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SonTek Argonaut-SL Side-Looker

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Designed with the need for an easy way to measure water velocity, level and calculate flow / discharge in open channels, the Argonaut-SL has earned worldwide acceptance as a long-term monitoring solution. Fully featured with accessories, mounting options, software, and a variety of integration formats, the Argonaut-SL fits your application in the way you need it to.


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NEW SL1500/3000 3G MODELS! Inspired by the need for a SIMPLE way to measure water velocity and level in open channels, the SonTek-SL (affectionately known as the Side-Looker or "SL") has earned worldwide acceptance as a long-term monitoring solution. Now, with two new (3G) models turbo-charged by our proprietary SmartPulseHD®, the SonTek-SL features  accessories, mounting options, software, and a variety of integration formats to ensure it fits your application. 

Designed specifically for side mounting on bridges, canal walls, or riverbanks, the SL's SLEEK, low-profile housing makes installation easy.  With three models to choose from, the SL can be used in channels as small as you can jump across to rivers as wide as the Amazon. Ultra narrow beam widths combined with unmatched side lobe suppression provide the SUPERIOR acoustic directivity necessary for achieving maximum horizontal range free of interference from surface or bottom boundaries.


First time users can collect test data within minutes of receiving the SonTek-SL. Deployments require only a few minutes to configure the SL and start collecting data. This system provides the highest quality Doppler velocity data without requiring the user to become an expert on Doppler technology.

Water Velocity and Level: Water velocity, level, flow, and total volume-multiple parameters from one easy-to-use instrument. Acoustic Doppler profile of velocity data and acoustic water level offer the most accurate, reliable measurements.

SmartPulseHD®*: An intelligent algorithm that looks at water depth, profiling range, velocity, and turbulence, and then acoustically adapts to those conditions using pulse-coherent, broadband, and incoherent techniques.  Best data possible under any condition.  High-def cell sizes down to 4 cm.

Compact, Hydrodynamic Design: Incredibly lightweight and easy to transport and mount.  Slim shape is easy to maintain, stays clean, increases available sample area, and fits into more places.

Water Velocity Profiling: Customizeable, flexible setup options to suit a variety of applications. 3G models offer 128-cells for high-resolution and detailed profiles.

Acoustic-Pressure "Duo" Water Level (3G models only): Not only redundant sources of water level, the acoustic vertical beam and pressure sensor continually self-check, and pressure data are auto-corrected to keep atmospheric offset negligible.

Versatile, Easy Mounting:  Easy-access side mounting reduces concerns over personnel safety, lowers operational cost by avoiding divers and boats, avoids interruption in facility operations, and avoids interruption in data and water delivery to clients and stakeholders.

Wave Spectra Option: Integrated pressure sensor calculates and outputs wave-height and period, in real-time.

*SL1500/3000 3G models only. Patent pending.




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Specification Sheets

SonTek SL3G


Sampling range 0.1 to 5m | 0.3-17 ft 0.2 to 20m | 0.7-66 ft 1.5 to 120m | 5-400 ft
Minimum Channel Width 0.5m | 2.5 ft 1m | 5 ft 6.5m | 21 ft
Horizontal Beam Width 1.4° 1.4° 1.4°
Vertical Beam Width 1.4° 2.9° 3.8°
Side Lobe Suppression >60dB >60dB >60dB
Multi-Cell Velocitiy Profiling Up to 128 cells Up to 128 cells Up to 128 cells
SmartPulse HD Yes Yes n/a
Water Level
Vertical Beam Range 0.1 to 5m | 0.3-17 ft 0.15 to 10m | 0.5-33 ft 0.2 to 18.0m | 0.7-59 ft
Depth<3m (SL500 <6m)
Depth≥3m (SL500 ≥6m)
±0.3cm (0.01 ft)
±0.3cm (0.01 ft)
±0.6cm (0.02 ft)
Pressure Sensor 0.10% FS 0.10% FS 0.25% FS
Wave Height Spectra Optional Optional Optional
Input 9-15 VDC 9-15 VDC 9-15 VDC
Consumption 0.8 W 1.0 W 0.7 to 1.0 W
Weight in Air 0.45kg 0.90kg 6kg
Weight in Water 0.15kg 0.20kg 1.1kg
Pressure Rating 30 m | 98 ft 30 m | 98 ft 30 m | 98 ft
Mounting Plate Dimensions 25 x 17 x 1 cm 25 x 17 x 1cm 35.5 x 22.9 x 1.5cm




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