Sequoia LISST-ABS Acoustic Sediment Sensor

The Sequoia LISST-ABS Acoustic Sediment Sensor 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 X-Series data loggers and telemetry systems
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Overview
The Sequoia Scientific 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.

Mechanics
The Sequoia Scientific LISST-ABS employs a high frequency of 8 MHz. Calibration of backscatter signal strength with sediment concentration remains nearly constant over a wide particle size range, ~40-500 microns. Over this size range, the Sequoia Scientific 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.

Remote Monitoring
The LISST-ABS sensor offers a plug-and-play interface to the NexSens X3 data loggers and telemetry systems. The X3 is available for pole-mount deployments with solar charging or connected to the SBP500 submersible alkaline battery pack for subsurface deployments.

  • 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)
Questions & Answers
Does this sensor come with a data logger?
No,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.
How is the LISST-ABS powered?
The sensor is powered by the communication cable when connected to a PC or via a power supply with a voltage between 10-18VDC.
What is the advantage of a single-point beam vs multiple point?
A single-point beam, rather than multi-point allows for more accurate measurements which are best within 5cm. The single beam coupled with a high-frequency allows for more constant readings throughout the range of particle sizes read by the instrument (~40-500 microns).
How does the LISST-ABS work?
The LISST-ABS sends a short pulse of 8MHz sound into water. It listens for backscattered echo from two points. The first point is the sample volume. This is the acoustic signal strength. The second point serves to estimate attenuation by sediments. When attenuation is significant, a correction is applied to the signal strength from the sample volume.
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