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LISST-ABS

Submersible Acoustic Backscatter Sediment Sensor

Sequoia Scientific, Inc. is proud to offer 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 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.

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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

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