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LISST Instruments >
LISST-Deep
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LISST-Deep
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LISST-Deep (click for larger image)
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The LISST-Deep instrument obtains
in-situ
measurements of particle sizedistribution, optical transmission, and the optical volume scattering function(VSF) at depths down to 3,000 meters. Using a red 670nm diode laser and a custom silicon detector, small-anglescattering from suspended particles is sensed at 32 specific log-spaced angleranges.
This primary measurement ispost-processed to obtain sediment size distribution, volume concentration,optical transmission, and VSF. The LISST-Deep is programmed and operated like a
LISST-100X
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The LISST-Deep is rated to a depth of3,000m and can be ordered as a type B (1.25-250µm) or type C (2.5-500µm) size range.
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LISST-100X (click for larger image)
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If you study the design of the LISST-Deep (see the picture), and compare it with the LISST-100X (shown to the left), it is clear that the mechanical design is very different from that of the LISST-100X. The optical path is more or less in the middle of the instrument, not at the end. This means that no accessories available for the LISST-100X will work with the LISST-Deep, with the exception of communication cables and instrument stands. No BioBlock, mixing chambers or path reduction modules are available for the LISST-Deep.
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LISST-Deep drawing with dimensions (click for larger image)
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Also, because of the much thicker wall of the pressure housing, there is no room for internal battery packs as for the LISST-100X.
The LISST-Deep must be powered externally at all times.
This is typically achieved by connecting it to a CTD, getting power from the CTD. A cable for connecting to a CTD will be included, if the customer supplies Sequoia with the pin-out of the CTD upon ordering. Upon request, Sequoia can furnish a quote for a LISST-Deep external battery pack with cable for connecting to the LISST-Deep.
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The table below illustrates the main differences between the LISST-Deep and the LISST-100X instruments.
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LISST-100X
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LISST-Deep
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Standard optical path length of 5 cm
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Two size ranges; type B (1.25 - 250µm) or type C (2.5-500µm) available.
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Use standard LISST-SOP Windows software for programming and offload of data
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Measures particle size distribution in 32 size classes, volume concentration, optical transmission, and volume scattering function
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Depth rating 3000 m
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SeaBird CTD connector for external power from SeaBird CTD
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Optical path reduction modules (PRM's) available
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Internal Battery for power
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External Digital Input for start/stop of sampling
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External Analog port for logging data from OBS3+, Turner Designs Cyclops 7 fluorometer or SeaBird MicroCat C-T sensor
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Accessories for laboratory work (e.g. Full Path Mix Chamber, Small Volume Flow Through Chamber, Full Path Flow Through Chamber, Large Test Chamber)
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BioBlock option to slow down fouling and extend deployments in productive waters
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The LISST-Deep and the
LISST-100X
was used after the Deepwater Horizon accident in April 2010 to detect oil droplets and their size in the deep waters of the Gulf of Mexico.
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Updated 6/17/2010
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Questions about the LISST-Deep?
Email us!
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|  | | Sequoia visit to Colombia and Ecuador! |  | | Sequoia's Yogi Agrawal and Ole Mikkelsen visited C'Particulas, Sequoia's Colombian distributor 28-30 November 2011. See the pictures on our facebook page! | |  | |  | |
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