Optical Dissolved Oxygen Sensors
Highly Accurate Measurements with In-Line Optical DO Probes
Optical dissolved oxygen sensors combine precise measurement with low maintenance to continuously monitor the dissolved oxygen level in process and water applications. These optical DO probes offer strong signal stability and quick response times with low maintenance requirements. These oDO sensors take advantage of Intelligent Sensor Management (ISM) technology to provide predictive diagnostics and fulfill requirements in diverse hygienic applications.
Accurate Measurement Results through Optical DO Technology
Measurement accuracy is achieved through fluorescence quenching technology to ensure the optical DO sensor is always ready for measurement, allowing you to focus on the process itself.
Strong Signal Stability with Quick Response Times
Optical dissolved oxygen probes provide strong measurement performance with low detection limits, minimum drift and short response times to improve oxygen monitoring and reduce out of spec production.
Sterilizable and Autoclavable for Hygienic Conditions
Select optical DO probes are fully steam sterilizable, autoclavable and fulfill requirements for hygienic design and traceability in pharmaceutical and beverage applications.
Efficient Maintenance with Electrolyte-Free Design
Since no electrolyte exchange or sensor polarization is needed when measuring with optical dissolved oxygen probes, sensor maintenance is less error-prone and faster.
Optimal for a Wide Range of Applications
METTLER TOLEDO's optical dissolved oxygen sensors can be used for a wide range of applications including pure water monitoring, bioreactor process control and beer filling-line optimization.
Uncompromised Quality with No Signal Noise
The OptoCap sensing element on METTLER TOLEDO oDO sensors is easy to replace and helps eliminate signal noise for more stable and reliable oxygen measurements.
Optical DO Sensors Feature ISM Predictive Diagnostics
ISM technology simplifies installation and maintenance of your optical dissolved oxygen sensor and provides predictive diagnostics to improve calibration planning.
Useful Related Links
Good Operating Procedures (GoP) for Optical Dissolved Oxygen Sensors
In this Good Operating Procedures (GoP) Guide from Mettler-Toledo Process Analytics you will find a wealth of information to get the most out of your dissolved oxygen sensors. You will find detailed information about the operating principles of optical dissolved oxygen sensors along with field-tested best practice recommendations for applying this sensing technology in your applications. Read more
Five Reasons to Switch to Optical DO Measurement
Download "Switch to Optical DO Sensors: An Easier Way to Measure" and read more about the benefits of METTLER TOLEDO's optical sensors. Read more
Case Study: Minimize DO Sensor Maintenance
This case study explores how EDP Group, which operates one of Brazil's largest power plants, needed to minimize DO sensor maintenance within the plant. Switching from polarographic dissolved oxygen sensors to optical sensors equipped with ISM predictive diagnostics enabled a massive drop in DO probe maintenance. Read more
Process Analytics Product Catalog
The Process Analytics Catalog provides a comprehensive overview of solutions for analytical measurements in liquid process applications, pure water monitoring and gas-phase measurement. Parameters covered include pH, dissolved oxygen, dissolved CO2, conductivity, turbidity, and total organic carbon. Read more
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FAQs
What is an optical dissolved oxygen sensor?
A METTLER TOLEDO optical dissolved oxygen sensor combines precise measurements with low maintenance to continuously monitor the dissolved oxygen level in water or another liquid. The heart of the optical DO sensor is an oxygen-sensitive layer containing immobilized marker molecules. They absorb light from a light emitting diode and are able to release this energy as light at a different wavelength (fluorescence). This effect allows determination of the oxygen concentration in the sample media. These optical dissolved oxygen probes offer highly accurate oxygen measurements with enhanced signal stability and fast response times. The sensors are fully steam sterilizable, autoclavable and fulfill requirements for hygienic design and traceability. Since no electrolyte exchange or sensor polarization is needed, sensor maintenance is easy and less error-prone. This optical dissolved oxygen probe also takes advantage of ISM technology.
Which METTLER TOLEDO optical DO sensors are available?
METTLER TOLEDO offers a range of optical dissolved oxygen sensors fully suitable for diverse hygienic applications. The InPro 6860i optical DO probe offers highly accurate oxygen measurement with enhanced stability, and easy handling without electrolyte change or time-consuming polarization procedures in biopharma applications. The InPro 6960i/6970i optical DO probes provide outstanding measurement performance with a low detection limit, minimum drift and short response time to improve oxygen monitoring and reduce out of spec production. Optical oxygen technology in 12 mm design like the InPro 6960i/6970i is available for challenging brewery applications such as filler line measurement. For pure water monitoring, the Pure Water Optical DO Probe from METTLER TOLEDO Thornton offers fast response and increased stability in demanding low-ppb applications such as monitoring DO in microelectronics ultrapure water systems or power plant water.
What is the difference between an optical DO sensor and a polarographic DO sensor?
METTLER TOLEDO offers two in-line dissolved oxygen sensors that utilize different technologies to determine dissolved oxygen levels in water or other liquids. Optical DO sensors utilize fluorescence quenching technology, which is the result of an energy transfer between a fluorescing chromophore and oxygen molecules. Polarographic dissolved oxygen sensors are membrane based and use polarographic technology. Oxygen diffuses through the membrane and is reduced at a cathode that is held at a defined potential. The measured reduction current is proportional to the partial pressure of oxygen in the media. Both optical DO sensors and polarographic DO sensors have a hygienic design and are available with Intelligent Sensor Management (ISM) predictive diagnostics.
What are the available ISM features with optical dissolved oxygen probes?
With Intelligent Sensor Management (ISM), the installation, maintenance and safety of the optical DO sensor system improves significantly. All relevant data is stored in the sensor, and real-time diagnostics provide all necessary information for deciding if a sensor is good for the next batch. Plug and Measure technology in the optical dissolved oxygen sensor leads to faster start up, no configuration at the transmitter and the risk of handling errors is eliminated. The need for maintenance in the optical oxygen measuring system is monitored via the Dynamic Lifetime Indicator. With these features, error-free and safe operation of the optical dissolved oxygen probe is assured.