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  • Request Submitted | Sequoia Scientific
    will reply to you as soon as possible You may always contact us by email at info SequoiaSci com with any additional questions you may have Use the drop down menus on the top of the page to explore all the products that we offer For a description of the various accessories available for the LISST instruments please see the Accessories page LISST Portable XR with ultrasonic probe inserted p div style display inline img height 1 width 1 style border style none alt src www googleadservices com pagead conversion 947597371 label L1LXCJOLhF4Qu DswwM amp guid ON amp script 0 div p More in Products Products LISST Portable XR Videos LISST Portable XR Videos Accessories How to Buy Request a Quote Request Submitted Terms Of Sale Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer Models EcoLight S HydroLight Accessories How to Buy Request a Quote Terms Of Sale Support FAQ

    Original URL path: http://www.sequoiasci.com/products/buy/quote/request-submitted/ (2016-02-13)
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  • What is the effect of particle shape on the measurement? | Sequoia Scientific
    is the effect of particle shape on the measurement What is the effect of particle shape on the measurement All computations in the LISST 100 are based on the assumption of the particles being spheres Although there is a wide body of literature in the optical sciences that deals with regular and recently irregularly shaped particles it is of no generalized value A future Application Note will address this issue in more detail However note that the measured scattering being principally the light diffracted around particles responds to particle cross section Spheres being the lowest cross section per unit volume whenever non spherical particles are examined the volume concentration will be overestimated The fractional overestimate depends on the shape itself thus there may be academic interest in estimating this overestimation ratio for selected natural man made particles UPDATE September 2008 Sequoia has published original research on this topic please go to the Technical Papers section in our library and download this paper Agrawal YC Whitmire A Mikkelsen OA Pottsmith HC 2008 Light scattering by random shaped particles and consequences on measuring suspended sediments by laser diffraction Journal of Geophysical Research 113 C04023 More in Support Support FAQ Downloads Register a Product Warranty Info Installation Requirements Responsibilities Warranty Returns Contact Support Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer Models EcoLight S HydroLight Accessories How to Buy Request a Quote Terms Of Sale Support FAQ Downloads Warranty Info Installation Requirements Responsibilities Warranty Register a Product Returns Contact Support Library Articles Technical

    Original URL path: http://www.sequoiasci.com/faqs/what-is-the-effect-of-particle-shape-on-the-measurement-2/ (2016-02-13)
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  • What type of batteries do the instruments use? Where can I get these batteries? How long can the batteries last? | Sequoia Scientific
    made Alkaline batteries except the LISST Portable that uses rechargeable Nickel Metal Hydride NiMH batteries The main batteries used in the LISST 100 and LISST ST are identical with a 15V output and 14A hr capacity This battery can power the instruments for well over 6 months The LISST ST uses an additional rechargeable Lead acid battery to power the door motors Note that the LISST 100 and the LISST ST instruments were both discontinued in 2005 but batteries for these instruments are still available The LISST 100X and the LISST STX both introduced in 2005 uses a 9V custom battery The batteries can be purchased from Sequoia If you would like to wire up your own batteries please contact us for a battery drawing The LISST 25 uses 4 standard 9V alkaline batteries More in Support Support FAQ Downloads Register a Product Warranty Info Installation Requirements Responsibilities Warranty Returns Contact Support Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL

    Original URL path: http://www.sequoiasci.com/faqs/what-type-of-batteries-do-the-instruments-use-where-can-i-get-these-batteries-how-long-can-the-batteries-last-2/ (2016-02-13)
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  • How do the instruments work? | Sequoia Scientific
    Scientific New Product LISST ABS Log In Register Home Support FAQ How do the instruments work How do the instruments work All LISST instruments are based on the small angle scattering method that is also known as laser diffraction Scattering from a laser beam is observed at multiple angles This multi parameter equation is then mathematically inverted to answer the question what size distribution would produce the observed multi angle scattering Details can be found in Application Note 001 More in Support Support FAQ Downloads Register a Product Warranty Info Installation Requirements Responsibilities Warranty Returns Contact Support Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer Models EcoLight S HydroLight Accessories How to Buy Request a Quote Terms Of Sale Support FAQ Downloads Warranty Info Installation Requirements Responsibilities Warranty Register a Product Returns Contact Support Library Articles Technical Papers Standards About Staff News Events PiE Conference 2014 Customer List Newsletter Contact

