Sequoia LISST-AOBS Super-Turbidity Sensor
Features
- Paired acoustic and optical technologies
- Near-constant calibration within a factor of two for grain-sizes from 1–500 µm
- Includes Y-cable providing power and integrated SDI-12 communication to and from both sensors
- Expedited repair and warranty service
- Lifetime technical support
- More
Overview
The Sequoia LISST-AOBS is a simple, low-cost Super-Turbidity sensor that measures suspended sediment concentration (SSC; mg/l) and turbidity (V). The Sequoia Super-Turbidity sensor 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.
Connectivity
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. The Sequoia Super-Turbidity sensor includes a Y-cable providing power and integrated SDI-12 communication to and from both sensors.
Parameters measured
- Suspended Sediment Concentration (SSC; mg/l)
Concentration range
- 1 – 30,000 mg/l (LISST-ABS)
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); 75 mA
- Depth rating: 100 m
- Material: ABS plastic and Delrin
- (1) LISST-ABS acoustic sediment sensor
- (1) Turbidity Plus turbidity sensor
- (1) LISST-AOBS Y-cable
- (1) LISST-AOBS connecting bracket
In The News
Applied Research and Innovative Solutions: Creating CHNGES at Western Kentucky University
Long-standing environmental monitoring programs have the power to support a large number of research initiatives and policy changes—however, actually starting these networks can prove challenging. Not only is starting the program difficult, but keeping things operational for decades to come has also been challenging for environmental professionals hoping to make an impact with applied research. 
 
Jason Polk, Professor of Environmental Geoscience and Director of the Center for Human GeoEnvironmental Studies (CHNGES) at Western Kentucky University, is all too familiar with this process.
Read MoreCombating Water Insecurity in Saskatchewan with Real-Time Data
The prairies of Saskatchewan can be described as one of the least water-secure parts of Canada, making water quality monitoring essential for informed resource management in a region already facing water insecurity. While natural physical properties worsen some of the poor water quality conditions in the region, others are connected to land use. 
 
Having grown up spending summers on the shores of Lake Huron, Helen Baulch, an associate professor at the School of Environment and Sustainability at the University of Saskatchewan , has always been dedicated to the protection of water resources. 
 
Looking back fondly at her childhood playing along the shore, Baulch also recalls the invasion of quagga mussels during her teenage years and watching the lake change as a result.
Read MoreSeametrics Turbo Turbidity Logger: Boost your Turbidity Monitoring
The Seametrics Turbo Turbidity Logger is a self-cleaning turbidity sensor capable of internally logging over 260,000 data records. The sensor enables researchers, compliance officers, and contractors to monitor turbidity in various applications, from construction and dredging sites to wastewater effluent. 
 
 Due to its narrow width, this device can be deployed in a range of areas, from small well spaces to rivers and streams. The stainless steel housing and built-in wiper allow the sensor to withstand long-term deployments and reduce the need for maintenance trips. 
 
 The logger accurately records temperature and turbidity up to a depth of 50 meters.
Read More