HOBO Dissolved Oxygen Data Logger
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Overview
An affordable, precise data logger that measures oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waters. Recommended for aquatic biology and hydrology research projects, this easy-to-maintain logger uses RDO® Basic (Rugged Dissolved Oxygen) optical DO sensor technology.
The HOBO U26 Dissolved Oxygen logger was part of a multi-year evaluation of DO loggers and sensors by the Alliance for Coastal Technologies (ACT), the results of which are published here. This un-biased report describes how the HOBO U26 performs in lab and field conditions. Note that our response letter, with added recommendations, is attached at the end of the report (pages 58-59).
Features
- Affordable, high performance dissolved oxygen (DO) monitoring with 0.2 mg/L accuracy
- Optical DO sensor technology for long-lasting calibration with less maintenance
- HOBOware Pro's Dissolved Oxygen Assistant software corrects for measurement drift from fouling; provides salinity-adjusted DO concentrations and percent saturation
- Optical USB interface for high-speed, reliable data offload
- User-replaceable DO sensor cap eliminates need to send logger back to the factory to replace membrane
NOTE: For DO measurements in saltwater, an adjustment for salinity is required. For waters with small changes in salinity (<2 ppt), a salinity meter reading typically provides enough accuracy. For environments with greater salinity changes, we generally recommend the HOBO U24-002-C Conductivity logger. If you need DO in Percent Saturation, barometric pressure data is required, which can be logged with a HOBO U20-001-04 Water Level logger.
Specifications
Dissolved Oxygen
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Optical
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0 to 30 mg/L
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0 to 20 mg/L; 0 to 35°C (32 to 95°F)
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± 0.2 mg/L up to 8 mg/L; ± 0.5 mg/L from 8 to 20 mg/L
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0.02 mg/L
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To 90% in less than 2 minutes
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6 months, cap expires 7 months after initialization
Temperature
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-5 to 40°C (23 to 104°F); non-Freezing
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0.2°C (0.36°F)
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0.02°C (0.04°F)
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To 90% in less than 30 minutes
Logger
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21,700 sets of DO and temperature measurements (64 KB total memory)
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1 minute to 18 hours
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±1 minute per month at 0 to 50°C (32 to 122°F)
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3.6 V lithium battery; factory replaceable
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3 years (at 5 minute logging)
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Optical
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100 m (328 ft)
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Salt water: 13 g (0.46 oz) negative | Fresh water: 20 g (0.71 oz) negative
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Black Delrin®, PVC, EPDM o-rings, silicone bronze screws; rated for saltwater use
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39.6 mm diameter x 266.7 mm length (1.56 x 10.5 inches)
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272.4 g (9.61 oz)
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IP68
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