HOBO Saltwater Conductivity and Salinity Data Logger
- Non-contact Sensor Minimizes Drift-Related Measurement Errors
- Also Features Open Access to Sensor for Cleaning and Software-Based Drift Compensation
- Software Enables Start/End-Point Calibration to Compensate for Fouling and Easy Conversion to Specific Conductance and Salinity
- 5,000 to 55,000 µS/cm (Conductivity Extended Range) and 5°C to 35°C (Temp) Measurement Ranges
- 3 Year Battery Life with Factory Replaceable Battery
- Stores at Least 14,400 Sets of Measured Readings
- Requires HOBOware Pro Software Download (Version 3.2+)
Designed for Saltwater Sources. See the U24-001 for Fresh Water Sources
Overview of the HOBO U24-002-C Salinity, Conductivity, & Temp Data Logger
The Onset HOBO U24-002-C is a cost-effective data logger designed to measure salinity, conductivity, and temperature in saltwater environments. This is an ideal solution for monitoring relatively small changes in salinity (±5,000 μS/cm) such as in saltwater bays, or to detect salinity events, such as upwelling, rainstorm, or discharge events. When combined with data from the HOBO U26 Dissolved Oxygen logger you can monitor percent dissolved oxygen saturation. Downloading the logger can be done in less than 30 seconds using the required optical USB interface (BASE-U-4 or U-DTW-1). The logger is configured, and data is viewed using either free HOBOware or HOBOware Pro (paid) software.
Note: For monitoring salinity in waters with more than ±5,000 μS/cm variation, we recommend the U24-001 for its increased accuracy.
Onset HOBO® U24-002-C Saltwater Conductivity Data Logger Specifications
| Data Channels | 2 Channels (Conductivity or Salinity and Temperature) |
| Conductivity (Salinity) |
Calibrated Low Range: 100 to 10,000 µS/cm @ 5°C to 35°C) Calibrated Full Range: 5,000 to 55,000 µS/cm @ 5°C to 35°C) Resolution: 2 µS/cm Accuracy (Low Range): 3% of Reading, or 50 µS/cm Accuracy (High Range): 5% of Reading* Drift: Up to 12% per month in saltwater (exc. drift from fouling) * In waters within a range of 3,000 µS/cm |
| Temperature | Measurement Range: 5°C to 35°C (41°F to 95°F) Resolution: 0.01°C (0.02°F) Accuracy: 0.1°C (0.2°F) |
| Response Time | 1 second to 90% of Change (In Water) |
| Data Storage Capacity | 1 Conductivity Range: 18,500 Measurement Readings 2 Conductivity Ranges: 14,400 Measurement Readings |
| Sampling Rate | 1 Second to 18 Hours (User-Specified) Up to 8 Sampling Intervals User-Defined |
| Operating Range | Temperature: -2°C to 36 °C (28°F to 97°F) - Non-Freezing |
| Battery | 3.6 Volt Lithium Battery - Factory Replaceable Only |
| Battery Life | 3 Years @ 1 Minute Sampling Rate (Dependant Upon Environment and Operating Range) |
| Maximum Depth | 70 Meters (225 feet) |
| Sample & Event Logging | Samples: Recorded Sensor Measurements Events: Logger Activity (ie: Bad Battery, Host Connected) |
| Wetted Housing Materials | Delrin, Epoxy, Stainless Steel Retaining Ring, Polypropylene, Buna Rubber O-Ring, Titanium Pentoxide (Inert Coating Over Sensor) Note: All Materials Are Suitable for Long-Term use in Saltwater |
| Communications | USB optical Interface for Downloading Data. Requires Base Station (U-DTW-1 or BASE-U-4) |
| Software Compatibility | HOBOware PRO Version 3.2+ |
| OS Compatibility | Windows: Windows 10, 8.1, 8 and 7 Mac: OS X 10.9.x, 10.10.x and 10.11.x |
| Standards Compliance | CE |
| Weight | 193 grams (6.82 oz.) Buoyancy in Freshwater: -59.8gm (-2.11 oz.) |
| Dimensions | 3.18cm x 16.5cm (1.25" x 6.5") Mounting Hole: 6.3mm (0.25") |
