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Observator 100 years


A slimmed-down design and SmartPulseHD® makes the SL1500 (3G) the most versatile system available. Collect high-quality data in a horizontal profile, range of 0.2m to 20m (0.7 to 66ft). Get the highestresolution and data quality possible – even as conditions change – courtesy of SmartPulseHD intelligence applied specifically for side-looking operation. Ideal for:

  • Rivers, streams, water delivery canals, irrigation canals and laterals.
  • Unrivaled performance in very slow (even no flow) and reversing conditions.
  • Hydropower, stormwater, and municipal sites that require easy access and cannot interfere with plant operations.


Dutch market only
Please be informed that we – as a reseller – are only allowed to sell/deliver Xylem/YSI and Xylem/SonTek products to the Dutch market.



  • Vertical acoustic beam plus pressure sensor for water level.
  • “Multicell” velocity profiling.
  • “Independent” velocity measurement cell. This cell can be different in size from the multicells and located anywhere within the instrument’s sampling range. This cell is used for flow calculations or other specialised functions.
  • Flow computation and output, including total volume.
  • FlowPack Velocity-Index Discharge Rating software package.

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