Onset
HOBO Fresh Water Conductivity Data Logger
A high-accuracy, cost-effective data logger that measures and records conductivity and temperature in streams, lakes, and other freshwater sources. Recommended for monitoring aquifers for saltwater intrusion and road and agricultural runoff, this logger's open access to its sensor simplifies cleaning and maintenance, and its non-contact sensor minimizes measurement errors related to drift. Also features software-based drift compensation.
The titanium pentoxide coating on the non-contact sensor prevents it from coming into contact with the water, thereby preventing tarnishing or corrosion associated with traditional electrode sensors. This sensor coating is also inert, so fouling can be easily wiped off the sensor.
Documentation
Data SheetHighlighted Features
- Titanium pentoxide coated non-contact sensor provides long life and less measurement drift
- Provides easy access to sensor for cleaning and shedding air bubbles
- HOBOware Pro software enables start/end-point calibration to compensate for any fouling and provides easy conversion to specific conductance and salinity
- USB optical interface provides high-speed, reliable data offload in wet environments
- Compatible with the HOBO Waterproof Shuttle for easy and reliable data retrieval and transport
Specifications
| Measurement | Value |
|---|---|
| Conductivity | |
| Calibrated Measurement Ranges | Low Range: 0 to 1,000 µS/cm |
| Full Range: 0 to 10,000 µS/cm | |
| Calibrated Range - Temperature Range | 5° to 35°C (41° to 95°F) |
| Extended Ranges | Low Range: 0 to 2,500 µS/cm |
| Full Range: 0 to 15,000 µS/cm | |
| Accuracy | Low Range: 3% of reading, or 5 µS/cm, whichever is greater, using Conductivity Data Assistant and calibration measurements |
| Full Range: 3% of reading, or 20 µS/cm, whichever is greater, using Conductivity Data Assistant and calibration measurements | |
| Resolution | 1 µS/cm |
| Drift | Less than 3% sensor drift per year, exclusive of drift from fouling |
| Response Time | 1 second to 90% of change (in water) |
| Temperature | |
| Measurement Range | -2° to 36°C (28° to 97°F) |
| Accuracy | 0.1°C (0.2°F) at 25°C (77°F) |
| Resolution | 0.01°C (0.02°F) |
| Logger | |
| 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 |
Applications
In what environment does this data logger operate?
This data logger operates in outdoor and underwater environments.
What measurements does this data logger support?
The U24-001 data logger supports the following measurements: Conductivity/Salinity and Temperature