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Part Number -
U26-001
HOBO Dissolved Oxygen Data Logger
$1,499.00 USD
An affordable, precise data logger that measures oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waters.
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. Please see compatible items below.
Try a New MX800 Bluetooth DO Logger!
2-year Cap Life + User-Replaceable Batteries & More!
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
Sensor Type
Measurement Range
Calibrated Range
Accuracy
Resolution
Response Time
DO Sensor Cap Life
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
Temperature Measurement/Operating Range
Temperature Accuracy
Temperature Resolution
Response Time
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
Memory
Logging Rate
Time Accuracy
Battery
Battery Life
Download Type
Depth Rating
Buoyancy
Wetted Materials
Size
Weight
Environmental Rating
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Compatible items
Antifouling Protective Guard
Data Offload - Base Stations - Shuttles - Couplers
Stainless Steel Cable/Crimps
Well Caps
Compliance Certificates
Accessories
Calibration Solution
Coupler
Replacement Parts
Graphing & Analysis
What's in the box
- HOBO U26-001 Dissolved Oxygen Data Logger
- Dissolved oxygen sensor cap
- Protective guard
- Calibration boot and sponge
Resources
Customers Also Bought
Communication
HOBO Waterproof Shuttle
Provides convenient readout and relaunching of underwater and outdoor HOBO data loggers with an Optic USB interface, and is waterproof to 20m (66ft). Can also be used as a base station.
Data Logger
HOBO Saltwater Conductivity/Salinity Data Logger
A cost-effective data logger for measuring salinity, conductivity, and temperature in saltwater environments with relatively small changes in salinity (±5,000 μS/cm).
Accessory
Antifouling Protective Guard
Can be used in place of the standard protective guard for U26 loggers or the MX800 series dissolved oxygen sensor, to protect against fouling during deployment.
Replacement
Replacement DO Sensor Cap - U26-RDOB-1
Replaces the original DO sensor cap that’s included with the HOBO DO Data Logger.