OTT HydroMet

- Model CTD - Integrated Sensor and Datalogger

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The OTT CTD is an integrated sensor and datalogger for measurement of water level, temperature, and conductivity in groundwater and surface water applications. It features a robust ceramic measuring cell for long term accuracy and has outputs for salinity and total dissolved solids (TDS).  Its built in datalogger manages and stores all measurements at user-programmable intervals.

  • 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

  • Outputs for conductivity include specific conductivity, salinity, and total dissolved solids
  • Ceramic pressure cell provides industry-leading accuracy
  • Conductivity, depth, and temperature measurements are combined into a single device that easily installs in a 1” or larger well or conduit
  • 4 MB of memory provides capacity for over 500,000 data points—ideal for long-term deployments OR short-term, high resolution pumping studies
  • Can be powered for over 18 months with off-the-shelf alkaline batteries or over 5 years with lithium batteries
  • Ability to perform contact gauge control measurements without sensor removal, so no need to pull the cable for routine maintenance
  • Complete in-well solution: all components are inserted into the groundwater well, eliminating the possibility of instrument vandalism
  • Battery life: up to 5 years with lithium batteries, with alkaline options are also available.
  • Long-term accuracy: a robust ceramic pressure cell will not deform over time, and an accurate 4-electrode conductivity measuring cell provides outputs for salinity and total dissolved solids (TDS)
  • User-friendly interaction: only one program required to setup unit and download data, plus a simple infrared communication interface that provides easy on-site data download 
  • Simple Maintenance: Infrared interface, batteries, and desiccant are accessible at the top of the well or pipe and no tools are required

Continuous or real-time water level, temperature, and conductivity measurement of:

  • Groundwater wells
  • Streams, rivers, channels, and canals
  • Reservoirs, lakes, and wetlands

Ideal for monitoring:

  • Continuous water level networks
  • Short-term or long-term projects
  • Salt water intrusion
  • Aquifer storage and recovery
  • Estuaries and wetlands

  • Lifetime (@ 1 h interval):
  • with Lithium-batteries: ≥5 years
  • with Alkaline-batteries: ≥1.5 years
  • Interface: Infrared (IrDA)
  • Datalogger:
  • Memory: 4 MB
  • Amount of values: approx. 500,000
    • Measurement interval: 5 sec ... 24 h
    • Storage interval: 5 sec ... 24 h
  • Installation: ≥ 1'
  • Material: ABS, POM, stainless steel 1.4539 (904 L)
  • Weight:
    • Com unit (incl. bat): approx. 0.410 kg
    • Sonde: approx. 0.430 kg
  • Dimensions:
    • Com unit L x Ø: 400 mm x 22 mm
    • Sonde L x Ø: 317 mm x 22 mm
  • Max system length: 1.5 … 200 m ±1 % ±5 cm
  • Storage temperature: -–40 ... +85 °C
  • Protection class:
    • Com unit: IP67 (water column max. 2 m, duration max. 24 h)
    • Sonde: IP68
  • Water level measurement:
    • Measurement range:: 0 ... 4 m, 10 m, 20 m, 40 m, 100 m
    • Resolution:: 0.001 m / 0.1 cm / 0.01 ft / 0.1 inch
    • / 0.0001 bar / 0.001 psi
    • Accuracy:: ± 0.05 % FS
    • Units:: m, cm, ft, inch, bar, psi
    • Temperature compensated operating range: –-5 .... +45 °C (icefree)
  • Temperature measurement:
    • Measurement range:: –-25 ... +70 °C
    • Resolution:: 0.01 °C
    • Accuracy:: ± 0.1 °C
  • Conductivity measurement: Measurement range selectable
  • Measurement range 1:: 0.001 ... 2.000 mS/cm
    • Resolution:: 0.001 mS/cm
    • Accuracy:: ±0.5 % of measurement value; (min ±0.001 mS/cm)
    • Units:: mS/cm / µS/cm
  • Measurement range 2:: 0.1 ... 100 mS/cm
    • Resolution:: 0.01 mS/cm
    • Accuracy:: ±1.5 % of measurement value; (min ±0.01 mS/cm)
    • Units:: mS/cm
  • Electrical data:
    • Power supply: Lithium or Alkaline batteries
    • 3 x 1.5 V battery (LR6·AA, FR6·AA)

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