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  • Small Volume Flow Throug Cell Installation Procedure | Sequoia Scientific
    O ring is a Parker 2 014 The Slider radial O ring is a Parker 2 015 Extra O rings have been provided Figure 1 Small Volume Flow Through Cell for the LISST 100X Step 2 Insert the Slider into the Main Cell until only a small gap is remaining Leaving a small gap will make it easier to install the Spacer in later steps Figure 2 Figure 2 Small Volume Flow Through Cell body pre assembled and ready for installation Carefully insert the assembly into the optical path of the LISST 100X Be careful not to touch the o rings or other parts to the optical windows of the LISST 100X The Slider should be oriented toward the small window and the open end of the Main Cell should be toward the larger window The holes in the Mounting Block should line up with the holes in the LISST 100X Crossbar Standoffs While pressing the Main Cell against the LISST 100X endcap install the Mounting Bolt Spacers and Bolts Tighten bolts to just over finger tight using the Allen wrenches provided with the LISST 100X The screws thread into plastic and over tightening can cause the threads to strip The mounted assembly should appear as shown in Figure 3 Figure 3 Small Volume Flow Through Cell body mounted to LISST 100X Cross Bar Standoff Step 3 Rotate the complete LISST 100X instrument into a vertical orientation such that it is resting on the Endcap Ring with the transmit optics down Figure 4 Figure 4 LISST 100X in vertical position To maintain optical alignment there must be a drop of water between the glass Small Window and the glass cylinder inside the Slider By orienting the LISST 100X vertically it is much easier to get a drop off water to stay in place while the rest of the assembly procedure is completed Using a small eye dropper insert a large drop of filtered water between the Small Window and Slider Figure 5 shows the typical size drop that is required Figure 5 Size and placement of the drop of water is shown It is very important that there be no air bubbles in this drop of water Slowly lower the Slider onto the Small window by inserting the Spacer between the Slider and Mounting Block If needed use a small flat screwdriver to increase the gap large enough for the Spacer to be inserted This will hold the Slider against the small window Excess water will be pushed out leaving only a small film of water between the glass surfaces Care must be taken to make sure that no air bubbles are trapped between the glass surfaces Step 4 After installing the Flow Through Chamber we must now obtain a clean water background before acquiring size distribution data The extra glass cylinder and the drop of water between the Small Window and Slider glass the background scattering may produce additional optical scattering This may cause the clean water background to

    Original URL path: http://www.sequoiasci.com/article/small-volume-flow-throug-cell-installation-procedure/ (2016-02-13)
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  • Bioblock Removal | Sequoia Scientific
    Product LISST ABS Log In Register Home Library Articles Bioblock Removal Bioblock Removal How to remove a BioBlock from a LISST 100X Sequoia March 24 2010 If a BioBlock is ordered together with a LISST 100X the BioBlock is shipped installed on to the LISST 100X However on occasion the user may wish to remove the BioBlock from the LISST 100X and use the instrument without the BioBlock mounted The picture below explains how to remove the BioBlock Click on the picture to enlarge Questions about this application note Email us 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 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

    Original URL path: http://www.sequoiasci.com/article/bioblock-removal/ (2016-02-13)
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  • Getting an RMA number and returning a LISST instrument for service | Sequoia Scientific
    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 New Product LISST ABS Log In Register Home Library Articles Getting an RMA number and returning a LISST instrument for service Getting an RMA number and returning a LISST instrument for service 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 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

