HOBO Conductivity Data Logger - U24-002

The HOBO U24-002 Conductivity/Salinity Logger is a high-accuracy, cost-effective data logger for measuring salinity, conductivity and temperature in saltwater environments such as bays and estuaries. The logger significantly reduces the cost of conductivity/salinity monitoring while making logger maintenance easier than ever.

Measurements: Actual Conductivity, Temperature, Specific Conductance at 25C (calculated), Salinity (calculated using PSS-78, the Practical Salinity Scale 1978)

Conductivity Measurement Range: (Calibrated Range)
High Range: 5000 to 65,000 uS/cm
Low Range: 100 to 10,000 uS/cm
Over the range of 5 to 35C (41 to 95F)

Temperature Measurement Range: -2 to 36C (28 to 97F)

Plot A: Salinity Range (U24-002)*	Plot B: Specific Conductance Range in Saltwater
Plot C: Comparison of Conductivity Calibrated Measurement Ranges	Plot D: Specific Conductance High-Range Accuracy (U24-002)

Accuracy:
Specific Conductance Accuracy (in Calibrated Range): 3% of reading, or 50 µS/cm, whichever is greater for up to 50,000 µS/cm, using Conductivity Data Assistant and calibration measurements, and up to 10% for up to 65,000 µS/cm in NaCl solutions (see Plot D)
Temperature: 0.01°C (0.02°F) (in calibrated range)

Resolution:
Conductivity: 2 uS/cm
Temperature: 0.01°C (0.02°F)

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

Response time: 1 second to 90% of change (in water)

Operating Range: -2 to 36C (28 to 97F) – non-freezing

Memory: 18,500 temperature and conductivity measurements when using one conductivity range; 14,400 sets of measurements when using both conductivity ranges (64kbytes)

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 life: 3 years (@ 1 min logging)

Maximum Depth: 70 m (225')

Weight: 193 gm (6.82 ounces), buoyancy in freshwater: -59.8 gm (-2.11 ounces)

Size: 3.18 cm diameter x 16.5 cm, with 6.3 mm mounting hole (1.25" diameter x 6.5", ¼" hole)

Wetted Housing Materials: Delrin housing, epoxy, stainless steel retaining ring, polypropylene, Buna rubber O-ring, titanium pentoxide (inert coating over sensor) – all materials are suitable for long-term use in saltwater.

CE Compliance: The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).