Hobo U24-001 – Onset

Conductivity fresh water data logger, offload data via the BASE-U-4 optic USB base station or the U-DTW-1 waterproof shuttle

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.
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.

This is a non-contact sensor provides long life and less measurement drift and it provides easy access to sensor for cleaning and shedding air bubbles. Via the HOBOware Pro software you enable the start/end-point calibration to compensate for any fouling and provides easy conversion to specific conductance and salinity. The USB optical interface provides high-speed, reliable data offload in wet environments and this data logger is compatible with the Hobo waterproof shuttle for easy and reliable data retrieval and transport.
This data logger operates in outdoor and water environments and the data logger supports the following measurements: conductivity/salinity and temperature.

Technical specifications

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

Conductivity extended ranges: low range: 0 to 2.500 µS/cm, full range: 0 to 15.000 µS/cm

Conductivity calibrated range - temperature range: 5° to 35°C

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

Specific conductance accuracy: low range: 3% of reading, or 5 µS/cm and full range: 3% of reading or 20 µS/cm

Temperature accuracy: 0,1°C at 25°C

Conductivity drift: less than 3% sensor drift per year, exclusive of drift from fouling

Operating range: -2° to 36°C - 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

Battery: 3,6 Volt lithium battery

Battery life: 3 years (at 1 minute logging)

Maximum depth: 70 meters

CheckOptional with calibration

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