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An economical but accurate data logger, the HOBO U26 is ideal for aquatic biology and hydrology research projects. Oxygen concentrations can be measured in a myriad of locations: lakes, rivers, coastal waters, streams, and estuaries. The logger utilizes RDO (Rugged Dissolved Oxygen) optical DO sensor technology and is effortless to maintain.
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 .
NOTE: 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).
IMPORTANT: This HOBO data logger requires HOBOware Pro software and a communications device.
Includes:
- U26-001 data logger
- DO sensor cap
- Protective Guard
- Calibration Boot with sponge
| 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) | |
| 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) | |
 | The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). | |
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Environment: The U26-001 Data Logger is for use in Underwater environments
Measurements: The U26-001 Data Logger supports the following measurements: Temperature, Dissolved Oxygen
