Sequoia LISST-ABS Acoustic Sediment Sensor

The LISST-ABS from Sequoia Scientific is a low-cost sensor designed specifically for measuring suspended sediment concentration at a single point.

Features

  • Uses acoustic backscatter to measure the concentration of particles suspended in water
  • Wide dynamic range of concentrations from 1mg/L to 30 g/L
  • Plug-and-play interface with X2, X2-SDL, and X2-CB data loggers and telemetry systems
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ImagePart#Product DescriptionPriceStockOrder
Sequoia LISST-ABS Acoustic Sediment SensorSEQ-FP-ABS LISST-ABS acoustic backscatter sediment sensor
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ImagePart#Product DescriptionPriceStockOrder
Sequoia LISST-ABS USB Interface Cable SEQ-AC-ABS-CBL2 LISST-ABS USB interface cable, 2m
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NexSens UW to LISST-ABS Sensor Cable Adapter UW-ABS-1 Underwater X2 cable adapter for Sequoia LISST-ABS sensors, 1m
$405.00
Usually ships in 3-5 days
NexSens UW to LISST-ABS Sensor Cable Adapter UW-ABS-2 Underwater X2 cable adapter for Sequoia LISST-ABS sensors, 2m
$415.00
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NexSens UW to LISST-ABS Sensor Cable Adapter UW-ABS-5 Underwater X2 cable adapter for Sequoia LISST-ABS sensors, 5m
$445.00
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NexSens UW to LISST-ABS Sensor Cable Adapter UW-ABS-10 Underwater X2 cable adapter for Sequoia LISST-ABS sensors, 10m
$495.00
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NexSens UW to LISST-ABS Sensor Cable Adapter UW-ABS-15 Underwater X2 cable adapter for Sequoia LISST-ABS sensors, 15m
$545.00
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NexSens UW to LISST-ABS Sensor Cable Adapter UW-ABS-20 Underwater X2 cable adapter for Sequoia LISST-ABS sensors, 20m
$595.00
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NexSens Instrument Mooring Clamp MC-600 Mooring clamp for water quality instruments, fits 1/4" stainless steel wire rope
$95.00
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NexSens Sensor Instrument Cage Mount CM-600 Instrument cage mount for water quality sensors
$125.00
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Sequoia Scientific's LISST-ABS is a single-point acoustic sediment sensor, designed to provide higher quality data than optical turbidity sensors. The LISST-ABS internally measures the Attenuation Corrected Backscatter (ACB). The ACB value is converted to an Uncalibrated Concentration (Cu) and then output. To convert the Uncalibrated Concentration to sediment concentration, a simple multiplier is required. The multiplier, or Cal Factor, is dependent on the specific type and size of sediment being measured. When a user recalibrates an instrument, this multiplier is updated.

The LISST-ABS employs a high frequency of 8 MHz. This choice is made so that the calibration of backscatter signal strength with sediment concentration remains nearly constant over a wide particle size range, ~40-500 microns. Over this size range, LISST-ABS calibration changes only about ~±30%. In contrast, over this same size range, optical turbidity sensors would change calibration by ~ ±600% over its mean value. This is one of the key advantages of LISST-ABS over turbidity sensors.

The LISST-ABS sensor offers a plug-and-play interface to the full line of NexSens X2 data loggers and telemetry systems. The X2 is available for pole-mount deployments with solar charging near streams and rivers; the X2-SDL includes an integrated 16 D-cell alkaline battery pack for subsurface deployments; and the X2-CB is designed for integration on CB-Series data buoy platforms.

  • Frequency: 8 MHz
  • Sample Volume: 10mm dia x 15mm L (located 5.5 cm in front of sensor)
  • Resolution: 0.5 % of reading
  • Range: 1 mg/L to 30 g/L (7 micron dust) or <20 g/L (200 micron sand)
  • Calibration: Recommended with sediment samples
  • Sensor Diameter: 2.00 in (5.08cm)
  • Length: 13.25 in (33.65cm)
  • Weight: 1 lb. (0.5Kg) in air; 0.5 lb. (0.22Kg) buoyant in water
  • Transducer: 8mm dia, ceramic
  • Power Supply: 9 to 18 VDC, 100 mA
  • Maximum Depth: 100m
  • Material: ABS Plastic
  • Connector Type: Impulse MCBH-8-MP-SS
  • Power on LED: Green, blink on update
  • Sample Update Rate: 1Hz (average of 1000 measurements)
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