Lisst AOBS


The LISST-AOBS Super-Turbidity sensor is a patent pending, simple, low-cost sensor to measure suspended sediment concentration (SSC).


Super-Turbidity is a patent pending technology developed by Sequoia. It involves pairing a LISST-ABS with a turbidity sensor using a weight factor, which results in a single, combined output from the two sensors. Once paired, the LISST-AOBS retains near-constant calibration for SSC over a wide grain-size range. The LISST-AOBS Super-Turbidity sensor is supplied by Sequoia as an integrated and paired turbidity and acoustic sensor with a variety of cabling and data logger options.


Parameters measured :

Suspended Sediment Concentration (SSC; mg/l)



Concentration range :

1 – 30,000 mg/l (LISST-ABS) or

0 – 3,000 NTU (Turbidity PlusTM)


Technology :

Combined optical and 8MHz acoustic backscatter technology    

Optics per ISO 7027 Turbidity Technique

Mechanical wiper for optical backscatter

SDI-12 output

Sample volume (acoustic): 10mmØ x 15mmL @ 55mm from transducer


Mechanical and electrical :

5.72 cm (2.25″) H x 10.16 cm (4″) W x 33.65 cm (13.25”) L

Weight 0.7 kg (1.54 lb) in air

Transducer: 8 mmØ ceramic

Wavelength: 850 nm

Power supply: 9-15 VDC (12VDC nominal); 200 mA

Depth rating: 100 m

Material: ABS plastic and Delrin