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

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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 download, for free, 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 YSI 6600 V2 data sonde is the most comprehensive water quality monitoring equipment available with simultaneous measurement of conductivity (salinity), temperature, depth or level, pH/ORP plus...

		6920 V2 Compact Data Sonde for Unattended Monitoring The YSI 6920 V2 sonde is an economical water quality logging system, ideal for long-term in situ monitoring and profiling. Real-time turbidity monitoring, dissolved oxygen monitoring, algae monitoring, and more.

		6820 V2 Compact Sonde for Field Sampling The YSI 6820 V2 is a cost-effective data sonde for profiling and spot-checking water quality in rivers, lakes, wetlands, wells, estuaries, and coastal waters.

		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 data sonde utilizes the field-proven YSI sensors and incorporates innovations in water quality 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) data sondes 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.

		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.

		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 (D0) Meter "We are very pleased with the convenience, usability, and ruggedness of the ProODO; and highly recommend it to anyone needing to monitor dissolved oxygen." The YSI ProODO^TM handheld dissolved oxygen meter provides extreme durability for measuring DO with optical, luminescent based technology for field or lab.

		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 "YSI did a great job on this design. Our staff of about 20 people consists of old veterans to recent college grads, and not one so far has had a negative comment." The Pro2030 provides everything you need in a handheld dissolved oxygen meter that automatically compensates for changes in salinity values. Rugged, simple and reliable. Measure DO, salinity, conductivity, specific conductance, TDS, barometric pressure and temperature.

		556MPS Handheld Multiparameter Instrument Rugged, reliable and waterproof, the YSI 556 MPS (Multiprobe System) combines the versatility of an easy-to-use, easy-to-read handheld unit with all the functionality of a multiparameter system.

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

		5500D MultiDO Monitoring and Control Instrument Designed specifically for Aquaculture Systems, the YSI 5500D 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 with optcial technology in multiple tanks or ponds.

		BOD Analyst Pro™ Desktop Software Automatically calculate BOD/CBOD values with the BOD Analyst Pro desktop software.

		IQ SensorNet 2020 XT Improve Operational Efficiency with Continuous Data With an easily scalable solution, the 2020 XT allows for the connection of up to 20 sensors. This modular plug-and-play system allows you to monitor the water quality in your wastewater system continuously and accurately. "We haven't had any issues and are very happy with it. Installation and setup are very user friendly."

		IQ SensorNet 182 Models Improve Operational Efficiency with Continuous Data With an easily scalable solution the 182, 182 XT, and 182 XT-4 allow for the connection of 1-4 sensors depending on which terminal you choose. Add sensors at any time and at any location or change them out with ease. This completely modular plug-and-play system allows you to monitor the water quality in your wastewater or aquaculture system continuously and accurately.

		EcoMapper Generate high-resolution maps of water quality and bathymetry Collect high-resolution data without getting your feet wet. The EcoMapper is a unique AUV (autonomous underwater vehicle) designed specifically for mapping water quality, water currents and bathymetry.

		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

		MultiLab 4010-2 and 4010-3 Laboratory Instruments for pH, ORP, conductivity and BOD in any combination Perform accurate lab pH, ORP, conductivity or BOD measurements with the YSI 4010-2 or 4010-3 in any combination.

		2002 Pro Series Galvanic DO Sensor YSI 2002 Galvanic sensor for the Professional Plus and Pro20 DO instruments.

		2003 Pro Series Polarographic DO Sensor YSI 2003 Polarographic sensor for the Professional Plus and Pro20 DO instruments.

		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.

		5912 DO Cap Membrane Kit YSI 5912 screw-on cap dissolved oxygen membranes for galvanic sensors.

		5913 DO Cap Membrane Kit YSI 5913 screw-on cap dissolved oxygen membranes for galvanic sensors.

		5914 DO Cap Membrane Kit YSI 5914 screw-on cap dissolved oxygen membranes for galvanic sensors.

		603167 Pro Plus 4-Meter BOD/DO Lab and Field Kit US Pro Plus meter, BOD probe, 4-meter cable with Polarographic DO, Lab dock, US power supply, carrying case, cable management kit

		603169 Pro20 4-Meter Lab and Field Kit Polarographic US Pro20 meter, BOD probe, 4-meter cable with Polarographic DO, Lab dock, US power supply, carrying case, cable management kit

		603170 Pro20 4-Meter Field Kit Galvanic Pro20 meter, 4-meter cable with Galvanic DO probe, carrying case, cable management kit

		603171 Pro20 4-Meter Field Kit Polarographic Pro20 meter, 4-meter cable with Polarographic DO probe, carrying case, cable management kit

		603172 Pro20 10-Meter Field Kit Galvanic Pro20 meter, 10-meter cable with Galvanic DO probe, carrying case, cable management kit

		603173 Pro20 10-Meter Field Kit Polarographic Pro20 meter, 10-meter cable with Polarographic DO probe, carrying case, cable management kit

		603174 Pro2030 4-Meter Field Kit Polarographic Pro2030 meter, 4-meter cable with conductivity built-in and Polarographic DO probe, carrying case

