Onset HOBO CTD Sensors

The CTD sensor is an interchangeable sensor that works with HOBO MX800 Series Water Loggers to measure conductivity, temperature, and water level.

Features

  • 4-electrode conductivity sensor provides wide measurement range for monitoring freshwater or saltwater
  • Durable ceramic water level sensor, located in the sensor tip for accurate measurement of shallow water levels
  • Get water level directly with the MX802, no need for post-processing
$895.00
Stock 3AVAILABLE

The CTD sensor is an interchangeable sensor that works with HOBO MX800 Series Water Loggers to measure conductivity, temperature, and water level. With this sensor attached to a HOBO MX800 Series Water Logger, the logger can also calculate specific conductance, salinity, and total dissolved solids (TDS).

The CTD sensor can be attached directly to the fully submersible MX801 model, or attached via cable to the direct read MX802 model, which doesn’t require having to pull the sensor out of the water to download data.

Sensor  
Dimensions 2.5 cm (1 inch) diameter, 15 cm (6 inches) length
Weight Approximately xx g (xx oz) in air; approximately xx g (xx oz) in saltwater
Wetted Materials Passivated 316 Stainless steel housing rated for use in saltwater, Viton and Buna-N O-rings, PET sensor connector
  Conductivity sensor: PET, platinum plating on electrodes
  Note: Sensor should be mounted so that it is not in contact with other metals
Environmental Rating IP68; Waterproof to 100m
Conductivity Measurements  
Measurement Range Electrical conductivity and specific conductance: 0 to 100,000 µS/cm
  Salinity using PSS-78: 2 to 42 PSU
  Total Dissolved Solids (TDS): 0 to 100,000 mg/L
Calibration Range Electrical conductivity: 50 to 80,000 µS/cm
  5° to 35°C (41° to 95°F)
Accuracy Conductivity: +/-2% or 15 µS/cm whichever is greater
  Salinity: +/-2% of reading or 0.1 PSU, whichever is greater
Resolution Conductivity:0.1 µS/cm from 0 to 1,000 µS/cm | 1 µS/cm from 1,000 to 10,000 µS/cm |10 µS/cm from 10,000 to 100,000 µS/cm
  Salinity: 0.01 PSU
  TDS: 0.1 mg/L
Response Time 1 second to 90% at a stable temperature
Temperature Measurements  
Range -20° to 50°C (-40° to 122°F), non-freezing water
Accuracy ±0.15°C (±0.27°F) from 0° to 50°C (32° to 122°F)
Resolution 0.01°C at 25°C (0.018°F at 77°F)
Response Time 3 minutes to 90% in water (typical)
Drift <0.1°C (0.18°F) per year
Absolute Pressure and Water Level Measurements W-CTD-04
Range 0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range 69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F)
Burst Pressure 310 kPa (45 psia) or 18 m (60 ft) depth
Water Level Accuracy* Typical error: ±0.075% FS, 0.3 cm (0.01 ft) water
  Maximum error: : ±0.15% FS, 0.6 cm (0.02 ft) water
Raw Pressure Accuracy** ±0.3% FS, 0.43 kPa (0.063 psi) maximum error
Resolution <0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) water
Pressure Response Time*** <1 second to 90% at a stable temperature
Absolute Pressure and Water Level Measurements W-CTD-01
Range 0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of water depth at sea level, or 0 to 12 m (0 to 40 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range 69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F)
Burst Pressure 310 kPa (45 psia) or 18 m (60 ft) depth
Water Level Accuracy* Typical error: ±0.05% FS, 0.5 cm (0.015 ft) water
  Maximum error: ±0.1% FS, 1.0 cm (0.03 ft) water
Raw Pressure Accuracy** ±0.3% FS, 0.62 kPa (0.09 psi) maximum error
Resolution <0.02 kPa (0.003 psi), 0.21 cm (0.007 ft) water
Pressure Response Time*** <1 second to 90% at a stable temperature
Absolute Pressure and Water Level Measurements W-CTD-02
Range 0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range 69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
Burst Pressure 500 kPa (72.5 psia) or 40.8 m (134 ft) depth
Water Level Accuracy* Typical error: ±0.05% FS, 1.5 cm (0.05 ft) water
  Maximum error: ±0.1% FS, 3.0 cm (0.1 ft) water
Raw Pressure Accuracy** ±0.3% FS, 1.20 kPa (0.17 psi) maximum error
Resolution ±0.3% FS, 1.20 kPa (0.17 psi) maximum error
Pressure Response Time*** <1 second to 90% at a stable temperature
Absolute Pressure and Water Level Measurements W-CTD-03
Range 0 to 850 kPa (0 to 123.3 psia); approximately 0 to 76.5 m (0 to 251 ft) of water depth at sea level, or 0 to 79.5 m (0 to 262 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range 69 to 850 kPa (10 to 123.3 psia), 0° to 40°C (32° to 104°F)
Burst Pressure 1,200 kPa (174 psia) or 112 m (368 ft) depth
Water Level Accuracy* Typical error: ±0.05% FS, 3.8 cm (0.125 ft) water
  Maximum error: ±0.1% FS, 7.6 cm (0.25 ft) water
Raw Pressure Accuracy** ±0.3% FS, 2.55 kPa (0.37 psi) maximum error
Resolution <0.085 kPa (0.012 psi), 0.87 cm (0.028 ft) water
Pressure Response Time*** <1 second to 90% at a stable temperature
*Water Level Accuracy: With accurate reference water level measurement, known water density, and a stable temperature environment. System Water Level Accuracy equals the sum of the Barometric Water Level Accuracy plus the selected CTD sensor Water Level Accuracy.
** Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.
***Changes in Temperature: Allow 20 minutes in water to achieve full temperature compensation of the pressure sensor. There can be up to 0.5% of additional error due to rapid temperature changes.
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HOBO CTD conductivity, temperature & depth sensor, 13' range
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HOBO CTD conductivity, temperature & depth sensor, 30' range
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HOBO CTD conductivity, temperature & depth sensor, 100' range
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HOBO CTD conductivity, temperature & depth sensor, 250' range
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