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  • Sequoia Scientific
    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 Sequoia International Distributors Sequoia Scientific Products and Research for Environmental Science New Product LISST ABS Log In Register Select your application area Energy Hydropower drilling Environmental Stormwater monitoring Freshwater Rivers lakes reservoirs Industry Medical powders Marine Oceans coasts ports Log In Register 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 Sequoia International Distributors News More News PiE 2016 Conference to be in Budapest Hungary February 7 2016 Version 5 1 Software Release Guides Background Collection November 10 2015 New Product Announcement LISST ABS April 9

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  • Products | Sequoia Scientific
    powered portable particle size analyzer It can be used in the field in the laboratory LISST StreamSide The LISST StreamSide is developed specifically for monitoring applications for example sediment monitoring in shallow streams and rivers or LISST Hydro LISST Hydro Particle size analyzer for Hydro Power applications The LISST Hydro instrument system is designed to supplement Sequoia s LISST Infinite Particle Tracer Studies Sequoia Scientific has partnered with Partrac Ltd of Glasgow Scotland to provide particle tracer studies Partrac has developed a method of LISST Holo The LISST Holo from Sequoia is the world s first commercially available submersible Digital Holographic Particle Imaging System The system LISST STX The LISST STX is a submersible field instrument developed for in situ observation of the size dependent settling velocity distribution of suspended LISST VSF The LISST VSF from Sequoia is the world s first commercially available submersible instrument for measuring the volume scattering function LISST SL The LISST SL for StreamLine is a laser diffraction system for measuring sediment properties in freshwater rivers and streams It is not LISST STOKES The LISST STOKES from Sequoia is the world s first commercially available submersible instrument for measuring the depolarization ratio in Optical VSF Sensors The Volume Scattering Function The optical Volume Scattering Function VSF is an inherent optical property of water that is used LISST 25X Stop sediment sampling measure 100 calibration free Measure total concentration and mean particle size at 1Hz LISST 25X marks a generational FlowControl Lab FlowControl Lab is a computer controlled 3 way valve system for use in flow through applications on board research vessels or for dock side sampling The FlowControl Sub FlowControl Sub is a microprocessor controlled fully submersible 3 way valve system for use in flow through applications on profiling platforms EcoLight S EcoLight S ubroutine

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  • Product Overview | Sequoia Scientific
    they are part of the standard Here s an application sorted overview Sediment Observation in Coasts Ports Oceans Rivers Streams Our LISST 100X is the workhorse for these applications A Deep sea version can routinely be used in 10 000 feet deep waters 3 000m The LISST 25 is a lower cost sensor that is the only single parameter instrument for accurate measurement of sediment concentration and mean grain size to be replaced by LISST 10 by 2015 end The newest and lowest cost product LISST ABS uses high frequency backscatter like radar measuring rain but with sound It is expected to replace optical turbidity type sediment sensors in coming years The settling velocity of sediments in water determines how far the sediment can travel This measurement can be made with the LISST ST River Sediment Monitoring Hydropower and Turbines Reservoir siltation LISST Hydro and LISST Infinite serve the river and hydro monitoring communities These are installed at hydro turbine intakes to alert plant operators of high coarse sediment conditions which can damage turbine blades The LISST StreamSide is designed to monitor river sediment loads from a riverbank installation A unique instrument designed as a quantum jump over old river sediment samplers is the LISST SL It is iso kinetic i e it points into the river flow and pulls water in at a velocity that matches river velocity This is important to not bias measurements It is made for studying the transport of sediment in rivers from bridges The instrument is approved by US Geological Survey USGS Go anywhere The world s first hand portable airplane carry on laser diffraction laser particle analyzer is the LISST Portable XR It is the field technicians friend especially popular with oil and gas drilling rigs where they need rapid control of drilling

