Polarographic Dissolved Oxygen Sensors

Polarographic dissolved oxygen sensors utilize an oxygen permeable membrane that enables a chemical reduction reaction which produces an electrical signal to capture the DO concentration value by compensating for the changing solubility of oxygen with temperature. These electrochemical DO sensors offer highly accurate measurements at the lowest oxygen levels (down to 0.1 ppb) in pharmaceutical, food and beverage, chemical, microelectronics, pure water and waste water applications. Easy maintenance is ensured with a long-lasting membrane to reduce costs and support production in your process. Polarographic DO probes also have Intelligent Sensor Management (ISM) predictive diagnostics available to provide all of the necessary information for deciding if the sensor is good for the next batch.

METTLER TOLEDO offers a range of polarographic dissolved oxygen sensors fully suitable for various industrial applications. The InPro 6800/6850i provide maximum accuracy for vessels with limited space or in containers with smaller volumes. These electrochemical DO sensors are available with 12 or 25 mm diameter bodies in durable 316L stainless steel and with PTFE/silicone membranes. The InPro 6900(i)/6950i offer the same advanced features as the InPro 6800, with the additional benefit of being able to measure trace oxygen concentrations. In particular, the InPro 6950i sensor offers excellent accuracy at the lowest oxygen levels due to the built-in 4-electrode measurement system. For pure water monitoring, the High Performance DO Probe from METTLER TOLEDO Thornton is a polarographic DO probe that is available in analog or ISM technology and meets the fast response time and accuracy levels needed for microelectronics UPW, power and pharmaceutical water systems.

Polarographic dissolved oxygen sensors are membrane based and use an electrochemical 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. Optical DO sensors utilize fluorescence quenching technology, which is the result of an energy transfer between a fluorescing chromophore and oxygen molecules.

With Intelligent Sensor Management (ISM) technology, installation, handling and maintenance of the polarographic DO sensor system improves significantly. The real-time electrochemical DO sensor diagnostics provide all of the necessary information for deciding if the sensor is good for the next batch. Predictive maintenance tools for pre-batch diagnostics support production planning and help avoid outages during production. With these features, efficient and safe operation of the polarographic DO probe is assured. Plug and Measure ISM technology allows you to calibrate the polarographic DO sensor away from the process and then quickly integrate it where needed. This ensures fast sensor start-up and commissioning of a measurement point.