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| Settling Velocity Sensors |
LISST-STX
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The LISST-STX is a submersible field instrument developed for in-situ observation of the size-dependent settling velocity distribution of suspended particles. It incorporates a mechanized Settling Column. In a Settling Experiment, a water sample is drawn and trapped. The evolution of the size distribution near the base of the settling column during the settling experiment is interpreted to estimate settling velocities. Settling velocities are estiamted for 8 log-spaced size classes covering the range 1.25-250 microns (Type B), or 2.5-500 microns (Type C).
In addition to
particle size distribution histories with each settling experiment,
water pressure and temperature are also recorded.
The LISST-STX
is a fully autonomous, battery operated, self-contained unit. It is
engineered for low power consumption and built to withstand the rigors
of field deployment. Easy to program features permit flexibility in
duration of experiments, and in operating modes. | | | | | 
The LISST-STX in its main shipping case
| | The LISST-STX is separated into 2 parts when shipping: the main pressure housing (shown on the left) and the settling tube, shipping in a separate box. It is possible to use the LISST-STX without the settling column attached. In this mode it can be used as a LISST-100X. However, due to the difference in the optics end caps of the LISST-100X and the LISST-STX, no accessories designed for the LISST-100X will work with the LISST-STX, except for cables, clamps, stands, a 50% optical path reduction module and a custom mixing chamber.
For more details about using the LISST-STX as a LISST-100X, read the article 'Using the LISST-STX as a LISST-100X'.
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The LISST-STX settling tube in its shipping case
| | The LISST-STX is designed to carry out multiple settling experiments
while submerged. A motorized mechanism operates the doors that control
exchange of water between the settling column and the ambient
environment. This permits repeated settling experiments. A separate
built-in motorized stirrer is used to agitate and flush out settled
particles after each settling experiment.
Click the YouTube video links below to see the motor, door and propellor in action. | | | | | 
LISST-STX shipping cases
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| | This video shows the detail of the bottom of the motor block, and the bottom door open and close sequences.
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| | This video shows the entire settling column, incl. the opening and closing of the top of the settling column.
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|  | | Sequoia visit to Colombia and Ecuador! |  | | Sequoia's Yogi Agrawal and Ole Mikkelsen visited C'Particulas, Sequoia's Colombian distributor 28-30 November 2011. See the pictures on our facebook page! | |  | |  | |
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