Zirconia Oxygen Analysis Technology: Principles, Applications, and Anhui Tianfen Instrument's Innovative Solutions

1  The basic principle of the zirconia oxygen analyzer

Zirconia oxygen analyzers are a new type of oxygen-measuring instrument that has emerged in recent years, with their core sensing component based on Zirconia Solid Electrolyte An oxygen concentration cell is formed. When the oxygen concentrations on the inner and outer sides of the zirconia tube differ, this occurs under high-temperature conditions (typically above 600℃ ), oxygen ions will migrate from the high-concentration side to the low-concentration side, thereby generating a[n] Oxygen Concentration Gradient Potential This potential value is consistent with Nernst Equation ： E = (RT / 4F) ln(P0 / P) , among which R 、 F They are the gas constant and the Faraday constant, respectively. T It is the absolute temperature of the zirconium tube, P0 It is the reference gas oxygen content (usually air, 20.6% O₂ ), P It is the oxygen content in the flue gas.

The zirconia oxygen analyzer primarily consists of Zirconia Probe And Oxygen Transmitter It consists of two parts. The probe is the sensing component of the oxygen analyzer, responsible for converting the oxygen content of the gas being measured into an oxygen concentration cell potential; meanwhile, the oxygen transmitter converts this concentration cell potential into 4-20mA Direct current, output to display instruments or controllers.

In practical applications, depending on the detection method, zirconia oxygen probes are primarily classified into Sampling Detection Oxygen Probe And Direct-insertion oxygen probe There are two main categories. The sampling-type oxygen probe uses a guide tube to introduce the gas being measured into the zirconia detection chamber, making it suitable for gases at lower temperatures. (0℃ ～ 650℃) Or in situations where the gas being measured is relatively clean; meanwhile, the direct-insertion oxygen probe inserts the zirconia directly into the high-temperature gas being measured. (700℃ ～ 1150℃) , featuring fast response speed, high precision, and minimal maintenance requirements.

2  The Application Scope of Zirconia Oxygen Analyzers in Industrial Production

The zirconia oxygen analyzer, renowned for its high precision and rapid response, has been widely adopted across multiple industrial sectors:

• Energy Consumption Industry : Including iron and steel metallurgy, thermal power plants, petrochemicals, paper mills, the food industry, and the textile sector, it is used to detect the oxygen content in flue gases from boilers and kilns, enabling low-oxygen combustion control and ultimately achieving energy-saving goals.
• Combustion equipment Such as waste incinerators, hazardous waste incinerators, and small-to-medium-sized heating boilers, among others.
• Process Control : Air separation units, glove boxes, semiconductor processes, heat treatment and metallurgical procedures, glass and ceramic research, inert gas purity testing, pharmaceutical studies, and more
• Special Application Environment : Welding atmosphere, gas generator, air / Fuel mixtures, etc.

Especially in high-temperature, high-dust industrial environments, zirconia oxygen analyzers have gained widespread application in combustion control due to their simple structure, high sensitivity, rapid response, and minimal interference from other components present in flue gas.

3  Industry Pain Points and Challenges

Although zirconia oxygen analyzers play a crucial role in industrial testing, they still face numerous challenges in practical applications:

3.1  Installation and Signal Transmission Issues

Traditional zirconia analyzers consist of two separate components: a detector (probe) and a converter (secondary instrument or transmitter). When in use, the detector must be installed directly onto the furnace body, while the converter is mounted inside an instrument cabinet or control room located elsewhere. The distance between the two can range from just a few meters to as much as hundreds of meters, requiring careful consideration of signal transmission over such distances. Multiple cable connections , including power supply, heating control, oxygen signal, thermocouple, temperature compensation, output signal, and more.

This separation structure has led to a series of problems: interference signals introduced by wiring at both locations prevent the instrument from operating smoothly and reliably, necessitating the use of expensive shielded cables and requiring separate routing for strong- and weak-signal lines. Additionally, it significantly increases the workload during installation, as well as the costs associated with equipment, materials, and construction. Moreover, debugging and maintenance personnel must now operate at two different locations, creating considerable inconvenience for routine operations.

3.2  Environmental Adaptability Challenges

At installation sites in specialized industries such as petroleum and chemical engineering, the separately installed transmitters also require additional explosion-proof isolation equipment, such as " Inflatable Positive-Pressure Explosion-Proof Instrument Enclosure " Wait—these types of explosion-proof devices come with both stringent requirements and high prices, significantly increasing installation costs for users.

Additionally, under certain special operating conditions—such as in the instrument measurement system of a stainless steel cold-line annealing furnace—the zirconia oxygen content analyzer may encounter Probe position has poor flue gas flowability. 、 The signal cable is directly laid above the top of the annealing furnace. Radiant heat causes issues such as damage to cable insulation.

