
Dissolved Oxygen
"We have used YSI products for many years. We still use DO meters purchased in 1975."
Every species on our planet depends on water and oxygen. For aquatic species, adequate dissolved oxygen is of prime importance to their continued survival. Since dissolved oxygen levels are directly related to good water quality, the two are highly interdependent. Many factors can affect DO levels, and an understanding of these levels in order to make informed decisions concerning wastewater treatment operations, hypoxic zones, aquaculture facilities or large-scale ecosystems is essential.
YSI has Authorized Distributors all over the globe. View a map and find your closest contact for YSI Dissolved Oxygen products and accessories.
Have a question about your YSI Dissolved Oxygen product? Check out the support page with resources compiled just for you.
Want to return a product for service? Here you’ll find authorized service centers and instructions on how to send in your YSI Dissolved Oxygen product.
As the pioneers in DO, YSI commercialized the first practical dissolved oxygen sensor using the Clark Polarographic electrode in 1962 based on the work of Dr. Leland Clark in conjunction with YSI scientists. This technology became, and still is, the trusted global standard for dissolved oxygen measurement. In 1992, YSI released the patented Rapid Pulse® stirring-independent oxygen sensor which revolutionized the measurement of dissolved oxygen in long-term monitoring applications.
In 2005, YSI released its first optical dissolved oxygen sensor that utilized luminescent technology. The wiped ROX® probe significantly increased customer value by reducing costs associated with maintenance, especially when used in long-term monitoring applications.
The ultimate in handheld optical dissolved oxygen measurement can be found on the ProODO®. The ODO® (Optical Dissolved Oxygen) luminescent sensor has no flow dependence making it the perfect choice for applications like deep water profiling where stirring is difficult or undesirable. No flow dependence also reduces the possibility of operator error due to inadequate stirring, ensuring high quality data. However, stirring, or movement, of the optical DO sensors does improve response time. YSI may be the only ones who will tell you that.
When it comes to dissolved oxygen measurement, YSI offers more knowledge, more experience and more technology options than any other company. We hope you find this resource page helpful and informative. Visit it frequently. After all, “We Know DO™".
We invite you to log in and download the very popular The Dissolved Oxygen Handbook. This resource on dissolved oxygen measurement, dissolved oxygen sensors, and dissolved oxygen data has been a huge hit and you can receive it free. Please see the link to the left hand side of the page.
YSI Rapid Pulse vs ROX Sensors - Cost Comparison
DO% to mg/L Calculator [Excel Spreadsheet]
Optical vs Steady State DO Comparison
Diagram of ROX Sensor Operation
Diagram of Clark Electrode Operation
US EPA: Monitoring and Assessing Water Quality
Locate Your Regional EPA Office
North Central Labs Book on Laboratory Testing for BOD and CBOD
State DMR-QA Coordinators Contact Information - Contact for Questions on Optical DO Acceptance
The Effects of Dissolved Oxygen on Fish (Chart)
Dissolved Oxygen Concentrations in Pond Aquaculture
IQ SensorNet TriOxmatic 702 Sensor User Manual
IQ SensorNet TriOxmatic 701 Sensor User Manual
IQ SensorNet FDO Sensor User Manual
IQ SensorNet TriOxmatic 700 Sensor User Manual
6-Series Sonde Quick Start Guide
YSI Dissolved Oxygen Membrane Selection Guide
Handheld Dissolved Oxygen Model Comparison Guide
Handheld Dissolved Oxygen Response Time Comparison Guide
Handheld Response Times and Membrane Guides
Model Pro20 vs 55 Comparison Guide
Feed Smart Feed Timer Overview
YSI 5000 / 5100 DO Instrument FAQs
Dissolved Oxygen Measurement FAQs
6-Series Sonde Calibration, Maintenance & Troubleshooting Tips
Professional Plus Handheld Calibration Tips
YSI 5000 / 5100 DO Instrument FAQs
Dissolved Oxygen Measurement FAQs
YSI Pro2030 Dissolved Oxygen/Conductivity Meter Specification Sheet
YSI 5400 Continuous MultiDO Monitor Specifications
YSI 5200A Continuous System Monitor Specifications
YSI ProODO Optical Dissolved Oxygen Meter Specification Sheet
YSI Pro20 Dissolved Oxygen Meter Specification Sheet
YSI Professional Plus Water Quality Instrument Specifications
Français - YSI Professional Plus qualité de l'eau Spécifications de l'instrument
