The HOBO U24-002-C is a cost-effective data logger for measuring salinity, conductivity and temperature in 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. It can also be used to gather salinity data for salinity compensation of HOBO U26 Dissolved Oxygen logger data.

Note: When monitoring salinity in waters with more than +/-5,000 uS/cm variation, refer to the accuracy shown in Plot C in the product specifications to determine if the accuracy is acceptable for your needs. Monthly field calibration readings are typically required to achieve the best accuracy.

• Non-contact sensor provides long life
• Provides easy access to sensor for cleaning and shedding air bubbles
• Two user-selectable ranges provide measurements from 100 to 55,000 uS/cm.
• The Delrin housing will not corrode in saltwater
• HOBOware Pro software enables start/end-point calibration to compensate for any fouling and provides easy conversion to specific conductance and salinity using the Practical Salinity Scale 1978 (PSS-78)
• USB optical interface provides high-speed, reliable salinity data offload in wet environments
• Compatible with the HOBO Waterproof Shuttle for easy and reliable data retrieval and transport

Includes:

• (1) Saltwater Conductivity Data Logger,Communications window protective cap, Onset BASE-U-4 Optic USB Base Station, BHW-PRO-CD HOBOware PRO v.3.x for PC & Mac

Specifications:

• Data Channels: 2 Channels (Conductivity or Salinity and Temperature)
• Conductivity (Salinity):  Calibrated Low Range: 100 to 10,000 µS/cm @ 5°C to 35°C);Calibrated Full Range: 5000 to 5,000 µS/cm @ 5°C to 35°C); Resolution: 2 µS/cm; Accuracy (Low Range): 3% of Reading, or 50 µS/cm; Accuracy (High Range): 5% of Reading*; Drift: Up to 12% per month in saltwater (exc. drift from fouling).* In waters within a range of 3,000 µS/cm
• Temperature:   Measurement Range: 5°C to 35°C (41°C to 95°F); Resolution: 0.01°C (0.02°F); Accuracy: 0.1°C (0.2°F)
• Response Time:    1 second to 90% of Change (In Water)
• Data Storage Capacity:    1 Conductivity Range: 18,500 Measurement Readings; 2 Conductivity Ranges: 14,400 Measurement Readings
• Sampling Rate:   1 Second to 18 Hours (User-Specified); Up to 8 Sampling Intervals User-Defined
• Operating Range:    Temperature: -2°C to 36 °C (28°F to 97°F) - Non-Freezing
• Battery:    3.6 Volt Lithium Battery - Factory Replaceable Only
• Battery Life:   3 Years @ 1 Minute Sampling Rate (Dependant Upon Environment and Operating Range)
• Maximum Depth:    70 Meters (225 feet)
• Sample & Event Logging:    Samples: Recorded Sensor Measurements; Events: Logger Activity (ie: Bad Battery, Host Connected)
• Wetted Housing Materials:    Delrin, Epoxy, Stainless Steel Retaining Ring, Polypropylene, Buna Rubber O-Ring, Titanium Pentoxide (Inert Coating Over Sensor).Note: All Materials Are Suitable for Long-Term use in Saltwater
• Communications:    USB optical Interface for Downloading Data. Requires Base Station (U-DTW-1 or BASE-U-4)
• Software Compatibility:    HOBOWare Pro Version 3.2+
• OS Compatibility:    Windows: Windows 8, 7, Vista and XP (32-Bit and 64-Bit);Mac: OS X 10.6.x, 10.7.x and 10.8.x
• Standards Compliance:    CE
• Weight:   193 grams (6.82 oz.)
• Buoyancy in Freshwater: -59.8gm (-2.11 oz.)
• Dimensions:    3.18cm x 16.5cm (1.25" x 6.5")
• Mounting Hole: 6.3mm (0.25")