Dissolved Oxygen Data Logger
Measure oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waters with the HOBO U26 Dissolved Oxygen Data Logger. This affordable and precise data logger is recommended for aquati..
- Brands ONSET
- Product Code: U26-001
- Availability: 7-10 Days
Tags: oxygen, temperature, logger underwater, u26, coastal
Dissolved Oxygen Data Logger
Measure oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waters with the HOBO U26 Dissolved Oxygen Data Logger. This affordable and precise data logger is recommended for aquatic biology and hydrology research projects. The HOBO U26 uses RDO Basic (Rugged Dissolved Oxygen) optical DO sensor technology and is easy to maintain.
The HOBO U26 Dissolved Oxygen logger has been part of a multi-year evaluation of DO loggers and sensors by the Alliance for Coastal Technologies (ACT), and the results have been published online. This provides an unbiased report of how our U26 performs in lab and field conditions. Note that our response letter with our added recommendations is attached at the end of this report on pages 58 and 59.
Highlighted 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
- An optical USB interface for high-speed, reliable data offload
- Easy-to-replace DO sensor cap lasts six months
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 Water Level Data Logger (U20-001-04).
In what environment does this data logger operate?
This data logger operates in an underwater environment.
What measurements does this data logger support?
The U26-001 data logger supports the following measurements: Dissolved Oxygen and Temperature
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- HOBO U26-001 Dissolved Oxygen Data Logger
- Dissolved oxygen sensor cap
- Protective guard
- Calibration boot and sponge
| Dissolved Oxygen | |
| Dissolved Oxygen Response Time | To 90% in less than 2 minutes |
| Dissolved Oxygen Accuracy | ± 0.2 mg/L up to 8 mg/L; ± 0.5 mg/L from 8 to 20 mg/L |
| Dissolved Oxygen Resolution | 0.02 mg/L |
| Dissolved Oxygen Sensor Cap Life | 6 months, cap expires 7 months after initialization |
| Sensor Type | Optical |
| Enclosure | |
| Enclosure Material | Black Delrin®, PVC, EPDM o-rings, silicone bronze screws; rated for saltwater use |
| Logger | |
| Depth Rating | 100 m (328 ft) |
| Download Type | Optical |
| Logger Battery Life | 3 years (@ 5 minute logging) |
| Logger Battery Type | 3.6 V lithium battery; factory replaceable |
| Logger Dimensions | 39.6 mm diameter x 266.7 mm length (1.56 x 10.5 inches) |
| Logger Environmental Rating | IP68 |
| Logger Memory | 21,700 sets of DO and temperature measurements (64 KB total memory) |
| Logger Time Accuracy | ±1 minute per month at 0 to 50°C (32 to 122°F) |
| Logger Weight | 464 g (16.37 oz) |
| Logging Rate | 1 minute to 18 hours |
| Safety and Regulatory | |
| Safety and Regulatory CE | The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). |
| Temperature Sensor | |
| Temperature Sensor Accuracy | 0.2°C (0.36°F) |
| Temperature Sensor Range | -5 to 40°C (23 to 104°F); non-Freezing |
| Temperature Sensor Resolution | 0.02°C (0.04°F) |
| Temperature Sensor Response Time | To 90% in less than 30 minutes |
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