    Original URL path: http://www.sequoiasci.com/faqs/how-do-the-instruments-work/ (2016-02-13)
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  • LISST | Categories | Sequoia Scientific
    and recently irregularly shaped particles it is of no generalized Read more What type of batteries do the instruments use Where can I get these batteries How long can the batteries last July 10 2013 All instruments use custom made Alkaline batteries except the LISST Portable that uses rechargeable Nickel Metal Hydride NiMH batteries The main batteries used in the LISST 100 and LISST ST are identical with a 15V output and 14A hr capacity Read more How do the instruments work July 10 2013 All LISST instruments are based on the small angle scattering method that is also known as laser diffraction Scattering from a laser beam is observed at multiple angles This multi parameter equation is then mathematically inverted to answer the question Read more More in About About Suspended Sediment Concentration and Particle Sizing Methods Course Staff News PiE Conference 2014 PiE Conference 2014 Customer List Newsletter Contact International Distributors Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST

    Original URL path: http://www.sequoiasci.com/faqs_category/lisst/ (2016-02-13)
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  • Particles in Europe 2014, Esbjerg, Denmark. | Sequoia Scientific
    RETZ and ROFI and determining the fate of biogeochemical components in the marine environment requires information on the differential dispersal of particles of different size Moreover the LISST provides volumes concentrations of discrete particle size classes and this information has added considerably to our understanding of the temporal and spatial scales of flocculation and deflocculation of SPM in response to physical and biological drivers e g Anderson et al Jago et al Fettweis Baeye which in turn determine the ever changing particle size spectra of SPM Such insights allow identification of different modes of SPM transport along a transport path such as washload and bed suspended loads in rivers Agrawal However there are uncertainties about the ability of the LISST to characterize accurately particles of irregular shape heterogeneous composition and variable density This is generally not a significant issue when dealing with transport of marine silicic and carbonate sands which are approximately unidimensional and of fixed and known composition and density Thus an oolite sand grain is highly spherical with an easily definable and measurable volume area and diameter based on the definitions for a sphere A quartz grain is hardly spherical but is sufficiently unidimensional to be treated as a sphere Problems arise with biogenic grains that are whole organisms e g radiolarians or fragments of organisms that are three dimensionally highly variable and depart radically from a sphere but at least generally their composition and density are known In such cases the grains are given a conceptual equivalent diameter which is dependent on the method of size analysis e g sieving laser diffraction image analysis acoustic imaging etc From these methods a mean diameter is often determined even though the value depends on the method used Despite this uncertainty sediment dynamicists routinely use a mean diameter to quantify sediment size The challenge of SPM is that the particles exhibit a huge size range with flocs exhibiting complex three dimensional shapes that are impossible to predict Studies of LISST outputs in comparison with other instruments and technologies e g Winter et al particularly with the LISST HOLO Nimmo Smith et al show that the LISST has limitations especially when confronted with floc sizes that are beyond its designated range Moreover the instrument can be fooled by schlieren effects when deployed in waters with large density gradients Karageorgis and Mikkelsen It is known that bubbles in the water can also confuse the instrument but interestingly Davies et al showed how this can be turned to advantage by using the instrument to characterise oil droplets released in sub sea blowouts Several contributors showed how other optical techniques Nimmo Smith et al Winter Herbst and acoustic techniques Agrawal et al Decrop Felix Fromant et al Hanes Haun et al add to our knowledge of SPM properties especially when deployed in concert with a LISST These presentations showed that optical and acoustic techniques alike have difficulties in characterizing the complex flocs of SPM Studies which employ several different methods simultaneously can resolve some