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  • LISST-100X | Sequoia Scientific
    version without internal battery also exists The folded version is designed to fit in a Chelsea shuttle while the short body version is designed for use with external power A large range of accessories has been developed for the LISST 100X please view our accessories page for a detailed listing The LISST 100X and the LISST Deep were both used intensively after the Deepwater Horizon accident in April 2010 to detect oil droplets and their size and concentration in the waters of the Gulf of Mexico The EPA required the use of LISSTs for measurement of oil droplet size and concentration in the dispersed oil Specifications Parameters Measured Particle size distribution Particle volume concentration Volume scattering function Optical transmission Depth Temperature Sediment size distribution and scattering angles 32 log spaced size classes 1 25 250 or 2 5 500 µm size range equivalent to scattering at 0 08 15º or 0 04 7 5º in water respectively Sediment concentration Range 1 800 mg l 1 for standard 50 mm optical path actual range depends on grain size Resolution 1 mg l 1 Material SSC mg l 98 optical transmission SSC mg l 30 optical transmission D10 µm D50 µm D90 µm SMD µm ISO Fine ISO 12103 1 A2 1 70 1 5 7 41 3 ISO Coarse ISO 12103 1 A4 5 150 4 38 99 10 Whitehouse 20 30 µm glass beads 8 445 19 24 34 24 Sieved sand 75 125 µm 13 810 85 122 175 112 With a 50 PRM in place all SSC values in the table above should be multiplied by 2 With an 80 PRM in place all SSC values in the table above should be multiplied by 5 With a 90 PRM in place all SSC values in the table above should be multiplied by 10 Technology Solid state diode laser 670 nm 1mW 32 ring custom photodiode detector Sample rate programmable up to 25 Hz internally 1Hz saving to data logger Optical path length 50 mm standard bolt on path reduction modules are available for higher concentration environments Mechanical and electrical Dimensions 13 3 cm diameter x 87 cm long 5 25 x 34 25 Weight 11 kg 25 lbs in air 3 6 kg 8 lbs in water 300 m depth rating Serial interface RS232C 9600 baud high speed offload at 115K baud Alkaline battery pack Custom 9V nominal 42 Ah External power input optional 12VDC nominal 10 24VDC CF memory card 128Mb standard 1 600 000 size distributions Battery current drain 146mA 8mA 128µA measuring quiescent sleeping Software Downloads Technical Specifications pdf LISST 100X brochure in pdf format Updated 7th October 2010 pdf LISST 100X Manual Version 5 1 This pdf 4 874 KB is the manual for the new version 5 1 LISST SOP October 2015 pdf Measuring the Volume Scattering Function using the LISST 100 pdf MATLAB processing 1 21 2015 zip EXCEL and MATLAB date converter for LISST 100 and LISST 100X zip LISST 100X

    Original URL path: http://www.sequoiasci.com/product/lisst-100x/ (2016-02-13)
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  • LISST-ABS | Sequoia Scientific
    they are interchangeable How is LISST ABS better than optical turbidity sensors Optical turbidity sensors do not see large grains their sensitivity decreases as 1 diameter LISST ABS sees coarse grains well See for more How is LISST ABS a better sediment sensor than an ADCP The LISST ABS is designed to measure sediments unlike ADCP Care is taken to ensure uniformity of acoustic power correction for attenuation due to beam spreading and water and sediment attenuation No further correction is required by a user The LISST ABS uses 8MHz frequency which significantly flattens its sensitivity to a wide range of sizes in the Mie geometric scattering regime Unlike ADCP s the LISST ABS does not change transmitted acoustic power thus further retaining stable calibration Why is LISST ABS less susceptible to bio fouling The acoustic vibration of the sensor face discourages biological growth Also a small amount of biological growth on the sensor does not affect performance significantly What range of particle sizes does the LISST ABS measure There is no size cut off on either the small or large size end However the LISST ABS measures particles in the 30 400 micron range far better than turbidity or ADCP sensors The plot below shows the response of the LISST ABS as a function of grain size Is acoustic sensitivity like optical turbidity grain size dependent Yes Details are offered here In the Rayleigh region particles smaller than acoustic wavelength sensitivity changes with size but in an opposite way from optics Whereas optical turbidity sensors lose sensitivity for increasing grain size acoustic sensitivity increases till flattening out at around 30 microns for our chosen 8MHz frequency For more What range of sediment concentration does the LISST ABS measure Roughly from about 1mg L to about 60g L For broad sediment size distributions how do OBS and LISST ABS compare This question is answered in an application note 8MHz Acoustics of the LISST ABS produce a superior sensor by way of response to broad size distributions For more Why is the measurement volume at a short and fixed range By choosing a short range attenuation becomes less important and also very high concentrations can be measured e g 60g L for 5 10 micron particles Can I plug the LISST ABS into my CTD The LISST ABS requires 12 volts to operate and outputs attenuation corrected backscatter via analog RS232 and or SDI 12 Input power and all three outputs are supplied via a single 8 pin connector The three different signal outputs and single connector make the LISST ABS compatible with most systems Are individual LISST ABSs interchangeable with equal calibrations Yes their response is equalized at factory for interchangeability What calibration process must I use in order to measure mass concentrations The calibration requires measuring LISST ABS output for one fixed sediment concentration We provide a procedure to automatically convert the measurement to calibration factors Can I buy a mixing chamber system for calibration of LISST ABS Yes

