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Water Quality

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Water Quality: A Foundation of Hydrological Monitoring

Measuring water quality is one of the foundations of hydrological monitoring for surface water applications, which can include open channels, rivers, reservoirs, lakes, and estuaries. It’s crucial to monitor essential indicators of water quality such as water temperature, conductivity, pH, dissolved oxygen, turbidity, and nutrients for a number of reasons, including preventing harmful algae blooms and the proliferation of invasive aquatic plant species.

OTT HydroMet's versatile water quality technology options including multiparameter sondes, CTD’s, and UV nitrate sensors provide flexible solutions for spot sampling or profiling, continuous deployment, or continuous deployment real-time. Reliable water quality data combined with powerful software tools helps professionals detect patterns, make better decisions, and increase efficiency in the lab and on the deployment site.

Our Products

Hydrolab HL4 - Multiparameter Sonde

The Hydrolab HL4 is the next generation multiparameter water quality sonde from OTT Hydromet. Its reliability, ease-of-use, and metadata produce water quality data you can trust.

  • Product type: Attended, Unattended
  • Parameters measured: Temperature, Conductivity, Depth, pH, Dissolved Oxygen (LDO), Turbidity, ORP, Chlorophyll a, Blue-green algae, Rhodamine, Ammonium, Nitrate, Chloride
  • Product highlights: The next generation multiparameter water quality instrument
  • Interface: SDI-12, RS-485, RS-232, TTY, USB

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Hydrolab HL7 - Multiparameter Sonde

The HYDROLAB HL7 multiparameter sonde offers a versatile, durable and practical solution for long-term continuous and profile monitoring for both simple and complex deployments.

  • Product type: Attended, Unattended
  • Parameters measured: Temperature, Conductivity, Depth, pH, Dissolved Oxygen (LDO), Turbidity, ORP, Chlorophyll a, Blue-green algae, Rhodamine, Ammonium, Nitrate, Chloride
  • Product highlights: The next generation multiparameter water quality instrument
  • Interface: SDI-12, RS-485, RS-232, TTY, USB

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OTT ecoN UV Nitrate Sensor

The OTT ecoN UV nitrate sensor combines field reliability with a user friendly, low operational cost, future ready platform. It uses optical UV absorption technology for the determination of nitrate concentrations in fresh surface and groundwater. The calculation of nitrate from the filtered absorption spectrum includes compensations for turbidity and organic interferences. Nitrate measurements and sensor status information is available in real-time for integration into data acquisition systems. The anti-fouling wiper reduces maintenance requirements and extends deployment times for continuous monitoring locations.

Important - this sensor is only for use in environmental fresh surface water and groundwater applications.

  • Parameters measured: NO3-N, NO3, NOx-N, Nox (calibrated with NO3 standard solution)
  • Measuring Range: 0.5-60 mg/L NO3-N
  • Accuracy: 1 mm = ± (5 % + 1.0 mg/L NO3-N)

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OTT Water Quality Buoy

The OTT measuring buoy is specially designed for operation in combination with the HYDROLAB HL7 or HL4 multiparameter sondes. It is equipped with a data acquisition and remote data transmission unit as well as a mains-independent solar power supply. Compared to conventional buoys, the multiparameter probe is mounted laterally in a pipe on the OTT measuring buoy. This eliminates the need to open the buoy during maintenance and calibration work, allowing tasks to be easily done from a small boat. To help reduce bio-fouling for longer maintenance intervals the HYDROLAB HL7 sonde is equipped with a central cleaning brush and a copper measuring cap.

  • Product Highlights: Stand-alone water quality measurement buoy solutionTemperature, Conductivity, Depth, pH, Dissolved Oxygen (LDO), Turbidity, ORP, Blue-Green Algae, Chlorophyll a
  • Communication: Cellular

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