Concept
Sequoia LISST 25 in-situ particle sizer series
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL1710/1/ | |
|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | |
| Alternative Labels | LISST-25 | |
| Definition | A field instrument for suspended sediment monitoring. The LISST-25A and 25X instruments are simpler versions of the LISST-100 with a comet-detector instead of a multi-ring detector. The instrument can be used to measure: total volume concentration (µl/l); sauter mean diameter (µm); total volume concentration in sub-range (µl/l); sauter mean diameter in sub-range (µm); optical transmission (%); depth (m); and date and time. The comet-detector directly estimates concentration from the weighted sum of angular scattering. This device obtains particle area concentration from the optical transmission. The ratio of the volume concentration and area concentration is called the Sauter Mean Diameter (SMD). The two types of LISST-25 refer to an analogue output only version (LISST-25A) and a second version that is fully recording and presents a coarse fraction concentration in addition to the total suspended load (LISST-25X). The LISST-25X instrument has comet shapes built in to separate between wash load less than 63 µm and the sand load larger than 63 µm. The LISST-25 holds calibration for spheres over a 200:1 size range. Size ranges: 2.5 - 500 µm for the full range and 63-500 µm for the sub-range. The instruments depth range is 300 m at 7 cm resolution. | |
| Date | None | |
| Identifier | TOOL1710 | |
| Note | accepted | |
| Is Version Of | TOOL1710 | |
| version | 1 | |
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