    Original URL path: http://www.sequoiasci.com/article/getting-an-rma-number-and-returning-a-lisst-instrument-for-service/ (2016-02-13)
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  • Articles | Sequoia Scientific
    120 22 11 2 433 2 871 2 643 1 217 1 436 1 322 23 10 2 871 3 389 3 119 1 436 1 694 1 560 24 9 3 389 3 999 3 681 1 694 1 999 1 841 25 8 3 999 4 719 4 344 1 999 2 359 2 172 26 7 4 719 5 568 5 126 2 359 2 784 2 563 27 6 5 568 6 571 6 049 2 784 3 286 3 025 28 5 6 571 7 754 7 138 3 286 3 877 3 569 29 4 7 754 9 151 8 424 3 877 4 575 4 212 30 3 9 151 10 80 9 941 4 575 5 399 4 970 31 2 10 80 12 74 11 73 5 399 6 371 5 865 32 1 12 74 15 04 13 84 6 371 7 519 6 921 Angles for LISST 100X VSF measurement in AIR Angles for LISST 100X VSF measurement in AIR Sequoia November 25 2009 The table shows the angles in Degrees for the LISST 100 or LISST 100X VSF measurement in AIR For the angles in WATER click here Type B Type C Ring Size bin Lower Upper Median Lower Upper Median 1 32 0 100 0 118 0 109 0 050 0 059 0 054 2 31 0 118 0 139 0 128 0 059 0 070 0 064 3 30 0 139 0 164 0 151 0 070 0 082 0 076 4 29 0 164 0 194 0 179 0 082 0 097 0 089 5 28 0 194 0 229 0 211 0 097 0 114 0 105 6 27 0 229 0 270 0 249 0 114 0 135 0 124 7 26 0 270 0 319 0 293 0 135 0 159 0 147 8 25 0 319 0 376 0 346 0 159 0 188 0 173 9 24 0 376 0 444 0 409 0 188 0 222 0 204 10 23 0 444 0 524 0 482 0 222 0 262 0 241 11 22 0 524 0 618 0 569 0 262 0 309 0 284 12 21 0 618 0 729 0 671 0 309 0 365 0 336 13 20 0 729 0 861 0 792 0 365 0 430 0 396 14 19 0 861 1 02 0 935 0 430 0 508 0 467 15 18 1 02 1 20 1 10 0 508 0 599 0 552 16 17 1 20 1 41 1 30 0 599 0 707 0 651 17 16 1 41 1 67 1 54 0 707 0 834 0 768 18 15 1 67 1 97 1 81 0 834 0 985 0 906 19 14 1 97 2 32 2 14 0 985 1 16 1 07 20 13 2 32 2 74 2 52 1 16 1 37 1 26 21 12 2 74 3 24 2

    Original URL path: http://www.sequoiasci.com/library/articles/page/6/ (2016-02-13)
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  • Application Notes | Categories | Sequoia Scientific
    the LISST STX as a LISST 100X How Sequoia March 11 2011 Sequoia s LISST STX is an instrument designed for measuring the settling velocities of suspended sediment in situ In order to accomplish this we have fitted Read more Oil droplet size concentration and the LISST 100X May 11 2010 The LISST 100X monitors oil droplets and concentration in the Gulf of Mexico Sequoia May 11 2010 The LISST 100X instrument from Sequoia Scientific Inc has been used intensively by the oil spill research community in the last Read more DeepWater Horizon Oil Spill in the Gulf of Mexico May 3 2010 DeepWater Horizon spill and the LISST 100X Sequoia May 3 2010 The LISST 100X instrument from Sequoia Scientific Inc has been used intensively by the oil spill research community in the last few years to measure the size and concentration Read more New Advances In Measuring Cement Powders September 5 2008 Sequoia September 5 2008 The particle size distribution PSD of a cement powder is important for its complete characterization From the PSD it is possible to compute the surface area of the cement powder which has a close correlation to the rate Read more Next 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 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

    Original URL path: http://www.sequoiasci.com/article_category/application-notes/page/5/ (2016-02-13)
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  • LISST-100X | Categories | Sequoia Scientific
    100 or LISST 100X I get the following error messages Read more compute mean m March 29 2010 Compute mean Sequoia March 29 2010 Function to quickly compute mean diameter in µm from VD data usage diameters compute mean vd type transmission where vd is volume distribution in µl l in n x 32 matrix Read more How to Compute the Mean Particle Diameter from a LISST Volume Distribution March 26 2010 How to Compute the Mean Particle Diameter from a LISST Volume Distribution Sequoia March 26 2010 In the table below the computation of the mean particle size from a LISST volume distribution is outlined Column A is the size class Read more Bioblock Removal March 24 2010 How to remove a BioBlock from a LISST 100X Sequoia March 24 2010 If a BioBlock is ordered together with a LISST 100X the BioBlock is shipped installed on to the LISST 100X However on occasion the user may wish to remove the Read more I Cannot Connect to my LISST 100X February 2 2010 I cannot connect to my LISST 100X Sequoia February 2 2010 Q I cannot connect to my LISST 100X The communication cable is connected to my computer as well as my LISST 100X and the LISST SOP is running but I am unable to talk Read more Previous Next 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 SL LISST 25X FlowControl

