● Suspended sediment concentration ● Sensitive response ● Prevent biological attachment

the United States Sequoia The company has proudly launched the first suspended sediment measuring instrument based on acoustic backscatter technology. The sensoradopted 8MHz Acoustic sensors outperform optical backscatter（The response of OBS sensors to changes in particle sizeSubsize from 30 Microns increase to 400 When it comes to micrometers LISST-ABS The calibration results can still be maintained at± 30%, andtraditionalOBSThe error of the sensor is as high as±400%。 LISST-ABSIt is a single point detection sensor that uses fullThe new technology compensates for the scattering and attenuation of geometric beams to maintain a constant backscatter signal strength. It should be transmittedThe concentration measurement of the sensor is within the particle size range 5-10 In the case of micrometers, it can reach up to 70kg/m3The interface method of the system is flexibleLive, analog signalSDI-12 and RS-232 Signals can be directly output from sensors.

Compared to traditional OBS In terms of sensors,LISST-ABS The measurement results will not be affected by biological attachment, thereforeMore suitable for long-term underwater monitoring, the current pressure resistance level of the sensor is 100m。

Key Features:

·Measurement data: backscatter signal intensity Db (software can convert to concentration)

·Sampling location: in front of the sensor5.5cm place

·Working frequency:8MHz

·Prevent biological attachment

·Calibration stability（30-400Microns):± 30% [Traditional OBS is ± 400%

·less than 30 Micron fine sand calibration: compliant d1.5

Technical Indicators:

Sensor type: Point sensor

Sensor diameter:5.08cm

Sampling volume:10mm (diameter) * 15mm (length)

Sensor length:33.65cm

Working frequency:8MHz

Weight:0.5kg (air), 0.22kg (water)

Hardware interface:0-5V，1Hz，SDI-12 or RS-232

Transducers: Diameter 10mm， ceramics

Unit Conversion: Engineering Unit

External power supply:11-18VDC

Measurement range:1mg/l-70g/L（MD=7 <50g/L(MD=200 micron)， power waste:80mA

Voltage resistance level:100m (optional deeper)

Calibration method: Sample calibration/On site calibration

Shell material:ABS plastic

System drift: internal temperature and aging compensation

Underwater connector:Impulse MCBH-8-MP-SS

The image on the right illustrates ABS sensors and OBS The sound of sensors We can clearly see the trend line from the graphWhen the size of the product increases to sand or larger coarse sand OBS The corresponding response is very weak. But on the other hand ABS sensingThe device is 30-400 Within the range of micrometer particle size variation Still able to maintain a relatively stable response,The change in numerical values is maintained at approximately 30%.

The image on the right indicates particles of a single size, compared to particles of multiple sizesThe response of the sensor in the case of particles is at this valueSquare, the final value is the number of particle measurements for all sizesSum of values divided by square.