HOBO Freshwater Conductivity and Salinity Data Logger
- Non-contact Sensor Minimizes Drift-Related Measurement Errors
- 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
- 0 to 15,000 µS/cm (Conductivity Extended Range) and 0°C to 40°C (Temperature) Measurement Ranges
- 3 Year Battery Life with Factory Replaceable Battery
- Stores at Least 14,400 Sets of Measured Readings
- Requires HOBOware Pro Software (Version 3.2+) and BASE-U-4 Optical Base Station
Designed for Fresh Water Sources. See the Onset U24-002-C for Saltwater Sources
Overview of the HOBO U24-001 Conductivity Data Logger
The Onset HOBO U24-001 is a cost-effective, high-accuracy conductivity data logger for collecting freshwater water quality data. The U24 is designed to record both conductivity and temperature in streams, lakes, and other freshwater sources. This is an ideal solution for monitoring aquifers for saltwater intrusion and road and agricultural runoff. The U24 has open access to its sensor which makes cleaning and maintenance very easy. The loggers non-contact sensor keeps measurement errors due to drift to an absolute minimum. Additionally, the logger features software-based drift compensation. The sensor on the U24 has a Titanium Pentoxide coating which prevents the sensor from coming into contact with water. This, in turn, prevents tarnishing or corrosion associated with traditional electrode sensors. The sensor coating is also inert, enabling any fouling to be easily wiped off. 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.
Onset HOBO® U24-001 Freshwater Conductivity Data Logger Specifications
| Data Channels | 2 Channels (Conductivity or Salinity and Temperature) |
| Conductivity (Salinity) |
Calibrated Low Range: 0 to 1,000 µS/cm Calibrated Full Range: 0 to 10,000 µS/cm Extended Low Range: 0 to 2,500 µS/cm Extended Full Range: 0 to 15,000 µS/cm Resolution: 1 µS/cm Accuracy (Calibrated Range): 3% of Reading, or 5 µS/cm |
| Temperature | Calibrated Range: 5°C to 40°C (41°F to 104°F) Extended Range: 0°C to 40°C (32°F to 104°F) Resolution: 0.01°C (0.02°F) Accuracy: 0.1°C (0.2°F) |
| Response Time | 1 second to 90% of Change |
| 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: 0°C to 50°C (32°F to 122°F) - Non-Freezing |
| Battery | 3.6 Volt Lithium Battery - Factory Replaceable |
| 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) |
| Communications | USB optical Interface for Downloading Data. Requires Base Station (U-DTW-1 or BASE-U-4) |
| Wetted Housing Materials | Delrin, Epoxy, Stainless Steel, Polypropylene, Buna Rubber O-Ring, Titanium Pentoxide (Sensor) |
| Software Compatibility | HOBOware PRO Version 3.2+ |
| OS Compatibility | Windows: Windows 11, 10 and 7 (32 and 64-Bit) 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") |
