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Measure oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waters with the HOBO U26 Dissolved Oxygen Logger. This affordable and precise 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.
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 Logger (U20-001-04).
IMPORTANT: The Hobo software and base unit need to be purchased with this logger. HOBOware Pro's Dissolved Oxygen Assistant software corrects for measurement drift from fouling; provides salinity-adjusted DO concentrations and percent saturation
Please order via the Recommended products area (below).
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) | |
Measure oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waters with the HOBO U26 Dissolved Oxygen Logger. This affordable and precise 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.
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 Logger (U20-001-04).
IMPORTANT: The Hobo software and base unit need to be purchased with this logger. HOBOware Pro's Dissolved Oxygen Assistant software corrects for measurement drift from fouling; provides salinity-adjusted DO concentrations and percent saturation
Please order via the Recommended products area (below).
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) | |