3.3  Measurement accuracy and stability issues

In practical applications, the zirconia probe's Background potential (The potential output of the zirconia tube under non-concentration-gradient conditions) will vary with temperature changes and prolonged usage. If left unaddressed, this can significantly affect the accuracy of the entire oxygen analyzer system as well as the probe's lifespan. Meanwhile, when the gas being measured contains H2、 CO 、CH4 When flammable gases are present, these substances react with oxygen, consuming some of the oxygen and thereby reducing its concentration, which can lead to measurement errors.

4  Anhui Tianfen Instrument's Innovative Solutions

Addressing the pain points and challenges facing the industry, Anhui Tianfen Instrument Co., Ltd., leveraging its own technological expertise, has developed a series of innovative solutions:

4.1  High-performance zirconia probe design

Anhui Tianfen Instrument's zirconia probe utilizes Ion Plating Technology , significantly enhancing the electrode's antioxidant capability and extending its service life, while ensuring extremely low long-term drift in oxygen potential and delivering stable, reliable measurement data. The probe utilizes All stainless steel (1Cr18Ni9Ti) Sheath , featuring excellent wear resistance and corrosion resistance, capable of adapting to a variety of complex operating conditions.

For different application scenarios, Anhui Tianfen Instruments offers oxygen probes with various insertion depths. 600mm、800mm、1000mm、1200mm And more), while also offering customization for other specifications to meet customers' personalized needs.

4.2  Intelligent system integration

Anhui Tianfen Instrument's zirconia oxygen analyzer utilizes Liquid crystal Chinese menu display The human-machine interaction interface is user-friendly, and operation and debugging are convenient and straightforward. This design significantly reduces the learning curve and lowers the barrier to entry for users, enabling field personnel to quickly master instrument operation.

Instrument Support Online Condition Calibration , single-standard gas online calibration is convenient—process conditions can be directly calibrated for precise measurements. Meanwhile, it employs Thermal Diffusion Reference The technology eliminates the need for a dedicated reference air pump, making maintenance even simpler.

4.3  Enhanced environmental adaptability

Anhui Tianfen Instrument's zirconia oxygen analyzer features Thermal Inertia Protection This feature enables the instrument to handle frequent start-and-stop operations, ensuring continuous and accurate measurements.

For high-temperature environments, the product utilizes Direct-plug-in design , no sampling system required, fast response, effectively reducing ash buildup in flue gas, and capable of withstanding higher temperatures. Meanwhile, the analyzer boasts a compact size ( 260 x 190 x 100 mm ), the protection level reaches IP65 , capable of adapting to harsh industrial environments.

5  Anhui Tianfen Instrument's Technological Advantages

Anhui Tianfen Instrument's zirconia oxygen analyzers demonstrate significant technical advantages in multiple aspects:

• Measure performance : Measurement Range 0-25% (Programmable), instrument accuracy reaches ±1% , response time under standard gas conditions 5 Reach within seconds 90% , Temperature control accuracy ±1℃
• Stability and Reliability : The sensor employs ion-plating technology, offering excellent antioxidant resistance that extends its service life, while minimizing long-term oxygen potential drift.
• Usage Cost : Components are detachable, making component replacement convenient and facilitating maintenance while reducing operational costs.
• Adaptability : Oxygen probes come in a variety of lengths and specifications, with other sizes available for customization to meet the needs of different applications.

6  Application Cases and Achievements

Anhui Tianfen Instrument's zirconia oxygen analyzers have been successfully applied in multiple industries and scenarios, including, but not limited to:

• Energy Consumption Industry : Providing oxygen measurement solutions for companies in industries such as iron and steel metallurgy, thermal power plants, and petrochemicals, helping to achieve low-oxygen combustion control and conserve energy.
• Various combustion devices : Stably operate on equipment such as waste incinerators, hazardous waste incinerators, and small-to-medium-sized heating boilers, providing accurate oxygen content data.

Anhui Tianfen Instrument Co., Ltd. has always been committed to the research, development, production, and sales of zirconia oxygen analyzers, zirconia oxygen sensors, flue gas comprehensive analyzers, and automated control equipment, consistently delivering high-quality products and services to our customers through continuous technological innovation.

7  Conclusion

Zirconia oxygen analysis technology, as an essential tool for industrial process control and energy management, plays an indispensable role in the ever-evolving field of industrial automation. Anhui Tianfen Instrument Co., Ltd., backed by its continuous investment in technological innovation and deep understanding of market needs, has introduced effective solutions tailored to industry-specific challenges, delivering customers stable, reliable, and high-performance zirconia oxygen analyzers.

As the industrial sector increasingly demands energy conservation, emission reduction, and efficient operations, zirconia oxygen analysis technology will continue to evolve. Anhui Tianfen Instrument Co., Ltd. will remain a key player in this ongoing process, delivering more advanced detection technologies and tailored solutions to industries across the board.

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