Onset HOBO Fresh Water Conductivity Logger

The Onset HOBO U24 measures and records both conductivity and temperatures in streams, lakes, and other freshwater sources.

Features

  • Non-contact sensor provides long life and less measurement drift
  • Provides easy access to sensor for cleaning and shedding air bubbles
  • Requires HOBOware Pro Software and optic base station or waterproof shuttle
$985.00
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Overview
The Onset HOBO U24 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. The Onset HOBO U24 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 U24’s non-contact sensor minimizes measurement errors related to drift and features software-based drift compensation.

Low-Maintenance
The HOBO U24 Conductivity data logger features a non-contact sensor with a Titanium Pentoxide coating. This coating prevents the sensor from coming in contact with the water, which in turn prevents tarnishing or corrosion associated with traditional electrode sensors. This sensor coating is also inert, enabling fouling to be easily wiped off the sensor.

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
  • HOBO U24-001 Conductivity Data Logger
  • Communications window protective cap
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Onset HOBO Fresh Water Conductivity Logger
U24-001
HOBO fresh water conductivity & temperature logger, 0 to 10,000 uS/cm range
$985.00
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