Onset HOBO Conductivity Sensor

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


  • 4-electrode conductivity sensor provides wide measurement range for monitoring freshwater or saltwater
  • Conductivity sensor is centrally located to minimize effects from stilling wells or protective guards
  • Specially treated stainless steel holds up in saltwater

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

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
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