YSI Dissolved Oxygen

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.

ROX Dissolved Oxygen Probe for long-term monitoring in fresh or sea water

YSI ODO, Optical Dissolved Oxygen, Illustration

Find a Distributor

YSI has Authorized Distributors all over the globe. View a map and find your closest contact for YSI Dissolved Oxygen products and accessories.

Get Support

Have a question about your YSI Dissolved Oxygen product? Check out the support page with resources compiled just for you.

Product Service Centers

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

Flow Dependence Tests

DO% to mg/L Calculator [Excel Spreadsheet]

Optical vs Steady State DO Comparison

Oxygen Solubility Table

Diagram of ROX Sensor Operation

Diagram of Clark Electrode Operation

		6600V2 Make the most of your environmental monitoring. The 6600 V2 sonde is the most comprehensive water quality monitoring equipment available with simultaneous measurement of conductivity (salinity), temperature, depth or level, pH/ORP.

		6600EDS Extended Deployment for Harsh Environments The 6600EDS multiparameter sonde accurately measures 10 parameters in severe fouling environments for extended periods. The sonde has two optical ports, conductivity/temperature port, Rapid Pulse DO port, and pH/ORP port. The 6600EDS also offers an extended brush that cleans the pH/ORP and Rapid Pulse DO sensors.

		6920 V2 Compact Sonde for Unattended Monitoring The YSI 6920 V2 sonde is an economical logging system, ideal for long-term in situ monitoring and profiling. Two versions: 6920 V2-1 has one optical port, conductivity/temperature port, Rapid Pulse Dissolved Oxygen port, pH/ORP port, and 3 ISE ports 6920 V2-2 has 2 optical ports, conductivity/temperature port, pH port, and one ISE port.

		6820 V2 Compact Sonde for Field Sampling The YSI 6820 V2 is a cost-effective sonde for profiling and spot-checking in rivers, lakes, wetlands, wells, estuaries, and coastal waters. Two versions are available: 6820 V2-1 has one optical port, conductivity/temperature port, Rapid Pulse DO port, pH/ORP port, and 3 ISE ports 6820 V2-2 has 2 optical ports, conductivity/temperature port, pH port, and one ISE port.

		600OMS V2 Single-Parameter, Low-Cost Optical Monitoring System Measure optical dissolved oxygen, chlorophyll, blue-green algae, rhodamine, or turbidity in combination with temperature, conductivity and depth. Designed for use in fresh, sea or polluted waters, the 600OMS V2 utilizes the field-proven YSI sensors and incorporates innovations in sensor configuration such as a conductivity and temperature module that fits into the sonde body.

		600XL V2 and 600XLM V2 Small Packages - Economical Sampling or Logging Both the YSI 600XL V2 (sampling) and the YSI 600XLM V2 (logging) offer economical solutions in small packages for surface water and ground water applications. Both models easily fit into 2-inch wells and measure a range of fundamental parameters, including oxygen - with the YSI ROX™ optical dissolved oxygen sensor - and level, using a highly-accurate vented sensor.

		600QS The Quick Solution to Handheld Sampling Combined for convenience, the YSI 650 MDS display-datalogger and the YSI 600R sonde allow you to collect 11 parameters simultaneously in real time.

		600R Water Quality Sampling Sonde The YSI 600R provides water quality sampling in a small package for surface water and ground water applications. With a diameter of less than two inches (4.2 cm), the 600R easily fits into wells.

		6500 Process Monitor Improve Operational Efficiency with Continuous Data With 8 scalable 4-20 mA current loop channels, 4 SPDT relays, and the ability to continuously monitor dissolved oxygen, conductivity, temperature, and pH via a YSI 6-Series sonde, the YSI 6500 helps you stay one step ahead in data collection.

		5200A Multiparameter Monitoring and Control Instrument Designed specifically for Aquaculture Systems, the YSI 5200 and AquaManager™ Software integrate process control, alarming, and data management into one product. Simple enough to monitor one tank, powerful enough to manage a full scale farming operation from anywhere in the world. Simultaneously measure dissolved oxygen, pH, conductivity, ORP, salinity and temperature.

		5400 MultiDO Monitoring and Control Instrument Designed specifically for Aquaculture Systems, the YSI 5400 and AquaManager® Software integrate process control, alarming, and data management into one product. Simple enough to monitor one tank, powerful enough to manage a full scale farming operation from anywhere in the world. Simultaneously measure dissolved oxygen in multiple tanks or ponds.

		Professional Plus Handheld Multiparameter Instrument The YSI Professional Plus handheld multiparameter meter provides extreme flexibility for the measurement of a variety of combinations for dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Also a very powerful lab instrument for BODs, pH and ORP.

		ProODO Handheld Optical Dissolved Oxygen Instrument The YSI ProODO^TM handheld DO meter provides extreme durability for measuring dissolved oxygen with optical, luminescent based technology for any field application or lab BODs.

		Pro20 Lab / Field Dissolved Oxygen The Pro20 provides everything you need in a handheld dissolved oxygen meter. Ruggedness, simplicity and reliability are the cornerstones of the instrument's design.

		Pro2030 Field Dissolved Oxygen / Conductivity The Pro2030 provides everything you need in a handheld dissolved oxygen meter that automatically compensates for changes in salinity values. Ruggedness, simplicity and reliability are the cornerstones of the instrument's design. Measure dissolved oxygen, salinity, conductivity, specific conductance, total dissolved solids (TDS), barometric pressure and temperature.

		5000 / 5100 Laboratory Instruments for BOD Tests Both instruments feature: auto-calibration, large, graphic displays and low keypad profiles for maximum efficiency.

		Vertical Profilers For watersheds, source water and reservoir monitoring, YSI Vertical Profiling Systems provide automated data collection and telemetry throughout a water column. These water quality profilers are available in 3 different deployment configurations, each featuring: Rugged, non-corrosive winch and drive mechanism Software for easy set-up, deployment, water quality analysis and export User-selectable sample intervals

		5906 DO Cap Membrane Kit YSI 5906 screw-on cap dissolved oxygen membranes.

		5909 DO Cap Membrane Kit YSI 5909 screw-on cap dissolved oxygen membranes.

		6150 ROX ® Optical Dissolved Oxygen Sensor (6-Series) Rugged and reliable optical dissolved oxygen sensor used with 6-Series sondes.

		6450 Anti-fouling ROX ® Optical Dissolved Oxygen Sensor (6-Series) Copper-alloy anti-fouling optical dissolved oxygen sensor used with 6-Series sondes.

		6562 Rapid Pulse Dissolved Oxygen Sensor Obtain unprecedented accuracy and reliability with the YSI 6562 Rapid Pulse™ Dissolved Oxygen Sensor.

		OBOD Optical DO Sensor Cap YSI OBOD replacement optical dissolved oxygen screw-on sensor cap for the BOD probe.

		ODO Optical DO Sensor Cap YSI ODO replacement optical dissolved oxygen screw-on sensor cap.

		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.

<< Back to Parameters page

External Resources

Manuals

Guides

FAQs - Frequently Asked Questions

Specification Sheets

Catalogs & Brochures

News Briefs

Application Notes

Technical Notes