    Original URL path: http://www.sequoiasci.com/article/particles-in-europe-2014-esbjerg-denmark/ (2016-02-13)
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  • PiE-2016: Particles in Europe | Sequoia Scientific
    will be held in Budapest at the Budapest University of Technology and Economics The University is co sponsoring the conference along with Sequoia Scientific Inc Assoc Prof Sándor Baranya is the local conference co chair in Budapest The 3 day conf will be held between 15 Sept 2016 to 15 Oct 2016 For exact dates and details please return and check for announcements For inquiries please write us Be sure to include PiE 2016 in the subject line The conference will invite select vendors to display their equipment Areas of interest to the conference are Marine sediment transport Hydrological sediment transport Biological studies Maintenance and Contaminated Sediment Dredging River and Reservoir sedimentation Turbine Abrasion Drilling muds Particle Measurement technologies Optics Acoustics of Particles and Flocs Marine Optics Organizing Committee Yogesh Yogi Agrawal Co chair Sequoia Sci Inc USA Sandor Baranya Co chair Univ of Technology and Econ Budapest Hungary Michael Fettweis Royal Belgian Institute of Natural Sciences Brussels Belgium Stefan Haun Univ of Stuttgart Stuttgart Germany Katarina Holubova Water Res Institute Bratislava Slovakia Ole Mikkelsen MacArtney Esbjerg Denmark Chuck Pottsmith Sequoia Sci Inc USA Nils Ruther NTNU Trondheim Norway Slawomir Sagan Inst of Oceanology Polish Academy of Sciences Poland Alex Nimmo Smith Univ of Plymouth Plymouth UK Romaric Varney IFREMER France Last update 20 Nov 2015 More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST Instruments LISST 100X LISST ABS LISST Portable XR LISST Holo LISST Deep LISST StreamSide LISST STX LISST Hydro LISST Infinite LISST VSF LISST STOKES Optical VSF Sensors LISST SL LISST 25X FlowControl Instruments FlowControl Lab FlowControl Sub Radiative Transfer Models EcoLight S HydroLight Accessories How to Buy Request a Quote Terms Of Sale Support FAQ Downloads Warranty

    Original URL path: http://www.sequoiasci.com/article/pie-2016-particles-in-europe/ (2016-02-13)
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  • Sediment Monitoring during Dredging Operations | Sequoia Scientific
    spelled out in the permits For example see guidelines by the US Army Corps of Engineers regulating waterways and EPA here Sequoia offers 3 instruments suitable for this application Two are submersible permitting vertical profiles or towed use The third is a ship board use portable instrument LISST 100X is the most accurate submersible instrument for measuring suspended sediment concentration and additionally particle size distribution PSD PSD is important input in models for predicting pollutant transport It is based on laser diffraction technology LISST ABS is the first major advance in technology for measuring sediments since optical turbidity It measures sediments via very high frequency acoustic backscatter technology It is a small submersible instrument that provides a measure only of the suspended sediment concentration Its attractions it spans a wide range of sediment concentration is more stable in calibration than optical backscatter sensors has a better response to larger grains where optical turbidity is blind is less affected by fouling and is less expensive and easier to use than the LISST 100X LISST Portable XR provides a ship deck truly portable capability to measure concentration and PSD similar to LISST 100X above but it is not submersible It s portability is unmatched worldwide The instrument can be easily carried from ship to ship Only a small water sample is needed Software provides all needed results in a printout The instrument is based on laser diffraction technology It is powered by an internal rechargeable battery and has a data storage computer No external device is needed for data collection Ruggedized so it can be transported by car or as carry on bag on airplanes More in Library Library Articles Technical Papers Standards Our Newsletter Sign up to get the latest news on Sequoia and our products Home Products Product Overview LISST

    Original URL path: http://www.sequoiasci.com/article/sediment-monitoring-during-dredging-operations/ (2016-02-13)
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