onsetcomp com43 onsetcomp com Key Advantages Affordable high performance DO monitoring Optical DO sensor technology for long lasting calibration less maintenance Software corrects for measurement drift from fouling provides salinity adjusted DO concentration and percent saturation Salinity adjustment requires salinity meter reading or data logger file Percent saturation requires barometric pressure data file Optic USB interface for high speed reliable data offload Easy to replace DO sensor cap lasts six months The HOBO U26 Dissolved Oxygen Logger measures concentrations of dissolved oxygen in lakes streams rivers estuaries and coastal waters Used by aquatic biologists hydrologists and other research professionals to monitor water quality the U26 is ideal for climate change and environmental impact studies as well as ecological and oceanographic research The HOBO U26 combines the high accuracy robust performance of industry leading RDO Basic Rugged Dissolved Oxygen sensor technology with an easy to maintain design all at a fraction of the cost of other monitoring options Supported Measurements Dissolved Oxygen Temperature For complete information and accessories please visit www onsetcomp com Part number U26 001 Dissolved Oxygen Sensor Type Optical Measurement Range 0 to 30 mg L Calibrated Range 0 to 20 mg L 0 to 35 C 32 to 95 F Accuracy 0 2 mg L up to 8 mg L 0 5 mg L from 8 to 20 mg L Resolution 0 02 mg L Response time To 90 in less than 2 minutes DO Sensor Cap Life 6 months cap expires 7 months after initialization Temperature Operating Temperature and Measurement Range 5 to 40 C 23 to 104 F non freezing Temperature Accuracy 0 2 C 0 36 F Temperature Resolution 0 02 C 0 04 F Response Time To 90 in less than 30 minutes Logger Memory 21 700 sets of DO and temperature measurements Logging Rate 1 minute to 18 hours Time Accuracy 1 minute per month at 25 C 77 F Battery 3 6 V lithium battery factory replaceable life 3 years at 1 minute logging Maximum Depth 100 m 328 ft Dimensions 39 6 mm diameter x 266 7 mm 1 56 in diameter x 10 5 in 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 Affordable high performance dissolved oxygen monitoring HOBO U26 Dissolved Oxygen Logger Minimum System Requirements Coupler1Base Station See pg 56 Software See pg 45

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