A low-cost data logger for measuring concentrations of oxygen in lakes, streams and rivers
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.
Affordable, high performance dissolved oxygen (DO) monitoring with 0.2 mg/L accuracy
Optical DO sensor technology for long-lasting calibration with less maintenance
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: If you need to measure DO in saltwater environments, salinity or conductivity measurements are required. 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).
Sensor Type: Optical
Measurement Range: 0 to 30 mg/L; Calibrated Range: 0 to 20 mg/L; 0 to 35°C
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 Measurement: -5 to 40°C; non-Freezing
Temperature Accuracy: 0.2°C
Temperature Resolution: 0.02°C
Memory: 21,700 sets of DO and temperature measurements (64 KB total memory)
Battery: 3.6 V lithium battery; factory replaceable; Battery Life 3 years (at 5 minute logging)
Depth Rating: 100 m
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; Weight 464 g
About the manufacturer
Based on Cape Cod, Massachusetts, Onset has been designing and manufacturing its data loggers and monitoring solutions on site since the company's founding in 1981. Specialising in miniature, battery powered solutions, Onset data loggers are exceptional quality and value, ranging from indoor to outdoor and underwater applications. HOBO® data logger and weather station products are used around the world in a broad range of monitoring applications, from verifying the performance of green buildings and renewable energy systems to agricultural and coastal research.