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Sequoia is the sole manufacturer of the LISST series laser sediment/particle/bubble/droplet sensing instruments, compliant with the ISO-13320-1 standard. 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.
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The submersible series includes:
- LISST-100X
- LISST-25X
- LISST-SL
- LISST-Deep
- LISST-STX
- LISST-HOLO
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The LISST-100X is Sequoia's workhorse. It delivers the size distribution of suspended sediment in 32 logarithmically spaced size classes. Different models of this instrument cover different range of sizes.
The LISST-100X can be powered via the internal battery (non-rechargeable) for autonomous deployments or externally via a communication cable for real-time display of the size distribution.
A range of accessories exists for the LISST-100X. Used together with these accessories it is possible to use the instrument as a laboratory particle size analyzer. |
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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).
Data are stored internally on the instrument, and up to 6000 measurements can be stored on the instrument.
Some accessories exists for the LISST-25X. |
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The LISST-SL is a stream-lined isokinetic version of the LISST-100X developed for river sediment monitoring. The instrument senses the river current velocity using a pitot tube and adjusts intake velocity to match. The river water is thus pumped through the instrument at the same speed as the water flowing around the instrument, making the sampling isokinetic.
Optics and electronics are enclosed and the data are transmitted via a USGS B-reel to a topside control box containing the batteries. Data are stored on the topside box and displayed in real-time mode on a touch panel display. Please note that a USGS B-reel is necessary to operate the LISST-SL. (What is a USGS B-Reel?)
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LISST-Deep is a deep-sea version of the LISST-100X, capable of operations to 3000 m. While the LISST-Deep shares much of the electronics with the LISST-100X, it has no options for accessories as the LISST-100X because of its radically different mechanical design. |
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The LISST-STX is an extended version of the LISST-100X, with an added Settling Tube (ST stands for Settling Tube). This instrument is designed to perform submerged settling experiments to obtain settling velocities of 8 size classes.
With the settling column removed, the LISST-STX may be used as a -100X, but with less than optimal flow through the sample volume.
When used for settling velocity estimates, the LISST-STX must be securely mounted on a bed frame or a tripod, otherwise the instrument will not deliver reliable data. |
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The LISST-HOLO is a holographic camera manufactured under a license from Plymouth University, UK. The camera was invented by Dr. Alex Nimmo Smith from Plymouth University and Sequoia holds a world-wide license for manufacture.
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This series includes:
- LISST-Portable
- LISST-Streamside
- LISST-Infinite
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The LISST-Portable is the worlds first and only battery powered portable laser particle sizer. Weighing in at less than 5 kgs (10 lbs), it is truly portable and can easily be carried to a sampling site (river, dam, stream, runoff) or simply used in the laboratory as a stand-alone particle sizers.
The LISST-Portable is equipped with a touch-panel display for easy programming and display of data. All data-processing is performed on board the instrument so no post-processing is necessary. The processed data are offloaded as an ASCII file for easy display in Excel, MiniTab etc. |
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The LISST-StreamSide is designed for long-term monitoring applications such as stormwater, and river monitoring. Like the LISST-Portable it is equipped with a touch panel display for easy programming and display of sampling status. Data are processed on board and offloaded as ASCII files. The LISST-StreamSide incorporates and automatic cleaning procedure where the optical surfaces are flushed with clean water at a user-defined interval. Subsequently a clean water background measurement is taken.
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The LISST-Infinite is an auto-dilution instrument designed for use in monitoring river sediments for run-of-river hydro power plants. |
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For further information, use the links at the top of the page or contact us. |
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| Last update: 2/3/2012 |
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|  | | LISST-SOP 5.0 Released |  | LISST-SOP 5.0 for LISST-100X and LISST-Deep released!
Features:
-Batch Processing
-Inversion of randomly shaped particles
-W7 compatible
-Command line batch processing
-Improved serial port communication
DOWNLOAD TODAY | |  | |  |  | HydroVision International 2013
Denver, CO, 23-26 July 2013, booth 337
ICOLD 2013
Seattle, WA, 12-15 August, booth 224
Oceanology International CHINA
Shanghai, China, 3-5 September 2013
35th IAHR World Congress
Chengdu, China, 8-13 September 2013, booth 308
AEG 56th Annual Meeting
Seattle, WA, 9-13 September, booth 31
SPE ATCE 2013
New Orleans, LA, 30 September-2 October 2013, booth 2503
AGU Fall Meeting
San Francisco, CA, 9-13 December 2013, booth 739 | | |
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