    Original URL path: http://www.sequoiasci.com/product/lisst-abs/ (2016-02-13)
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  • LISST-Portable|XR | Sequoia Scientific
    is require to take measurements or view results The results are stored on the instrument and can be downloaded later to generate a formal report The ease of use combined with the configurable standard operating procedures makes it possible to have non experts consistently and accurately measure particle size A more detailed introduction to the user interface can be found on the LISST Portable XR video page There are two videos related to the user interface One is on How to make a Measurement and the other is an Intro to the Main Menu Measurements are saved on board the instrument and can be viewed on the screen at any time Connect the LISST Portable XR to a PC using the provided USB cable to offload the processed results Using a customizable Excel template a formal size distribution report can be generated and printed or saved as a PDF An example of the Size Distribution Report can be found here The core technology used by the LISST Portable XR is laser light scattering or laser diffraction This method is one of the most common ways of measuring particle size There are many companies using this method including Malvern Horiba Cilas and others The performance of the LISST Portable XR is equal to the laboratory instruments but in a completely portable package The LISST Portable XR is compliant with the ISO 13320 1 standard for laser diffraction measurements Be sure to visit the Frequently Asked Questions and Gallery sections of this page Please email us for price information or to request a demonstration Specifications Particle Size Range 0 34 500 µm size range in 44 log spaced size classes Particle Concentration Range Concentration range 30 1 900 mg l NOTE Actual range is dependent on the grain size and size distribution of the suspended particles See table below for details and examples of concentration ranges based on measurements using ISO particle standards and easily obtained reference materials SMD Sauter Mean Diameter Resolution 1 mg l Accuracy 20 Material SSC mg l 98 optical transmission SSC mg l 75 optical transmission D10 µm D50 µm D90 µm SMD µm ISO Fine ISO 12103 1 A2 12 167 1 5 7 41 3 ISO Coarse ISO 12103 1 A4 52 364 4 38 99 10 Whitehouse 20 30 µm glass beads 85 1063 19 24 34 24 Sieved sand 75 125 µm 135 1938 85 122 175 112 Mechanical and electrical Instrument Dimensions 7 tall x 11 5 deep x 17 5 wide 17 7 cm x 29cm x 44 3cm Shipping Dimensions 31 x 21 x 11 Weight 15 lbs 7 kgs Shipping weight 49 lbs 22 kgs Internal Data Storage 40 000 size distributions Battery life 8 hours nominal depends upon sampling rate Battery Type Lithium Ion 2 batteries at 58Wh each Communications RS 232 9600 baud via built in USB serial interface Software Downloads LISST Portable XR data sheet pdf LISST Portable XR report example pdf LISST Portable XR Manual

