Long-term monitoring / spot measurement of water quality

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

  • Designed for maximum durability in any application
  • Suitable for all applications: Fresh water - Salt water / Surface water - Ground water >> Point measurements / Long term deployment
  • Very low energy 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, ...) you need!

Reliability and robustness

The Aqua Troll 500 multi-parameter probe consists of a titanium probe body and customizable sensors that are robust, reliable and accurate

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

The probe is equipped with an LCD screen, allowing to quickly visualize the current status (status of the sensors, status of the bluetooth connection...)

Its reduced dimensions allow its use in drillings from Ø 2''.

One-time measurement or long-term monitoring

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

Point measurement

Coupled with the bluetooth communication kit

TROLL Com, you have a robust multi-parameter point measurement device with interchangeable sensors. Thanks to the dedicated mobile application, VuSitu (Android), let yourself be guided to configure the instrument, access and download the data in real time.

Long-term monitoring

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

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

Presentation of AquaTROLL 500/600 probes

Standard parameters

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

Optical sensors

Turbidity, Chlorophyll a, Phycocyanin, Phycoerythrin, Rhodamine WT

To come (end of 2021): Fluorescein, CDOM/FDOM, Crude Hydrocarbons.

Specific ionic electrodes

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

General characteristics

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

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

Presentation of the sensors

Smart sensors :

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

Smart sensors :

  • Flat face sensors, cleanable


  • Interlocking, optical


  • Automatic salinity compensation for O2D measurement, NIST traceability

Dissolved oxygen sensor (EPA approved)

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

Lifetime of the cap : 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 multi-parameter
    probe of this diameter
  • 4-electrode platinum conductivity sensor designed to be cleaned
  • Measuring range: 0 - 200 mS/cm
  • Also allows to measure the 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: refillable
  • Minimum drift for long term deployments

Pressure sensor (optional)

  • Absolute or relative pressure sensor
  • Ceramic sensor, piezo-resistive
  • Pressure ranges: 0-9m; 0-30m; 0-76m; 0-200m >> Accuracy: 0.1% FS

Anti-fouling solutions (option)

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 the titanium sleeve
  • To be used with or without a 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 probes can be connected to a single VuLink modem via one or more Y-cables
  • Built-in GPS for geolocation of the device