    Original URL path: http://www.sequoiasci.com/article_category/lisst-100x/page/5/ (2016-02-13)
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  • How LISST instruments measure the size distribution and concentration of particles | Sequoia Scientific
    detector D and optical transmission sensor P LISST sensors observe scattering of light at multiple angles 32 angles to be precise Inversion of this data leads to a size distribution i e concentration of sediments in 32 size classes The size classes span a 200 1 range of particles 1 25 to 250 2 5 to 500 or 7 5 to 1500 microns The range of sizes within a size class covers a 1 18 ratio of sizes i e 1 1832 200 In addition these systems also measure beam attenuation which is used to de attenuate measured multi angle scattering Thus LISST s have the transmissometer function built in Each ring detector measures scattering into a sub range of angles The ring diameters increase logarithmically from the center The diameters of the ring detectors and the focal length of the receiving lens determine the range of angles over which multi angle scattering is measured This directly determines the range of sizes which can be observed Thus for example the Type B version of the LISST 100 instrument covers the range of angles from 0 1 to 20 which corresponds to sizes from 1 25 to 250 microns The Type C measures over a range from 0 05 to 10 and this corresponds to 2 5 to 500 microns Figure 2 Scattering signatures of 2 distinct sizes of spheres for equal volume concentrations Note magnitude proportional to 1 diameter The total scattering seen by the ring detectors is the sum of many curves such as in Figure 2 each weighted by its corresponding concentration Inverting the total scattering recovers the size distribution Its sum is Concentration The standard path length of the laser beam in water is 5 cm For higher concentration applications path lengths are typically shortened to avoid

    Original URL path: http://www.sequoiasci.com/article/how-lisst-instruments-measure-the-size-distribution-and-concentration-of-particles/ (2016-02-13)
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  • The size resolution of the LISST series of instruments | Sequoia Scientific
    the double integration of scattering over angles covered by a single ring of the detector and covering the size subrange included in a size class To obtain the size distribution first the area distribution is solved for by inverting the above equation Next the volume distribution NV also frequently termed Cn in the literature on sediment transport is obtained by a term by term multiplication of the elements of the area distribution by the mean diameter dm i in the corresponding size class or NV i NA i dm i where we ignore constant multiplier including p In the LISST instruments there are 32 ring detectors which in principle can be used to solve for 32 unknowns That is there should be 32 size classes at which the concentration can be determined The question addressed in this article is Is this really so Does the measurement permit one to distinguish two particles in adjacent size classes More specifically in the type B instruments 1 25 250 micron measurement range where adjacent size classes differ by 18 can two particles barely 18 apart in size be recognized as to be of different sizes Unfortunately the answer is rather complicated If the data are perfect i e noise free then it is possible to resolve the 32 sizes In such a case a simple inverse of the matrix K can be carried out and the area distribution becomes simply NA K 1E This is however hardly ever in fact never done The reason is that the matrix inverse K 1 usually amplifies any noise in the measurement and distorts the resulting estimate of size distribution The property of the matrix that affects the severity of this distortion is called the condition number of the matrix The interested and mathematically inclined reader is referred to two landmark papers that explain the details of the theory Twomey 1977 and Hirleman 1987 For those not conversant in linear algebra an explanation follows The concept that 32 unknowns can be solved for given the 32 angles at which scattering is measured is based on solving algebraic equations Of course they can be solved exactly However when the left hand side of the equation is contaminated by measurement noise one loses information Noise can make two equations identical within the measurement error This is equivalent to the loss of an equation or loss of information As a consequence in practice despite the availability of 32 measurements only about 10 12 sizes may be resolved across the 200 1 size range observable by this type of instruments This conclusion applies regardless of the inversion algorithm employed Only when additional information is available such as knowing the distribution to be narrow or that it has a certain shape can more resolution be obtained To show the performance of the LISST series we display the result of laboratory tests with spheres In a series of steps smaller particles were added to filtered water The particles were added in the following

    Original URL path: http://www.sequoiasci.com/article/the-size-resolution-of-the-lisst-series-of-instruments/ (2016-02-13)
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