal Batteries, Size Distribution

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Sequoia - Particle Size Analyzers Default

The LISST-StreamSide is meant for use in shallow streams or rivers and is designed for applications where bio-fouling is an issue, or streams are too shallow for instrument submergence, or there exist concerns regarding the safety of the equipment from flowing debris or due to vandalism.