Menu

Sequoia Scientific

LISST-Horizon

Flow-Through Automated Particle Size and Scattering Measurement

The LISST-Horizon is a self-contained instrument for bench-top deployment in a research vessel laboratory.

Plumbed to continuous underway uncontaminated seawater, it continuously measures particle size distribution, concentration, and inherent optical properties.

A first prototype has been delivered to NASA (see our News release). Sequoia is taking orders for the LISST-Horizon.

For further information, contact us!

Features

  • Automated deployment in flow-through seawater systems, including clean water backgrounds, cleaning, and scattering standard measurement
  • Mixers in the sample chamber to keep particles suspended during measurement
  • Automated filtered sample background using attached external particle filter (0.2 μm)
  • Measures near-forward (0.1-15°, 36 log-spaced detectors) and side scattering (35-150°, 24 detectors) from a 520 nm laser source
  • Beam attenuation and particle sizing from proven LISST-200X optics, with extended pathlength for application to offshore waters
  • Side scattering allows for particle sizing over an extended range, ~0.2 to 500 μm
  • Raw data stored internally and offloaded via ethernet for processing with provided MATLAB software

Specifications

Parameters Measured

  • Volume scattering function (VSF) from 0.1 to 150°
  • Particle size distribution inverted from scattering measurements
  • Beam transmission
  • Derived IOPs including total scattering, backscattering, and absorption by difference (a = c – b)
  • Sample temperature and fluidics parameters such as pressures and flow rate

Mechanical and Electrical

  • Dimensions: L = 67.4 cm x W = 37.5 cm x H = 29.3 cm
  • Weight: 19 kg
  • Laser: 520 nm solid state diode laser
  • External power input: 110/220 VAC converted to 24 VDC using provided power brick
  • Plumbing connections using 3/8 inch OD (1/2 inch for drain) tubing and push-to-connect fittings
  • External tanks for holding clean water for background, cleaning solution, and scattering standard; each with pressure sensor for monitoring tank level

Accessories

LISST-Horizon Item # and Description

Item #DescriptionThumbnail
SEQ-FP-HORIZONLISST-Horizon
Self-contained instrument for bench-top deployment in a research vessel laboratory. Plumbed to continuous underway uncontaminated seawater, it continuously measures PSD and particle concentration, as well as inherent optical properties (IOPs) beam attenuation (c) and volume scattering function (VSF, β) at 520 nm.

FAQ