Onset U26-001 Specifications

HOBO® Dissolved Oxygen Logger

Affordable, high performance dissolved oxygen monitoring

The HOBO U26 Dissolved Oxygen Logger measures
concentrations of dissolved oxygen in lakes, streams, rivers,
estuaries, and coastal waters. Used by aquatic biologists,
hydrologists, and other research professionals to monitor water
quality, the U26 is ideal for climate change and environmental
impact studies as well as ecological and oceanographic
research.

The HOBO U26 combines the high-accuracy, robust
performance of industry-leading RDO® Basic (Rugged Dissolved
Oxygen) sensor technology with an easy-to-maintain design, all
at a fraction of the cost of other monitoring options.

Supported Measurements: Dissolved Oxygen, Temperature

Key Advantages:

• Affordable, high performance DO monitoring with 0.2 mg/L accuracy

• Optical DO sensor technology for long-lasting calibration, less maintenance

• Software corrects for measurement drift from fouling; provides salinity­ adjusted DO concentration and percent saturation (Salinity adjustment
requires salinity meter reading or data logger file. Percent saturation requires
barometric pressure data file.)

• Optic USB interface for high-speed, reliable data offload

• Easy-to-replace DO sensor cap lasts six months

Minimum System Requirements:

Software

Base Station

*

Coupler

1

*HOBO Base Station or HOBO Waterproof Shuttle required.

1

Coupler included with HOBO Base Station or HOBO Waterproof Shuttle.

For complete information and accessories, please visit: www.onsetcomp.com

Part number U26-001

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

Operating Temperature and
Measurement Range

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

Memory 21,700 sets of DO and temperature measurements

Logging Rate 1 minute to 18 hours

Time Accuracy ± 1 minute per month at 25°C (77°F)

Battery 3.6 V lithium battery; factory replaceable, life: 3 years (at 1 minute logging)

Maximum Depth 100 m (328 ft)

Dimensions 39.6 mm diameter x 266.7 mm (1.56 in diameter x 10.5 in)

CE Compliant Yes

-5 to 40°C (23 to 104°F), non-freezing

Logger

Contact Us

Sales (8am to 5pm ET, Monday through Friday)
Email [e-mail]
Call 1-508-759-9500
In U.S. toll free 1-800-564-4377
Fax [phone]

Technical Support (8am to 8pm ET, Monday through Friday)
Contact Product Support onsetcomp.com/support/contact
Call 1-508-759-9500
In U.S. toll free 1-877-564-4377

Onset Computer Corporation
470 MacArthur Boulevard
Bourne, MA 02532

Copyright© 2016 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOware are registered trademarks of Onset Computer Corporation. Other
products and brand names may be trademarks or registered trademarks of their respective owners. Patented technology (U.S. Patent 6,826,664) MKT1157-0229