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LISST-25

Sequoia Scientific, Inc. announces the availability of a new instrument designed to record the total suspended particle area and volume concentrations, and the Sauter mean diameter of suspended particles. Based on laser diffraction technology, the LISST-25 provides the sediment transport community with a new tool. The main advantage of the LISST-25 is that, unlike transmissometers, optical backscatter sensors, or single-frequency acoustic sensors, the LISST-25 has a constant calibration over the covered range of particle sizes. The LISST-25 does not give the particle size distribution.

The technique used by the LISST-25 sensor differs from other turbidity sensors. It measures the forward scattered light from a collimated laser beam using only two specially designed silicon detectors. These measurements are used to obtain the Total Volume and Total Area of particles directly, bypassing inversion of data as is done in the LISST-100 to obtain the particle size distribution. From the ratio of total volume and area, the Sauter Mean Diameter is obtained.

The LISST-25 is a self-contained instrument that includes optics and electronics, datalogger, and a battery pack. It is designed for ease of use and ruggedness. The on-board data logger allows for simple programming of sampling schedules and can be connected to a PC via an RS-232 port. The depth rating is 300 meters. The instrument covers a wide dynamic range of concentrations, from 0.1 to 1,000 mg/I, typical.

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