The first low-cost
acoustic backscatter sensor designed specifically for measuring
Suspended Sediment Concentration at a point. This is a new type of
sediment sensor, superior to turbidity or optical backscatter sensors
(OBS) for 4 reasons. See Related Articles in right column.

The LISST-ABS is easy to integrate into existing sensor platforms. Click here for simple version of how it works, or here to get a detailed explanation. For turbine abrasion protection, click here.

Features

•  Output: Backscatter signal strength in decibels as volts or digital value  (formula provided for conversion to concentration)
•  Sample Volume Location: 5.5 cm from sensor face.
•  Operating Frequency: 8MHz
•  Tolerant to biofouling
•  Calibration over 30-400 micron sizes: flat to within ±30%; [compare with ±400% for optical turbidity sensors]
•  Calibration for fine particles below 30 microns: response follows d^1.5
•  Analog, SDI-12 and Digital (RS232) outputs available on the underwater connector

The LISST-ABS is a single-point monitoring sensor. It
uses a new and novel technique to internally compensate for geometric
beam spreading and attenuation, yielding de-attenuated backscatter
signal strength. It is held pointing into flow for low drag.

See more environmental monitoring tools here.