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| Suspended Sediment Sensors > LISST-25 |
LISST-25X is a Constant Calibration Sediment/Particle Concentration and Mean Size Sensor to Measure Total Suspended Solids
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LISST-25X marks a generational advancement in the measurement of
suspended sediments. Unlike all prior sediment sensors, optical or
acoustic, the LISST-25X maintains its calibration over a 200:1 range of
particle sizes. A comparison of the LISST-25X and a transmissometer can
be seen in Application Note L10. It is shown that when evaluated with
particles of a broad range of sizes and of several types - manmade
spheres or natural terrigenous, or marine sediments from several
locations - the LISST-25X held calibration to within a factor of 2
whereas transmissometer calibration changed by 2 orders of magnitude
The LISST-25X uses a newly patented concept. It employs
a collimated laser beam to illuminate particles, and a specially shaped
focal plane detectors behind the receiving lens. A comet shaped
detector senses volume concentration of particles, holding calibration
over a 200:1 size range. A second detector measures the area
concentration. A Sauter Mean Size of sediments is provided from the
ratio of these two outputs also.
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