SonTek®-SL Series

NEW SL1500/3000 3G MODELS! The SonTek-SL has two new (3G) models turbo-charged by our proprietary SmartPulseHD®, the featured accessories, mounting options, software, and a variety of integration formats ensure it fits your application.

  • Features
  • Specifications

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.

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 | 1.6 ft 1.0m | 3.3 ft 6.5m | 21 ft
Acoustics — Horizontal Beam Width•• 1.4° 1.4° 1.4°
Acoustics — Vertical Beam Width•• 1.4° 2.9° 3.8°
Acoustics — Side Lobe Suppression >60dB >60dB >60dB
Multi-cell Velocity Profiling Up to 128 cells Up to 128 cells Up to 10 cells
SmartPulse HD® Yes Yes n/a
SonTek Compass/Tilt Tilt Tilt Compass/Tilt
Internal Nonvolatile Memory 4GB 4GB 4MB
Water Velocity — Range ±7 m/s | 23 ft/s ±7 m/s | 23 ft/s ±6 m/s | 20 ft/s
Water Velocity — Resolution 0.0001 m/s | 0.0003 ft/s 0.0001 m/s | 0.0003 ft/s 0.001 m/s | 0.003 ft/s
Water Velocity — Accuracy ±1% of measured velocity;
±0.005 m/s | ±0.015 ft/s
±1% of measured velocity;
±0.005 m/s | ±0.015 ft/s
±1% of measured velocity;
±0.005 m/s | ±0.015 ft/s
Water Level — Vertical Beam Range 0.1 to 5m | 0.3 to 17 ft 0.15 to 10m | 0.5 to 33 ft 0.2 to 18.0m | 0.7 to 59 ft
Water Level — Vertical Beam Accuracy Depth <3m: ±0.3cm | 0.01 ft
Depth ≥3m: ±0.1%
Depth <3m: ±0.3cm | 0.01 ft
Depth ≥3m: ±0.1%
Depth <6m: ±0.6cm | 0.02 ft
Depth ≥6m: ±0.1%
Pressure Sensor — Range 30 m 30 m 20 m
Pressure Sensor — Accuracy FS 0.10% FS 0.10% FS 0.25% FS
Wave Height Spectra Optional Optional Optional
Temperature Sensor — Resolution ± 0.01º C ± 0.01º C ± 0.01º C
Temperature Sensor — Accuracy ± 0.2º C ± 0.2º C ± 0.1º C
Power Input 9-15 VDC 9-15 VDC 7-15 VDC
Power Consumption§ 0.8 W 1.0 W 0.7 to 1.0 W
Weight in Air 0.45 kg | 1.0 lb 0.90 kg | 2.0 lb 1.1 kg | 2.5 lb
Weight in Water 0.15 kg | 0.3 lb 0.2 kg | 0.5 lb 1.1 kg 2.5 lb
Pressure Rating & Maximum Depth 30 m | 98 ft 30 m | 98 ft 30 m | 98 ft
Mounting Plate Dimensions 25 x 17 x 1 cm | 10 x 6.7 x 0.4 in 25 x 17 x 1 cm | 10 x 6.7 x 0.4 in 35.5 x 22.9 x 1.5 cm | 14 x 9 x 0.6 in
Operating Temperature -5° to 60°C | 23° to 140°F -5° to 60°C | 23° to 140°F -5° to 60°C | 23° to 140°F
Storage Temperature -10° to 70°C | 14° to 148°F -10° to 70°C | 14° to 148°F -10° to 70°C | 14° to 148°F
Communications — Standard Protocols RS232/SDI-12/Modbus RS232/SDI-12/Modbus RS232/SDI-12
Communications — Software SonTek-SL: Intelligent Flow SonTek-SL: Intelligent Flow ViewArgonaut
Communications — Modbus Interface Module n/a n/a Required for Modbus
Communications — Analog Output Option Integrated on Flow Display Integrated on Flow Display Separate AO module
Communications — Flow Display Type SonTek Flow Display SonTek Flow Display Argonaut®

Actual maximum range depends on environmental conditions.
••Beam width reported at half power level (-3dB).
Side lobe suppression improves the aspect ratio of the instrument enabling greater measurement range in shallower water.
FS = Full Scale.
§ Power consumption will be higher is Flow Display is enabled.

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