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Hobo W-CT Conductivity Sensor

The conductivity sensor is an interchangeable accessory designed for use with the HOBO MX800 Series Water Loggers, enabling them to measure conductivity and temperature. When connected to a HOBO MX800 Series Water Logger, this sensor also allows the device to calculate specific conductance, salinity, and total dissolved solids (TDS).

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This sensor can be directly attached to the fully submersible MX801 model or connected via cable to the direct-read MX802 model, which allows data to be downloaded without removing the sensor from the water.

Features

4-Electrode Conductivity Sensor: Offers a wide measurement range, suitable for monitoring both freshwater and saltwater environments.
Centralized Sensor Placement: Ensures minimal impact from stilling wells or protective guards, enhancing measurement accuracy.
Compact Design: With a 1” diameter, it’s ideal for use in narrow wells, particularly when connected via cable to the MX802 model positioned above the well.
Fast Temperature Response: The temperature sensor is strategically placed near the tip for quick response times.
Durable Construction: Specially treated stainless steel components are designed to withstand saltwater conditions, ensuring long-term reliability.

Technical specifications

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

Calibrated 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

Sensor

Dimensions

2.5 cm (1 inch) diameter, 17.4 cm (6.87 inches) length

Weight

144 g

5.08 oz

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

Jeroen Smits

Manager Product- en Sector Specialists

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Hobo W-CT Conductivity Sensor

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