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| LISST Instruments > LISST-25 |
LISST-25X
LISST-25X shipping case
LISST-25X with BioBlock installed
LISST-25X measurement principle
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LISST-25 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. This is the only sensor capable of holding
calibration for sediment concentration regardless of particle color or
size within this broad a range.
The
idea behind the LISST-25X is to use shaped focal plane detectors. These
detectors (see figure) derive their shape from the physics of light
scattering. The shape is found such that for any size of particle in
the 2.5 to 500 micron range, the instrument reports the correct volume
concentration. A different shape is found to yield area concentration.
The ratio of volume to area is called the Sauter Mean Diameter. The
instrument employs 2 paris of shaped detectors. One pair measures
particles in the 2.5 to 63 micron range, the other in the 63-500 micron
range. An anti-fouling accessory BioBlock is also available for this instrument.
The
instrument is self-contained, with memory and batteries. It is fully
programmable to set sample rate. Data can be internally stored or
captured in real time. A depth sensor is included as standard.
Software for data offload and display is provided.
The LISST-25A is discontinued since July 2005.
This LISST-25A was the original version. It has been superseded by the more powerful LISST-25X described above.
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|  | | LISST-WING |  | | Sequoia announces the availability of the airborne cloud droplet sensor based on laser diffraction technology. Key features: a large swept volume (90 l/s at 60 knots airspeed), no need for velocity data, and up to 16Hz recording of the size distribution. For more information, contact us. | |  | |  | | | |
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