U26-001
HOBO Dissolved Oxygen Data Logger
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.
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
-
Optical
-
0 to 30 mg/L
-
0 to 20 mg/L; 0 to 35°C (32 to 95°F)
-
± 0.2 mg/L up to 8 mg/L; ± 0.5 mg/L from 8 to 20 mg/L
-
0.02 mg/L
-
To 90% in less than 2 minutes
-
6 months, cap expires 7 months after initialization
Temperature
-
-5 to 40°C (23 to 104°F); non-Freezing
-
0.2°C (0.36°F)
-
0.02°C (0.04°F)
-
To 90% in less than 30 minutes
Logger
-
21,700 sets of DO and temperature measurements (64 KB total memory)
-
1 minute to 18 hours
-
±1 minute per month at 0 to 50°C (32 to 122°F)
-
3.6 V lithium battery; factory replaceable
-
3 years (at 5 minute logging)
-
Optical
-
100 m (328 ft)
-
Salt water: 13 g (0.46 oz) negative | Fresh water: 20 g (0.71 oz) negative
-
Black Delrin®, PVC, EPDM o-rings, silicone bronze screws; rated for saltwater use
-
39.6 mm diameter x 266.7 mm length (1.56 x 10.5 inches)
-
272.4 g (9.61 oz)
-
IP68
Compatible items
Antifouling Protective Guard
Data Offload - Base Stations - Shuttles - Couplers
Stainless Steel Cable/Crimps
Well Caps
Compliance Certificates
Calibration Solution
Coupler
Replacement Parts
Data Offload - Base Stations - Shuttles - Couplers
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
HOBO Waterproof Shuttle
HOBO Salt Water Conductivity/Salinity Data Logger
Antifouling Protective Guard
