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The LISST-Portable is the world's first (and still the only) battery powered portable particle analyzer. It can be used in the field, on a boat, factory floor, or in the laboratory. Using the same small-angle laser scattering principles as our other LISST products, the LISST-Portable analyzes samples in a wet-state and obtains particle size distribution, and particle volume concentration.
The LISST-Portable incorporates a mixing chamber with a pump capability
to keep the largest particles suspended. At only 7 kgs and housed in a
moisture-tight, shock-resistant case, the LISST-Portable is built for
the rigors of transport and field use.
The LISST-Portable includes a rechargeable battery pack, a
microprocessor for control, data processing and data storage, and a
touch panel display for programming and display of the size
distribution of analyzed samples. Data are fully processed on board and
stored as ASCII files, which can subsequently be offloaded to a PC.
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| | | The screenshots below are actual screenshots from the touch panel
display on the LISST-Portable. Click on the images to see them at the
actual resolution (480 x 272 pixels). |
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| | Programing the LISST-Portable is easy. The Main Menu offers four different submenus. The Sequoia button in the bottom left corner will always return the user to the main menu. When the mixer is running the mixer icon lights and the battery icon displays remaining battery power.
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| | In the Display menu, the user has the option to set the backlight timeout (in order to conserve power) as well as the display brightness by dragging the pointer along on the sliding scale.
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 | | In the Setup Menu, the user can choose between six sub-menus. The Avgerage Duration menu allows the user to set the time (in seconds) that averaging takes place. Note that the LISST-Portable gives the user the option to select a shape model for processing the data. The LISST-Portable is the only particle size analyzer in the
world that gives the user such a choice. This option is
selectable on a sample-by-sample basis for maximum versatility. |
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| | Once all the parameters have been set, the user can start measuring samples. During sampling, graphical step-by-step instructions
guides the user through the measuring procedure and instant feedback is
given to the user if the concentration is too high or too low.
Clicking the measure button from the main menu walks the user through the sample procedure step-by-step. The first order of business is to make sure that the mixing chamber is clean and rinse it if it is not.
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| | Once the mixing chamber is sufficiently clean, a clean water background (zscat) measurement is obtained and compared to the factory background measurement. Clicking the update button will cause a refresh of the background measurement if the previous one was not satisfactory. A warning is displayed if the background (baseline) measurement is not of sufficiently high
quality. |
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| | Upon obtaining a satisfactory background measurement the background water can be drained, and the sample introduced into the mixing chamber. The colorbar to the left helps the user decide if the sample needs to be diluted or concentrated in order to obtain the best quality of data. At this stage it is also possible to enter a note regarding the nature of the sample by pressing the grey box.
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| | This enables the keyboard where the sample note can be typed in.
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| | Once the concentration is in range and the optional notes have been entered the instrument will acquire the data, using the averaging duration specified in the Setup Menu. Data are recorded internally at 39 Hz, so averaging over 5 seconds will create an average based on 195 measurements.
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| | As soon as the average has been obtained the size distribution is computed. This takes 45 seconds and in the meantime the user can drain the mixing chamber and clean it, so that it is ready for the next sample.
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| | The size distribution is displayed after processing. Clicking the tabs on the top shifts between four different displays.
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| | In the Cumulative Distribution plot a number of parameters related to the size distribution are shown as well.
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| | The table shows detailed concentration for each size bin.
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| | The stats tab has more detailed information and listing of auxiliary parameters. Numerous parameters are computed and stored with the ASCII file, such
as the voluem concentration in each size bin, mean and median (D50) grain size, D10, D90, D16, and D85
grain size, standard deviation, surface area, optical transmission,
total volume concentration, and the volume concentration in the <64
µm size range.
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Related Links
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Questions about the LISST-Portable? Email us!
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