Español - YSI Professional Plus de Calidad del Agua de instrumentos Especificaciones
YSI BOD Analyst Pro™ Desktop Software
IQ SensorNet FDO Optical DO Sensor Specification Sheet
YSI IQ SensorNet 182, 182 XT, 182 XT-4 Specifications Sheet
YSI IQ SensorNet 2020 XT Specifications Sheet
YSI ROX Optical Dissolved Oxygen Sensor
IQ SensorNet Wastewater Process Monitoring & Control Catalog
Aquaculture Monitoring & Control
YSI Vertical Profiling Systems
Dissolved Oxygen Case Studies & Solutions
U.S. EPA Status on Approval of Luminescent/Optical Dissolved Oxygen Method
IQ SensorNet Continuous Process Monitoring of Ammonia and DO at WWTP
Network Monitors Water Quality in Shale Gas Drilling Region
Water Quality Is Key to the Success of Cardiff Bay Restoration
Lake Tanganyika Productivity and Nutrient Uptake Research with the ProODO
Using Real-time Telemetry for Ecological Monitoring of Coastal Wetlands
Students Monitor Harlem River Water Quality and Air Quality, Seek Solutions
ECSI Manages Habitat in High Hydrogen Sulfide Environments with Optical DO
Desalination Plants: YSI Instruments Monitor Flow & Water Quality at Multiple Stages
Vertical Profiling Safeguards Drinking Water and Sheds Light on Cyanobacteria
Dissolved Oxygen Management and Related Costs in Pond Aquaculture
Español - Gestión del Oxígeno Disuelto y costes relacionados en estanques de piscicultura
Managing and Protecting Remote Source Water for the East Bay Area
Public-Private Contract Safeguards Malaysia’s Water Quality
Pontoon-Mounted Autonomous Monitoring System Keeps Constant Watch on Harmful Algal Blooms
Unattended Water Quality Monitoring Protects Domestic Water Supply at Taiwan’s Shimen Reservoir
J. Lohr Winery Utilizes YSI Instruments in Managing Dissolved Oxygen
YSI DO200 Assists Roland Martin in Determining Fishing Locations
Restoration Procedure for YSI Membrane Covered Dissolved Oxygen Probes Exposed to H2S or SO2
How to Ensure Accurate and Successful BOD Measurements
YSI 6562 Rapid Pulse™ Dissolved Oxygen Probe Membrane Maintenance
Environmental Dissolved Oxygen Values Above 100% Air Saturation
Care, Maintenance, and Storage of YSI 6-Series Probes and Sondes
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YSI 5906 screw-on cap dissolved oxygen membranes. |
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YSI 5909 screw-on cap dissolved oxygen membranes. |
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YSI 5912 screw-on cap dissolved oxygen membranes for galvanic sensors. |
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YSI 5914 screw-on cap dissolved oxygen membranes for galvanic sensors. |
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YSI 5913 screw-on cap dissolved oxygen membranes for galvanic sensors. |
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605952 5400 Monitors DO/Temperature Cable Galvanic dissolved oxygen cable for the 5400 multi-DO aquaculture monitors. |
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Galvanic dissolved oxygen cable for the 5400 multi-DO aquaculture monitors. |
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6150 ROX ® Optical Dissolved Oxygen Sensor (6-Series) Rugged and reliable optical dissolved oxygen sensor used with 6-Series water quality sondes. |
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6450 Anti-fouling ROX ® Optical Dissolved Oxygen Sensor (6-Series) Copper-alloy anti-fouling optical dissolved oxygen sensor used with 6-Series sondes. |
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6562 Rapid Pulse Dissolved Oxygen Sensor Obtain unprecedented accuracy and reliability with the YSI 6562 Rapid Pulse™ Dissolved Oxygen Sensor. |
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IQ SensorNet FDO® 700 Series IQ Sensors Digital FDO® optical dissolved oxygen sensors |
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IQ SensorNet TriOxmatic® 700 Series IQ Sensors Digital TriOxmatic® electrochemical dissolved oxygen sensors |
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YSI OBOD replacement optical dissolved oxygen screw-on sensor cap for the BOD probe. |
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YSI ODO replacement optical dissolved oxygen screw-on sensor cap. |
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ProOBOD Self-Stirring Optical BOD Probe The ProOBOD® self-stirring optical BOD probes are designed to fit into standard 300 mL BOD bottles with an international version also available for use with other tapers. |
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