High-precision paramagnetic oxygen analyzer for reliable monitoring of oxygen content in industrial processes

In the industrial field, the accuracy and reliability of process control cannot be compromised. How to accurately measure the concentration of gas in the process has always been the goal pursued by manufacturers of online gas analysis instruments.

Oxygen, as one of the basic elements for sustaining life, is also a key reactant or environmental indicator in many industrial processes. Precise measurement and control of oxygen content are essential key measurement parameters for achieving safe, efficient, clean and high-quality production.

Common oxygen analysis techniques include electrochemistry, zirconia, laser, and paramagnetism, among others. Among all the available technologies, the paramagnetic oxygen analyzer stands out for its accuracy, consistency, and reliability in stable applications under various complex, harsh, and corrosive conditions. But what makes it so effective? Why is it trusted in so many industries?

The answer lies in its unique ability to measure oxygen through paramagnetism - a characteristic that most other gases do not possess.

Oxygen is naturally paramagnetic, meaning that oxygen molecules are attracted by a magnetic field due to their unpaired electrons. When oxygen encounters a magnetic field, its behavior is different from that of most other gases, which are typically non-magnetic. This property enables the paramagnetic oxygen analyzer to accurately detect and measure the concentration of oxygen with high precision.

In simple terms, the paramagnetic oxygen analyzer works by utilizing "the attractive force of the magnetic field on oxygen molecules". This attraction can be detected through various mechanical methods and converted into an electrical signal. There are several ways to achieve this:

Paramagnetic type: Inside the sensor, two glass balls filled with nitrogen gas are connected to each other and installed on a rotating suspension. When the sample gas containing oxygen flows into the analysis chamber, the oxygen molecules, due to their paramagnetic properties, will be attracted to the area with a stronger magnetic field, causing the dumbbell-shaped balls to deflect. The magnitude of the deflection is linearly related to the oxygen content. The deflection change can be detected by an optical component to accurately calculate the oxygen content.

In addition, there are magnetic pressure type and thermal magnetic type. The former uses the paramagnetic property of oxygen to generate pressure differences in the magnetic field for measurement, while the latter combines paramagnetic and thermodynamic properties for detection.

Compared to electrochemical detection methods, the paramagnetic method has the following key advantages:

• No consumables, longer service life
• Small drift, no consumables, the accuracy does not significantly decrease over time, and the calibration frequency is low
• Sensors are more corrosion-resistant
• Wide measurement range

Paramagnetic oxygen analysis instruments are typically used in industry:

• Combustion process: Insufficient or excessive oxygen content in the combustion process will affect the combustion process. Incomplete combustion leads to energy waste, while excessive oxygen content results in unnecessary gas not being heated and instead losing a lot of heat, thereby reducing thermal efficiency. Precisely controlling the oxygen content in the combustion process helps improve efficiency and energy conservation.
• Production safety: Controlling reaction rates and ensuring production process safety; for example, in chemical, pharmaceutical, and petrochemical industries, reaction vessels, centrifuges, or catalytic cracking reaction processes require strict control of oxygen content to prevent the formation of explosive mixtures.
• Atmosphere control: In the industrial field, strict control of oxygen content is required for inert gas protection and atmosphere control to prevent oxidation and ensure product quality.
• Medical field: Whether it is liquid oxygen, pure oxygen for use, or molecular sieve adsorption for oxygen production, the purity of the product oxygen needs to be tested.

The paramagnetic oxygen analyzer, with its unique detection principle and stable performance, has always been the main force in industrial process gas analysis. It shines in many fields due to its sensor technology requirements. Currently, the domestic market for paramagnetic oxygen is mainly dominated by imported ABB, Sifumei, and other foreign magnetic oxygen products.

Xi'an Runle Instrument has been engaged in the research and development of gas analyzers for nearly 20 years. As an experienced veteran in the gas analyzer industry, our paramagnetic oxygen analyzer, using imported sensors combined with rich field application experience, can provide high-quality solutions for different industrial process conditions.

Choosing Xi'an Runle Instrument's paramagnetic oxygen analyzer is not only choosing a high-quality product, but also choosing a reliable partner dedicated to solving complex gas analysis problems, providing *after-sales service, and helping to achieve safe, efficient, and clean production.