onsetcomp com 42onsetcomp com HOBO U24 Series Conductivity Loggers Key Advantages Non contact capacitive sensor provides long life Easy access to sensor for cleaning and shedding air bubbles HOBOware Pro software provides compensation for fouling using calibration points from the start and end of each deployment Optical interface provides high speed reliable data offload in wet environments Compatible with HOBO Waterproof Shuttle for easy and reliable data retrieval HOBO Conductivity Loggers are convenient rugged and cost effective data loggers for a variety of freshwater and saltwater monitoring applications The HOBO U24 001 model provides high accuracy conductivity data in freshwater environments for applications such as environmental impact monitoring stormwater management and water quality studies The HOBO U24 002 C model is for saltwater environments with relatively small changes in salinity 5 000 µS cm such as saltwater bays or to detect salinity events such as upwelling rainstorm and discharge events This logger can also be used to gather salinity data for salinity compensation of HOBO U26 Dissolved Oxygen logger data Note This logger is not intended for monitoring salinity levels in waters with widely changing salinities as it can have significant measurement error and drift in those environments Supported Measurements Conductivity Salinity Temperature Conductivity monitoring for freshwater and stable saltwater applications For complete information and accessories please visit www onsetcomp com Part number U24 001 Conductivity U24 002 C Conductivity Salinity Memory 18 500 temperature and conductivity measurements when using one conductivity range 14 400 sets of measurements when using both conductivity ranges 64 kbytes Conductivity Calibrated Measurement Ranges Low Range 0 to 1 000 μS cm Full Range 0 to 10 000 μS cm Low Range 100 to 10 000 μS cm High Range 5 000 to 55 000 μS cm Conductivity Calibrated Range Temperature Range 5 to 35 C 41 to 95 F Specific Conductance Accuracy in Calibrated Range using Conductivity As sistant and Calibration Measurements Low Range 3 of reading or 5 μS cm Full Range 3 of reading or 20 μS cm whichever is greater Low Range 3 of reading or 50 µS cm whichever is greater High Range 5 of reading in waters within a range of 3 000 µS cm waters with greater variation can have substantially greater error Conductivity Resolution typical 1 μS cm 2 μS cm Conductivity Drift Less than 3 sensor drift per year Up to 12 sensor drift per month Use monthly start end point calibration to compensate Temperature Accuracy 0 1 C 0 2 F at 25 C 77 F Temperature Resolution 0 01 C 0 02 F Response Time 1 second to 90 of change in water Measurement and Operating Range 0 to 36 C 32 to 97 F non freezing 2 to 36 C 28 to 97 F non freezing Sample rate 1 second to 18 hrs fixed or multiple rate sampling with up to 8 user defined sampling intervals Time Accuracy 1 minute per month Battery 3 6 Volt lithium battery life 3 years at 1 minute logging typical Maximum Depth 70 m 225 ft Dimensions 3 18 cm diameter x 16 5 cm with 6 3 mm mounting hole 1 25 in diameter x 6 5 in hole CE compliant Yes HOBO Base Station or HOBO Waterproof Shuttle required See page 56 for more details 1Coupler included with HOBO Base Station or HOBO Waterproof Shuttle Minimum System Requirements Coupler1Base Station See pg 56 Software See pg 45

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