This high-accuracy conductivity data logger is a cost-effective way to collect water quality data. The HOBO U24 measures and records both conductivity and temperatures in streams, lakes, and other freshwater sources. This logger is recommended for monitoring aquifers for saltwater intrusion and road and agricultural runoff. This product’s open access to its sensor simplifies cleaning and maintenance. The HOBO U24’s non-contact sensor minimizes measurement errors related to drift. In addition, the logger features software-based drift compensation.
This data logger operates in outdoor and underwater environments.
The U24-001 data logger supports the following measurements: Conductivity/Salinity and Temperature
| Measurements | Actual Conductivity, Temperature, Specific Conductance at 25°C (calculated) |
| Conductivity Calibrated Measurement Ranges | Low Range: 0 to 1,000 µS/cm Full Range: 0 to 10,000 µS/cm |
| Conductivity Calibrated Range – Temperature Range | 5° to 35°C (41° to 95°F) |
| Conductivity Extended Ranges | Low Range: 0 to 2,500 µS/cm Full Range: 0 to 15,000 µS/cm |
| Temperature Measurement Range | -2° to 36°C (28° to 97°F) |
| Specific Conductance Accuracy (in Calibrated Range) | Low Range: 3% of reading, or 5 µS/cm, and Full Range: 3% of reading, or 20 µS/cm, whichever is greater, using Conductivity Data Assistant and calibration measurements |
| Conductivity Resolution | 1 µS/cm |
| Temperature Accuracy | 0.1°C (0.2°F) at 25°C (77°F) |
| Temperature Resolution | 0.01°C (0.02°F) |
| Conductivity Drift | Less than 3% sensor drift per year, exclusive of drift from fouling |
| Response Time | 1 second to 90% of change (in water) |
| Operating Range | -2° to 36°C (28° to 97°F) – non-freezing |
| Memory | 18,500 temperature and conductivity measurements when using one conductivity range; 11,500 sets of measurements when using both conductivity ranges (64 KB total memory) |
| Sample Rate | 1 second to 18 hrs, fixed or multiple-rate sampling with up to 8 user-defined sampling intervals |
| Clock Accuracy | ±1 minute per month |
| Battery | 3.6 Volt lithium battery |
| Battery Life | 3 years (at 1 minute logging) |
| Maximum Depth | 70 m (225 ft) |
| Weight | 193 g (6.82 oz), buoyancy in freshwater: -59.8 g (-2.11 oz) |
| Size | 3.18 cm diameter x 16.5 cm, with 6.3 mm mounting hole (1.25 in. diameter x 6.5 in., 0.25 in. hole) |
| Wetted Housing Materials | Delrin®, epoxy, stainless steel retaining ring, polypropylene, Buna rubber O-ring, titanium pentoxide (inert coating over sensor) |
| Environmental Rating | IP68 |
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