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HOBO U26 - Dissolved Oxygen Data Logger

Manufacturer:
The HOBO U26 Dissolved Oxygen Logger is a highly precise, low-cost data logger for measuring concentrations of oxygen in lakes, streams, rivers, estuaries, and coastal waters. Used by aquatic biologists, hydrologists, and other research professionals, 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.
Part Number: U26-001
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$3,174.00 ex GST
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Monitor Dissolved Oxygen Without the Hassle of Constant Calibration 

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.


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.


Important Information

Requires HOBOware Pro software and either a U-DTW-1 Waterproof Shuttle or the Base-U-4 Optic USB Base Station for configuration and data offload. 

HOBO Dissolved Oxygen Data Logger U26

Learn the features of this dissolved oxygen logger, which measures both dissolved oxygen and temperature. Specs covered include RDO sensor technology calibration, accuracy rating, and six-month cap-life. More details regarding anti-fouling guard, housing for fresh or salt water, and waterproof shuttle are coverd. Battery details, optical communications for underwater offloading, and HOBOware Pro software compatibility are also discussed.


Technical Information 

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 

Temperature Measurement/Operating 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 (64 KB total memory)
Logging Rate 1 minute to 18 hours
Time Accuracy ±1 minute per month at 0 to 50°C (32 to 122°F)
Battery 3.6 V lithium battery; factory replaceable
Battery Life 3 years (at 5 minute logging)
Download Type Optical
Depth Rating 100 m (328 ft)
Buoyancy Salt water: 13 g (0.46 oz) negative | Fresh water: 20 g (0.71 oz) negative
Wetted Materials Black Delrin®, PVC, EPDM o-rings, silicone bronze screws; rated for saltwater use
Size 39.6 mm diameter x 266.7 mm length (1.56 x 10.5 inches)
Weight 464 g (16.37 oz)
Environmental Rating IP68
CE The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

Monitor Dissolved Oxygen Without the Hassle of Constant Calibration 

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.


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.


Important Information

Requires HOBOware Pro software and either a U-DTW-1 Waterproof Shuttle or the Base-U-4 Optic USB Base Station for configuration and data offload. 

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