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Hoskin Scientific Limited
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Sequoia Scientific - Model E-J48-LISST-ABS -Submersible Acoustic Backscatter Sediment Sensor

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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. 

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  • THE 8MHZ ACOUSTIC SENSOR ‘SEES’ ALL SIZE GRAINS, AND UNLIKE OBS, IT SEES COARSE GRAINS VERY WELL.
  • THE LISST-ABS CALIBRATION IS FAR LESS SENSITIVE TO GRAIN SIZE
    CHANGES THAN OBS SENSORS, CHANGING ONLY ~ ± 30% OVER 30-400 MICRONS (SEE
    APPLICATION NOTE).
  • OPERATES OVER  A >4-DECADE WORKING RANGE IN CONCENTRATION!
  • TOLERATES FOULING.

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.

  • 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.