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Surface Water

Measuring water quantity and quality in surface water (open channels, rivers, reservoirs, lakes, and estuaries) is one of the foundations of hydrological monitoring and has been a focus of OTT Hydromet since its first  water current meters were designed in 1875.

OTT Hydromet provides versatile technology options for measurement of water level, flow/discharge, and water quality in surface water applications:

  • OTT surface water level sensors featuring a variety of measurement technologies (radar, bubbler, pressure) to meet many application needs
  • OTT current meters to measure surface water flow and discharge, with options for in-stream portable measurement or fixed installations
  • Hydrolab mulitparameter sondes for measurement of water quality either in spot sampling or unattended in real-time
  • Sea-Bird Coastal instruments for unattended nutrient water quality measurement
Acoustic Digital Current Meter

OTT ADC - Acoustic Digital Current Meter

Handheld, acoustic water flow, velocity meter for in-stream point velocity measurements

The OTT Acoustic Digital Current meter (ADC) delivers consistently accurate results with the most advanced acoustic technology available for point velocity measurement.

  • Spot
  • Acoustic
  • Flow velocity, depth
  • Latest state of the art ultrasonic Doppler technology for high accurate velocity measurements. Maintenance free sensor with integrated depth measurement, graphical step by step user guidance and discharge calculation according to ISO 748 and USGS standard
  • -0.2 … 2.4 m/s
  • ± 1% of measured value ± 0.25 cm/s
Groundwater level sensor and data logger

OTT ecoLog 500 Water Level Logger

Water level sensor with built-in datalogger for surface and groundwater applications

The OTT ecoLOG 500 is a self-contained water level instrument offering flexible remote data options and unequaled performance for the price.

  • Surface water Groundwater
  • Vented pressure cell
  • Waterlevel/Pressure, Water temperature
  • Measures, stores, and transmits water level and temperature data
  • ± 0.05% FS
  • Yes
Integrated pressure level transducer and datalogger

OTT Orpheus Mini Water Level Logger

Pressure level transducer with datalogger for longterm groundwater monitoring

The OTT Orpheus Mini is an integrated pressure sensor and datalogger for level measurement in surface and groundwater applications.

  • Surface water Groundwater
  • Vented pressure cell
  • Waterlevel/Pressure, Water temperature
  • Measures and stores water level and temperature data
  • 0 … 4, 10, 20, 40, and 100 m
  • ± 0.05% FS
  • Yes
With integrated sensor and datalogger for longterm monitoring

OTT CTD Sensor

Pressure sensor for longterm measurement of conductivity, temperature and water level

The OTT CTD is an integrated sensor and datalogger for measurement of water level, temperature, and conductivity in groundwater and surface water applications.

  • Surface water Groundwater
  • Vented pressure cell and 4-electrode graphite conductivity cell
  • Waterlevel, Temperature, Conductivity
  • Measures and stores water level, temperature, and conductivity data
  • Water level: 0 … 4, 10, 20, 40, and 100 m Conductivity: 0.001…2.000 mS/cm, 0.10…100.00 mS/cm
  • ±0,05 % FS
  • Yes
Non-contact bubbler in water level sensor for surface water monitoring

OTT CBS - Compact Bubbler Sensor

Non-contact, bubbler sensor for longterm surface water level monitoring

The OTT CBS is a compact, accurate, and low power bubbler sensor for surface or groundwater level monitoring.

  • Surface water Groundwater
  • Bubbler-in
  • Drift-free water level measurement - no pressure sensor or electronics in the water
  • 0 to 15 m or 0 to 30 m
  • ± 3 mm (high accuracy version); ± 5 mm (standard and 30 meter versions)
  • No
  • SDI-12, RS-485 (using SDI-12), or 4 ...20 mA
Contact gauge OTT KL010

OTT Contact Gauges

OTT Contact Gauges for measurements of depth to water, temperature and conductivity

OTT Contact Gauges are essential for manual water level measurements in groundwater. For measuring depth to water, temperature, and conductivity – depending on the variant.

  • Measuring tape lengths KL010: 15 ... 750 m; KL010 TM: 25 ... 500 m; KL010 TCM 30 ... 500 m
  • Groundwater
  • Contact gauge
  • Water level / Distance to water, Temperature, Conductivity
  • Manual water level, temperature and/or conductivity measurement
New water quality sonde platform: ease of use, meta-data, reliability

Hydrolab HL4 Multiparameter Sonde

New Hydrolab Platform: Reliability, Ease-of-use, Metadata

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.

