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Aqua TROLL 500 Multiparameter Sonde


With interchangeable sensors, the Aqua TROLL 500 replaces multiple instruments and saves time in the field to reduce overall monitoring costs. Highly stable sensors need minimal maintenance and calibration, giving you confidence in your data. Just plug the sonde into a Wireless TROLL Com, datalogger, control system or telemetry and you’re ready to go!

The Aqua TROLL 500 fits a wide variety of applications, including:

  • Surface water spot sampling and profiling

  • Remote monitoring via telemetry

  • Long-term drinking water, wastewater or stormwater monitoring

  • Aquaculture

  • Low-flow groundwater sampling and remediation



  • Base sensor configuration includes EPA-approved optical RDO, pH/ORP, turbidity, conductivity, temperature, and pressure, Salinity, resistivity, Total Dissolved Solids (TDS) and Density

  • Long-term pH stability: the Aqua TROLL 500 pH change is 0.0008 pH/day, or a change of 0.1 pH in 125 days. Learn more »

  • Ammonium, Chloride, and Nitrate Ion-Selective Electrode (ISE) available

  • Rhodamine WT, Chlorophyll a, and Blue Green Algae – Phycocyanin (BGA-PC) and Phycoerythrin (BGA-PE) – sensors available.

  • Interchangeable sensors, wet-mateable

  • Sub 2” antifouling wiper cleans all sensors for higher quality data in long-term deployments

  • Wireless Mobile Bluetooth® connection for Android (VuSitu app), and Win-Situ 5 for PC laptop

  • Site tagging and GPS coordinates functions available via mobile app

  • LCD display gives a snapshot of instruments health and wireless connectivity

  • Wide sensor range for performance in a variety of applications

  • Automatic environmental compensation eliminates data post-processing

  • Easy integration with PLC/SCADA control systems, data loggers, and telemetry—no adapters or confusing proprietary communication protocols

  • Redesigned pH and ISE reference for 3X sensor stability

  • Corrosion-resistant housing and abrasion-resistant RDO sensor

  • Compatible with Low-Flow system (sold separately)

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