High precision zirconia oxygen analyzer probe

Anhui Tiancai Instrument Co., Ltd. is a manufacturer of zirconia oxygen analyzer. With high-quality products, a research and development team, and scientific and rigorous production technology, we provide high-quality services and customized specifications of zirconia analyzer for companies that need to measure and grasp the oxygen content in flue gas during combustion in real time. Our products are involved in many industries such as petrochemicals, pharmaceuticals, steel, research institutes, coal mines, textiles, etc. Over the years, with a good reputation and excellent product quality, it has benefited hundreds of enterprises by providing zirconia analyzers for combustion monitoring and control processes, and successfully helped these enterprises achieve considerable energy-saving and environmental pollution reduction benefits.

High precision zirconia oxygen analyzer probe

Construction of zirconia analyzer probe:

Zirconia (ZrO2) is a ceramic, a solid with ion conductive properties. At room temperature, it is a monoclinic crystal. When the temperature rises to 1150 ℃, the crystal form transforms into a cubic crystal, with a volume shrinkage of about 7%; When the temperature decreases, it becomes a monoclinic crystal again. If heated and cooled repeatedly, ZrO2 will break. Therefore, pure ZrO2 cannot be used as a measuring element. If a certain amount of calcium oxide (CaO) or yttrium oxide (Y2O3) is added as a stabilizer in ZrO2, and then high-temperature calcination is carried out, it becomes a stable zirconia material. At this time, tetravalent zirconium is replaced by divalent calcium or trivalent yttrium, and oxygen ion holes are generated, so ZrO2 belongs to anionic solid electrolytes. ZrO2 mainly conducts electricity through the movement of holes, and when the temperature reaches above 600 ℃, ZrO2 becomes a good oxygen ion conductor. Sintering a platinum electrode on each side of the zirconia electrolyte, when the oxygen partial pressure on both sides of the zirconia is different, the oxygen on the side with higher oxygen partial pressure migrates in the form of ions to the side with lower oxygen partial pressure. As a result, the platinum electrode on the side with higher oxygen partial pressure loses its electron positive charge, while the platinum electrode on the side with lower oxygen partial pressure gains electron negative charge, thus generating an oxygen concentration potential between the two platinum electrodes. This potential is only related to the difference in oxygen content (oxygen concentration difference) between the gases on both sides at a constant temperature. If the oxygen content on one side is known (such as the oxygen content in the air being constant), the oxygen content on the other side (such as the oxygen content in smoke) can be represented by the oxygen concentration potential. By measuring the oxygen concentration potential, the oxygen content in the smoke can be determined.

High precision zirconia oxygen analyzer probeIt has the advantages of simple structure and sampling preprocessing system, high sensitivity and resolution, wide measurement range, and fast response speed.

The detector consists of main components such as dust prevention device, zirconia tube, heating furnace, thermocouple, gas conduit, junction box, and housing. The entire device adopts a fully enclosed structure to increase its sealing performance and improve its service life. For high dust detection environments, porous ceramic filters were installed to achieve better filtration efficiency.

The zirconia tube inside the detector is the core component and is a fragile ceramic item. During transportation, installation, and use, severe vibration should be avoided to prevent damage. The function of the heating furnace inside the detector is to provide the temperature required for the normal operation of the zirconia element. In order to extend the service life of the heating furnace, special treatment has been made in the process. Due to the heating device of the detector itself, it can work normally in environments below 700 ℃.