    Original URL path: http://www.sequoiasci.com/product/lisst-portable-xr/ (2016-02-13)
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  • LISST-Holo | Sequoia Scientific
    size from the reconstructed images The LISST HOLO has onboard memory for storage of 15 000 holograms An additional external memory module can extend the data logging ability of the LISST HOLO even further The LISST HOLO is configured through an Ethernet connection and a simple web browser interface Specifications Parameters Measured 2MB Hologram containing the interference pattern of all particles in the laser beam Depth Temperature Parameters derived upon hologram processing Particle Size Distribution PSD Standard Deviation of PSD Particle Area Concentration Mean and Median particle size 120 seconds processing time per hologram in MATLAB typical 2 2 GHz PC Sediment Size distribution and concentration range 25 2500µm size range Beam attenuation values between 0 and 4 m 1 Maximum concentration between 0 and 50 mg l depending on grain size Technology Solid state laser diode 658 nm 8 mW 4 4µm pixel size digital camera 1600 x 1200 pixels 2 MB hologram size Hologram capture rate programmable up to 0 2 Hz 1 Hz in short bursts Optical path length 50 mm standard Path reduction modules available for high concentration environments Sampling volume 1 86 cm 3 Maximum current velocity CTD speed during deployment 0 4 m s 1 Mechanical and Electrical Dimensions 13 3 cm 76 7 cm 5 25 30 21 Ø L Weight 7 2 kg 15 8 lbs in air 1 0 kg 2 2 lbs in water 300 m depth rating 32 GB internal solid state drive 32 GB external USB flash drive External Battery life 10 000 holograms for standard 15V 42Ah battery External power input 15VDC nominal 12 16VDC Power drain 200µA 500mA 600mA 880mA sleeping idling laser on laser camera on Weight of EXTERNAL battery case sold separately 8 2 kg 18 lbs in air Software Downloads User s Manual December 2014 pdf Technical Specification Brochure pdf What s New In HOLO Batch December 2014 pdf LISST HOLO Software Windows 64 bit v3 1 LISST HOLO Software Windows 32 bit v3 1 LISST HOLO Software Mac OSX v3 1 How does the LISST HOLO measure size Accessories LISST HOLO Battery pack Replacement Zscat Chamber Replacement 2 meter Communications Cable Clamps Replacement Instrument Stands FAQ How does the LISST HOLO work The LISST HOLO contains a red 658nm laser that emits collimated light into the sample volume The light is scattered by suspended particles The scattered light then interferes with the unscattered portion of the beam The resulting interference pattern is captured by an onboard camera The image captured by the camera is known as a hologram The hologram can be digitally reconstructed to produce an in focus picture of all the particles in the sample volume Information about the particles size shape and position can all be extracted from the hologram How is the LISST HOLO different from an in situ microscope The LISST HOLO is similar to a microscope in that it can produce in focus images of small suspended particles However the benefit of using a holographic system

    Original URL path: http://www.sequoiasci.com/product/lisst-holo/ (2016-02-13)
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  • LISST-Deep | Sequoia Scientific
    LISST Deep Specifications 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 The table below illustrates the main differences between the LISST Deep and the LISST 100X instruments LISST 100X LISST Deep Standard optical path length of 5 cm Two size ranges type B 1 25 250µm or type C 2 5 500µm available Use standard LISST SOP Windows software for programming and offload of data Measures particle size distribution in 32 size classes volume concentration optical transmission and volume scattering function Depth rating 3000 m SeaBird CTD connector for external power from SeaBird CTD Optical path reduction modules PRM s available Internal Battery for power External Digital Input for start stop of sampling External Analog port for logging data from OBS3 Turner Designs Cyclops 7 fluorometer or SeaBird MicroCat C T sensor Accessories for laboratory work e g Full Path Mix Chamber Small Volume Flow Through Chamber Full Path Flow Through Chamber Large Test Chamber BioBlock option to slow down fouling and extend deployments in productive waters 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 Questions about the LISST Deep Email us Software Downloads LISST Deep manual Manual

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