  • Attended Unattended
  • Temperature, Conductivity, Depth, pH, Dissolved Oxygen (LDO), Turbidity, ORP, Clorophyll a, Blue-green algae, Rhodamine
  • The next generation multiparameter water quality instrument
  • SDI-12, RS-485, RS-232, TTY, USB
Long term water quality multi-meter

Hydrolab DS5 - Multiparameter Data Sonde

Water Quality Sonde with Flexible Sensor Payload

Hydrolab DS5 multiparameter water quality sonde offers the most Hydrolab sensors on a multiparameter platform for either profiling or unattended monitoring.

  • Attended Unattended
  • Temperature, Conductivity, Depth, pH, Oxygen Reduction Potential (ORP), Dissolved Oxygen (LDO), Dissolved Oxygen (Clark Cell), Turbidity, Chlorophyll a, Blue-Green Algae, Rhodamine WT, Ammonium, Nitrate, Chloride, Total Dissolved Gas (TDG), Ambient Light
  • The Hydrolab sonde with the most available sensors
  • SDI-12, RS-485, RS-232, TTY
Lightweight multi-probe water quality testing instrument

Hydrolab MS5 - Mulitparameter Mini Sonde

Lightweight multi-probe with four ports available for water quality sensors

The Hydrolab MS5 multiparameter water quality sonde offers a selection of Hydrolab sensors on a compact and lightweight multiprobe designed for either profiling or unattended monitoring.

  • Attended Unattended
  • Temperature, Conductivity, Depth, pH ,ORP, Dissolved Oxygen (LDO, Clark cell), Turbidity, Chlorophyll a, Blue-Green Algae, Rhodamine WT, Ammonium, Nitrate, Chloride , TDG
  • The Hydrolab sonde profile for a smaller sensor payload that will fit in a two-inch well
  • SDI-12, RS-485, RS-232, TTY
multiparameter sonde for basic water quality spot measurements

Hydrolab Quanta Multi-Probe Meter

Multiparameter sonde for basic water quality spot measurements

For basic water quality spot measurements the Hydrolab Quanta multiparameter water quality sonde offers Hydrolab's sensor technology in a complete, cost-optimized system package that includes an easy-to-use handheld display.

  • Attended
  • Temperature, Conductivity, Depth, pH, Oxygen Reduction Potential (ORP), Dissolved Oxygen (Clark Cell), Turbidity
  • The Hydrolab sonde for basic spot measurements
  • SDI-12
Sea-Bird Scientific Suna

Sea-Bird Scientific SUNA Optical Nitrate Sensor

High accuracy in-situ nitrate measurement

The Sea-Bird Scientific SUNA V2 UV nitrate sensor with technology by Satlantic is the ultimate chemical-free solution for autonomous monitoring in estuarine and freshwater environments.

  • Attended Unattended
  • Nitrate
  • High-accuracy, chemical-free, in-situ nitrate measurement
  • SDI-12, RS-232
superior long-term monitoring water quality SBC WQM

Sea-Bird Scientific WQM

Water Quality Monitor for Maximum Deployment Times

The Sea-Bird Scientific WQM X with technology by Sea-Bird Electronics and WET Labs is designed specifically for long-term moored operations in biologically rich water.

  • Unattended
  • Conductivity, pressure, chlorophyll, temperature, dissolved oxygen, turbidity
  • Designed specifically for extended deployment in biologically rich waters
  • RS-232
Seabird Scientific HydroCat water quality

Sea-Bird Scientific HydroCAT

For longterm water quality monitoring with proven anti-fouling technology

The Sea-Bird Scientific HydroCAT with technology by Sea-Bird Electronics (SBE) is ideally suited for extended deployments in remote, biologically rich environments.

  • Unattended
  • Temperature, Pressure, Dissolved Oxygen, Conductivity
  • Ideally suited for extended deployments in remote, biologically rich environments
  • SDI-12, RS-232, RS-485 (optional)
Water Quality Solutions Overview Video
OTT RLS Overview Video
Surface Water Level Sensor Guide
Discharge Sensor Selection Guide
Hydrolab HL4 Overview Video
Hydrolab HL4 Overview Video
OTT MF pro Video - EN
OTT ADC Video - EN
Video - Adcon Smart Wireless Systems - EN
Turbidity White Paper
Turbidity White Paper
Nutrient Monitoring App Note
QA QC White Paper
Fluorescence White Paper
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