Part Number - U26-001

HOBO Dissolved Oxygen Data Logger

$1,350.00 USD
An affordable, precise data logger that measures oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waters.

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.

Country of Origin
United States

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

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Description: ce

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

Compatible items

Antifouling Protective Guard

U26-GUARD-2
$105.00 USD

Carrying Case

CASE-PELICAN-1510
$265.00 USD

Data Offload - Base Stations - Shuttles - Couplers

U-DTW-1
$280.00 USD

Stainless Steel Cable/Crimps

CABLE-1-300
$455.00 USD
CABLE-1-50
$95.00 USD
CABLE-1-CRIMP
$38.00 USD

Well Caps

WELL-CAP-01
$53.00 USD

Compliance Certificates

COMPLIANCE_CERT
$25.00 USD

Calibration Solution

U26-CAL-SOL
$32.00 USD

Coupler

Replacement Parts

U26-RDOB-1
$125.00 USD

Data Offload - Base Stations - Shuttles - Couplers

BASE-U-4
$140.00 USD
U-DTW-1
$280.00 USD

Graphing & Analysis

BHW-PRO-DLD
$75.00 USD
BHW-PRO-CD
$99.00 USD
BHW-PRO-USB
$99.00 USD

What's in the box

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

Documents

HOBO Dissolved Oxygen Logger (U26-001) User's Manual

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HOBOware Pro Dissolved Oxygen Assistant - User’s Guide

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Reviews

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