U26-001 Registrador de dados de oxigênio dissolvido HOBO

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

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)
Buoyancy
    Salt water: 13 g (0.46 oz) negative | Fresh water: 20 g (0.71 oz) negative
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
    272.4 g (9.61 oz)
Environmental Rating
    IP68

Image
CE Compliance Mark