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Dissolved Oxygen Meters

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About Dissolved Oxygen Meters

Dissolved oxygen meters are analytical instruments used to measure the amount of oxygen dissolved in a unit volume of water. It is an important indicator of the degree of usefulness of a sample of water for a specific application.  Air consists of 21 percent oxygen and approximately 78 percent nitrogen by volume. Oxygen dissolves poorly, and can only exist in water in low concentrations. Even so, dissolved oxygen (DO) is essential for the respiration of a wide variety of animals and bacteria in the aquatic environment.  The accurate measurement of dissolved oxygen is critical to many other applications including water treatment plants, sewage treatment works, effluent activated sludge process, river monitoring, fish farming, and any other field where water quality is important. Dissolved oxygen is also one of the key measurements in biotechnical processes, and is essential to maintain quality of the finished product. 

Dissolved oxygen meters interface to one of three common types of dissolved oxygen sensing probes: polarographic sensors, galvanic sensors or optical fluorescence sensors.  Polarographic sensor technology uses an external voltage. The difference in potential between the cathode and anode is less than 0.5 volts. This includes Ross and Clark polarographic types.  A galvanic probe uses requires no external voltage. The difference in potential between the cathode and anode is greater than 0.5 volts. Galvanic probes are more stable and more accurate at low dissolved oxygen levels than polarographic probes. Galvanic probes often operate several months without electrolyte or membrane replacement, resulting in lower maintenance cost.  The optical fluorescence sensor does not use up oxygen during measurement, therefore it does not require stirring.  The device is extremely suitable for long-term measuring periods in groundwater. It is not sensitive to contaminants, sulfurous compounds, or aging.  The sensor has a special coating with fluorescent properties. When light is exposed to the coating it causes fluorescence.  After the exposure of light, the coating continues to produce a short afterglow. The level of oxygen present in the water determines the duration of this fluorescence or afterglow.

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Products & Services Related to Dissolved Oxygen Meters

Conductivity and Resistivity Meters
Conductivity meters, dissolved solids meters, and resistivity meters are analytical instruments that measure the conductivity, dissolved solids, and/or resistivity of a liquid sample.
Dissolved CO2 Instruments
Dissolved CO2 instruments are analytical devices that measure the amount of carbon dioxide (CO2) dissolved in a liquid sample such as water. They typically include a submerged probe that is covered by a thin organic membrane.
Ion Specific Electrode Meters
Ion specific electrode meters are millivolt meters that interface with ion selective electrodes (ISEs). These meters take the potential generated by the electrode and convert it into units of concentration.
Oil In Water Monitors
Oil in water monitors are used to detect the presence of hydrocarbons in water.
pH and Oxidation Reduction Potential (ORP) Instruments
pH and oxidation reduction potential (ORP) instruments measure or monitor pH (relative concentration of hydrogen ions [H+] in a solution) as well as ORP.
Turbidity Instruments
Turbidity instruments measure the average volume of light scattering over a defined angular range. Both particle size and concentration of suspended solids as well as dissolved solids can affect the reading.
Water Quality Testing Instruments
Water quality testing instruments are used to test water for chemical and biological agents, and to measure variables such as clarity and rate of movement.

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Engineering Web: Dissolved Oxygen Meters

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Benchtop Dissolved Oxygen Meters, YSI Biological Oxygen...
- Choose from our comprehensive line of Benchtop Dissolved Oxygen Meters and other Dissolved Oxygen Meters products.
Cole-Parmer Dissolved Oxygen Meters, Cole-Parmer Portable DO...
Cole-Parmer Catalog > Oxygen > Handheld and Portable Dissolved Oxygen Meters > Cole-Parmer Dissolved Oxygen Meters
Dissolved Oxygen Meters
Dissolved Oxygen Meters Popular Dissolved Oxygen Meters Sections: Dissolved Oxygen Meters Compact and Portable DO Meters.
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Part Numbers for Dissolved Oxygen Meters

Part # Distributor Manufacturer Product Category Description
13620SSP Amazon Fisher Scientific BISS Fisher Scientific BOD Probe for accumet Benchtop Dissolved Oxygen Meters
1329978 Amazon Yellow Springs Instrument BISS YSI Probe Adapter Cable for Models 5000 and 5100 Dissolved Oxygen Meters; Adapter
13637DOM Amazon Thermo Scientific Orion BISS Fisher Dissolved Oxygen Membrane Kit for accumet Benchtop Dissolved Oxygen Meters; 6 Per Kit
1329976 Amazon Yellow Springs Instrument BISS YSI Model 5905 Self-Stirring BOD Probe for Dissolved Oxygen Meters;For YSI Model 5905
4KC32 Grainger Industrial Supply EXTECH INSTRUMENTS CORP Water Testing Meters Meter,Dissolved Oxygen

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