Long-term monitoring / spot measurement of water quality

Aqua TROLL 500 is a robust, high-precision, multi-parameter probe for punctual or continuous monitoring of standard physico-chemical parameters in water.

  • Designed for maximum durability, whatever the application
  • Suitable for all applications: Freshwater - Saltwater / Surface water - Groundwater >> Point measurement / Long-term deployment
  • Extremely low power consumption: up to 9 months of autonomy for a measurement every 15 minutes (AquaTROLL 600)
  • Low maintenance: stable sensors, low long-term drift
  • Fully customizable probe: choose only the sensors and accessories (anti-fouling, cables, modems, etc.) you need!

Reliability and robustness

The Aqua Troll 500 multi-parameter probe features a titanium probe body and robust, reliable and precise customizable sensors.

suitable for use in the most hostile environments (corrosive environments, fresh or salt water...).

The probe is equipped with an LCD display for quick visualization of current status (sensor status, Bluetooth connection status, etc.).

Its small dimensions make it ideal for use in boreholes from Ø 2''.

One-off measurement or long-term monitoring

The Aqua TROLL 500 probe has been designed for two types of use:

Point measurement

Coupled with Bluetooth communication kit

TROLL Com gives you a robust multi-parameter point meter with interchangeable sensors. Thanks to the dedicated VuSitu (Android) mobile application, you can configure the instrument, access and download data in real time.

Long-term monitoring

Its Modbus RS485 and SDI-12 output signals also enable Aqua TROLL to be connected to most telemetry systems (PLC / SCADA) and PLCs for remote monitoring. The sensor can also be connected to a simple data logger.

Compatible with Tube300 / Cube300 GSM/GPRS modems and HydroVu web portal for near-instantaneous data monitoring from your office.

AquaTROLL 500/600 probe presentation

Standard parameters

Temperature, Conductivity, pH, Oxidation Reduction Potential (ORP), Dissolved Oxygen (optical).

Optical sensors

Turbidity, Chlorophyll a, Phycocyanin, Phycoerythrin, Rhodamine WT

Forthcoming (end 2021): Fluorescein, CDOM/FDOM, Crude hydrocarbons.

Specific ion electrodes

Ammonium, Nitrates, Chlorides  Pressure sensor (absolute or relative)

General features

IN-SITU range - Continuous monitoring AquaTROLL 500/600 probes

  • AquaTROLL 600: stand-alone multiparameter probe with battery (up to 9 months autonomy) and internal memory (100,000 data sets)
  • Aqua TROLL 500: version without battery or internal memory
  • 4 universal ports for connecting sensors
  • Bluetooth, SDI-12 and Modbus RS-485 communication
  • Bluetooth module with ToC and pressure sensors or USB kit
  • Operation via PC (Windows) or Smartphone / Android tablet

Sensor presentation

Smart sensors :

  • Store calibrations
  • Factory serial numbers
  • Have their own diagnosis

Smart sensors :

  • Flat-face, cleanable sensors


  • Interlocking, optical


  • Automatic salinity compensation for O2D measurement, NIST traceability

Dissolved oxygen sensor (EPA approved)

Optical technology: minimal maintenance and interference, long-lasting calibration

Cap lifespan: 2 years

  • Factory-calibrated
  • Accurate results from 0 to 50 mg/L
  • No flow required for measurement

Electrical conductivity sensor

  • The only cleanable sensor in a
    multiparameter probe of this diameter
  • 4-electrode platinum conductivity sensor designed for easy cleaning
  • Measurement range: 0 - 200 mS/cm
  • Also measures derived parameters: Salinity, TDS, Resistivity, Density

Turbidity sensor

  • Nephelometric sensor (ISO 7027)
  • Range from 0 to 4000 NTU
  • Self-compensating: In temperature / LED drift
  • Minimal interference with light exposure

Combined pH/ORP sensor

  • Electrochemical sensor
  • Liquid electrolyte: rechargeable
  • Minimum drift for long-term deployments

Pressure sensor (optional)

  • Absolute or relative pressure transducer
  • Piezoresistive ceramic sensor
  • Pressure ranges: 0-9m; 0-30m; 0-76m; 0-200m >> Accuracy: 0.1% PE

Anti-fouling solutions (optional)

o Brush (active anti-fouling)

  • Sediment protection, biological and non-biological activities
  • Multidirectional, cleans all sensors, double-sided
  • User-replaceable

o User-replaceable

  • Protection against biological activity
  • Same construction as titanium sleeve
  • For use with or without brush


Telemetry: VuLink modem

  • 4G LTE cellular network (2G fallback) or Satellite (Irridium)
  • Powered by alkaline or lithium batteries
  • Compatible with all IN-SITU probes (water level and quality)
  • Integrated barometric pressure sensor for automatic data compensation
  • Multiple sensors can be connected to a single VuLink modem via one or more Y cables
  • Integrated GPS for device geolocation