Onset HOBO U24-001 Fresh Water Conductivity Data Logger

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Onset HOBO U24-001 Fresh Water Conductivity Data Logger

  • Vendor:Onset

Availability: Available Item


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.


  • Titanium pentoixed coated non-contact sensor rovides 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

 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