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SonTek IQ Continuous Flow Meter

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The SonTek-IQ uses a custom flow algorithm derived from hundreds of field measurements to output volume, flow, level and velocity in small channels


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Four velocity beams profile  velocity in 3-D (both vertically and horizontally) and one beam measures level to ensure a complete measurment of the velocity field.

  • Flow / volume in 8cm of water
  • Accuracy +/- 1% of measured velocity, +/- 0.5cm/s
  • 5-beam pulsed Doppler design
  • Up to 100 cells
  • MODBUS / SDI-12 / RS232 ready
  • Instals with limited or no earthworks
  • Data you can make decisions on



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Specification Sheets

SonTek IQ

SonTek SL3G

Velocity Measurement


Sampling Range*

SonTek-IQ plus




Number of cells Up to 100 1
Cell Size 2cm-10cm Dynamic integrated cell
Vertical Beam Range 0.05-5.0m 0.05-1.5m
Advanced Data Reprocessing Yes N/A
Increased Number of Data Fields Yes N/A
Velocity Measurement Velocity Range ±5m/s
Resolution 0.0001m/s
Accuracy ±1% of measured velocity, ±0.5cm/s
Water Level Pressure Sensor Range ±10m
Pressure Sensor Accuracy 0.1% of full scale
Water Level Accuracy 0.1% of measured depth or ±0.003m,
whichever is greater
Power Input 7-15VDC
Consumption* 0.5-1.0W (0.02 when idle)
Acoustics Acoustic Frequency 3.0MHz
(2) Along-Axis Beams 25° off vertical axis, along axis of channel
(2) Skew Beams* 60° off vertical axis and 60° off center of channel
Communications RS232, SDI-12, Modbus
Data Storage* 4GB (approximately 1-yr)
Operating Temperature -5 to 60° C
Temperature Sensor Yes
Tilt Sensor Yes
*Refer to the SonTek-IQ brochure for specific details regarding these parameters.




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