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  • U26-001
  • U26-001
  • U26-001
  • U26-001
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HOBO Dissolved Oxygen Data Logger

Part # U26-001
 
 

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HOBO data loggers requires HOBOware software (USB interface cable included w/CD purchase) and a communications device. HOBOware Pro is required when using the U-DTW-1 Waterproof shuttle. See compatible items below.

Overview

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.

Includes:

  • U26-001 data logger
  • DO sensor cap
  • Protective Guard
  • Calibration Boot with sponge

Our 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 just been published online. This provides an un-biased 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.

Click here to read.

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
  • 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

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.

Includes:

  • U26-001 data logger
  • DO sensor cap
  • Protective Guard
  • Calibration Boot with sponge

Our 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 just been published online. This provides an un-biased 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.

Click here to read.

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
  • 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

The country of origin for this product is the United States. To see the full specifications for this product, please see our product manual found under the documentation tab if available.

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)
  Description: ce The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

 

    • HOBO U26-001 Dissolved Oxygen Data Logger
    • Dissolved oxygen sensor cap
    • Protective guard
    • Calibration boot and sponge

The following are associated resources for this product. In general users of this product can gain insight into its possible use by utilizing the resources below. Our user forum can also be a valuable resource for questions, use cases and general feedback. Share with us today, here!

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NOTE: Couplers are included for compatibility with our U-series loggers with optical communication, including the UA Pendants, U20 water level, U22 Water Temp Pro, UTBI TidbiT, U23 Pro Temp/RH, U24 Conductivity and U26 DO data loggers.

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U24-002-C

The HOBO U24-002-C is a cost-effective data logger for measuring salinity, conductivity and temperature in saltwater environments with relatively small changes in salinity (±5,000 μS/cm) such as saltwater bays, or to detect salinity events such as upwelling, rainstorm, and discharge events. It can also be used to gather salinity data for salinity compensation of HOBO U26 Dissolved Oxygen logger data.

Note: When monitoring salinity in waters with more than +/-5,000 uS/cm variation, refer to the accuracy shown in Plot C in the product specifications to determine if the accuracy is acceptable for your needs. Monthly field calibration readings are typically required to achieve the best accuracy.

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The Anti-fouling Protective Guard can be used in place of the standard protective guard for protection against fouling during deployment. The anti-fouling guard uses copper windings to reduce bio-fouling, while still allowing good water flow to the sensor.

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The Replacement DO Sensor Cap replaces the original DO sensor cap that’s included with the HOBO DO Data Logger. The DO sensor caps have a 6-month deployment life. (The caps expire 7 months after initialization to allow some time before and after the deployment.) The caps have a 2-year shelf-life from the date they were manufactured. (Shelf-life shown on the canisters the caps come in.)

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