		603175 Pro2030 4-Meter Field Kit Galvanic Pro2030 meter, 4-meter cable with conductivity built-in and Galvanic DO probe, carrying case, cable management kit

		603176 Pro2030 10-Meter Field Kit Polarographic Pro2030 meter, 10-meter cable with conductivity built-in and Polarographic DO probe, carrying case, cable management kit

		603177 Pro2030 10-Meter Field Kit Galvanic Pro2030 meter, 10-meter cable with conductivity built-in and Galvanic DO probe, carrying case, cable management kit

		603178 Pro Plus 4-Meter Field Kit Galvanic Pro Plus meter, 4-meter cable with Galvanic DO probe, carrying case, cable management kit

		603180 Pro Plus 4-Meter Field Kit Polarographic and Conductivity Pro Plus meter, 4-meter cable with conductivity built-in and Polarographic DO probe, carrying case, cable management kit

		603182 Pro Plus 10-Meter Field Kit Polarographic and Conductivity Pro Plus meter, 10-meter cable with conductivity built-in and Polarographic DO probe, carrying case, cable management kit

		603184 Pro Plus 4-Meter Field Kit Polarographic and pH Pro Plus meter, 4-meter cable with Polarographic DO probe, field pH probe, carrying case, cable management kit

		603186 Pro Plus 10-Meter Field Kit Polarographic and pH Pro Plus meter, 10-meter cable with Polarographic DO probe, field pH probe, carrying case, cable management kit

		603190 Pro Plus 4-Meter Field Kit Polarographic DO, Conductivity and pH Pro Plus meter, 4-meter cable with conductivity built-in and Polarographic DO probe, field pH probe, carrying case, cable management kit

		603191 Pro Plus 4-Meter Field Kit Galvanic DO, Conductivity and pH Pro Plus meter, 4-meter cable with conductivity built-in and Galvanic DO probe, field pH probe, carrying case, cable management kit

		603192 ProODO 4-Meter Field Kit ProODO meter, 4-meter cable with optical DO, carrying case

		603193 ProODO 10-Meter Field Kit ProODO meter, 10-meter cable with optical DO, carrying case

		603194 ProODO 4-Meter Lab and Field Kit US ProODO meter, ProOBOD probe, 4-meter cable with optical DO, Lab dock, US power supply, carrying case

		603199 ProODO 4-Meter Lab and Field Kit International ProODO meter, ProOBOD probe, 4-meter cable with optical DO, Lab dock, International power supply, carrying case

		603221 Pro Plus 4-Meter BOD/DO Lab and Field Kit International Pro Plus meter, BOD probe, 4-meter cable with Polarographic DO, Lab dock, International power supplies, carrying case, cable management kit

		603223 Pro Plus 4-Meter Field Kit Polarographic DO, Conductivity, and pH/ORP Pro Plus meter, 4-meter cable with conductivity built-in and Polarographic DO probe, field pH/ORP probe, carrying case, cable management kit

		603224 Pro Plus 4-Meter Field Kit Galvanic DO, Conductivity, and pH/ORP Pro Plus meter, 4-meter cable with conductivity built-in and Galvanic DO probe, field pH/ORP probe, carrying case, cable management kit

		605952 5400 Monitors DO/Temperature Cable Galvanic dissolved oxygen cable for the 5400 multi-DO aquaculture monitors.

		605953 5400 Monitors DO Cable Galvanic dissolved oxygen cable for the 5400 multi-DO aquaculture monitors.

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

		IQ SensorNet FDO® 700 Series IQ Sensors Digital FDO® optical dissolved oxygen sensors

		IQ SensorNet TriOxmatic® 700 Series IQ Sensors Digital TriOxmatic® electrochemical dissolved oxygen sensors

		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.

		YSI Optical BOD Webinar - Introducing Optical BOD Technology Archived Webinar: YSI Optical BOD Webinar - Introducing Optical BOD Technology Original Broadcast: October 21, 2010 —2:00 - 2:30 PM EDT Join us to learn about optical BOD technology. This webinar will focus on optical dissolved oxygen technology and the new ProOBOD probe from YSI. If you conduct BODs, this webinar is for you!

		Dissolved Oxygen Technologies - Part 2: Getting the Best DO Data Archived Webinar: Email Patrick Higgins to request a copy of this webinar. Original Broadcast: June 23, 2009 —2:00 - 3:00 PM EDT Getting best DO data: understanding required calibration and maintenance.

		Dissolved Oxygen Technologies - Part 1: Selecting the Right Sensor Archived Webinar: Email Patrick Higgins to request a copy of this webinar. Original Broadcast: April 16, 2009 —1:00 - 2:00 PM EDT Choosing right DO sensor: understanding optical, galvanic, polarographic technologies.

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YSI Optical BOD Webinar - Introducing Optical BOD Technology

Dissolved Oxygen Technologies - Part 2: Getting the Best DO Data

Dissolved Oxygen Technologies - Part 1: Selecting the Right Sensor