Onset W-CTD-04

Our Part No. WCTD04

Mfr. Model W-CTD-04

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Onset W-CTD-04

Our Part No. WCTD04

Mfr. Model W-CTD-04

The Onset W-CTD-04 HOBO Conductivity/Temperature/Depth Sensor is designed for use with the HOBO MX800 Series Water Data Loggers (not included). The W-CTD-04 works with the HOBO MX800 Series Water Data Loggers to measure conductivity, temperature, and water level.

Depth Range: Up to 4m (13 ft.)
Centrally located conductivity sensor minimizes effects from stilling wells/protective guards
Temperature sensor placement near tip for fast response time

This product is available for shipping to the US, Canada, and Puerto Rico only.

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Key Features

Compatibility: HOBO MX800 Series Water Data Loggers
4-electrode conductivity sensor provides wide measurement range for monitoring freshwater/saltwater
Conductivity sensor is centrally located to minimize effects from stilling wells, protective guards
Durable ceramic water level sensor located in sensor tip for accurate measurement of shallow water levels
Receive water level results directly from MX802, no need for post-processing
1 in. diameter for use in narrow wells (with cable to MX802 above well)
Temperature sensor placement near sensor tip for fast response time
Specially treated stainless steel holds up in saltwater

Specifications

Conductivity Measurements

Measurement Range

Electrical Conductivity/Specific Conductance: 0 to 100,000 µS/cm
Salinity (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
Temperature: 5°C to 35°C (41°F to 95°F)

Accuracy

Conductivity: +/-2% of reading / 15 µS/cm, whichever is greater
Salinity: +/-2% of reading / 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
TDS: 0.1 mg/L
Salinity: 0.01 PSU
Response Time: 1 second to 90% at stable temperature

Absolute Pressure/Water Level Measurements

Range: 0 to 145 kPa (0 to 21 psia), approximately 0 to 4m (0 to 13 ft.) of water depth at sea level, 0 to 7m (0 to 23 ft.) of water at 3,000m (10,000 ft.) of altitude
Factory Calibration Range: 69 to 145 kPa (10 to 21 psia), 0°C to 40°C (32°F to 104°F)
Burst Pressure: 310 kPa (45 psia)/18m (60 ft.) depth
Water Level Accuracy: ±0.075% FS, 0.3 cm (0.01 ft.) water (typical error), ±0.15% FS, 0.6 cm (0.02 ft.) water (maximum error)
Raw Pressure Accuracy: ±0.3% FS, 0.43 kPa (0.063 psi) maximum error
Resolution: Less than 0.014 kPa (0.002 psi), 0.14 cm (0.005 ft.) water
Pressure Response Time: Less than 1 second to 90% at stable temperature

Temperature Measurements

Range: -20°C to 50°C (-40°F to 122°F), non-freezing water
Accuracy: ±0.15°C (±0.27°F) from 0°C to 50°C (32°F 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: Less than 0.1°C (0.18°F) per year

Sensor

Dimensions: 2.5 cm (1 in.) diameter, 15 cm (6 in.) length
Wetted Materials: Passivated 316 stainless steel housing rated for use in saltwater, Viton, Buna-N O-rings, PET sensor connector
Depth Sensor: Ceramic
Conductivity Sensor: PET, platinum plating on electrodes
Sensor should be mounted/not in contact with other metals
Environmental Rating: IP68, waterproof to pressure sensor burst pressure rating

Details

The Onset W-CTD-04 Conductivity/Temperature/Depth Sensor is designed for use with the HOBO MX800 Series Water Data Loggers (not included). Along with the data logger, this unit requires the HOBOconnect app and a compatible mobile device or Windows computer for full usage.

The W-CTD-04 is an interchangeable sensor that works with HOBO MX800 Series Water Data Loggers to measure conductivity, temperature, and water level. With this sensor attached to a HOBO MX800 Series Water Data Logger, the logger can calculate specific conductance, salinity, and total dissolved solids (TDS).

The W-CTD-04 can be directly attached directly to the fully submersible MX801 model. Additionally, this unit can be attached via cable to the direct read MX802 model which does not require having to pull the sensor out of the water to download recorded data.

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