Paramagnetic oxygen sensing is a highly accurate and reliable method for precise oxygen concentration measurement across a range of critical applications. This technology harnesses the unique magnetic properties of oxygen molecules, which are attracted to magnetic fields—a phenomenon not observed with most other gases.
Principle of Operation
Paramagnetic measurement technology utilizes the fundamental property of oxygen being diamagnetic. In the presence of a uniform magnetic field, oxygen molecules exhibit a torque due to the differential magnetic susceptibility. This principle is exploited using a sensor design, commonly known as a "dumbbell" setup, where a suspended assembly of glass bulbs filled with nitrogen gas experiences a rotational force in an oxygen-containing environment. This movement is proportional to the oxygen concentration and is detected optically and electronically.
Design and Components
- Magnetic Field: Permanent magnets create a strong, uniform magnetic field essential for the operation.
- Sensor Assembly: Typically, a lightweight dumbbell-shaped sensor is used, which rotates in response to oxygen’s magnetic influence.
- Detection Mechanism: Sophisticated optical and electronic systems are employed to measure the displacement of the sensor, translating this into a precise oxygen level reading.
Advantages
- High Accuracy and Sensitivity: This technology excels in environments where precise gas measurement is crucial, providing top-tier sensitivity and accuracy.
- Selective Measurement: Highly selective for Oxygen due to its unique paramagnetic property.
- Durability and Stability: Unlike other sensing technologies that might degrade due to material consumption or exposure, paramagnetic sensors maintain accuracy over extended periods, requiring minimal recalibration.
- Non-Consumptive Measurement: As the method does not consume oxygen, it is ideal for continuous monitoring applications, providing real-time data without altering the gas being long lasting with zero maintenance.
Applications
- Safety: Reliable accurate measurement of Oxygen deficiency for process control. Often a component in the safety control system for a process.
- Gas Quality: to ensure Oxygen concentration meets the process of high measurement integrity.
- Medical: Ensuring the correct oxygen mix in anesthesia and respiratory systems.
- Industrial: Monitoring and controlling combustion in power generation and manufacturing processes to optimize efficiency and minimize emissions.
- Environmental: Hydrogen Electrolyser Applications.
Paramagnetic sensors are indispensable in measurements that require demanding monitoring and control of oxygen levels. These include: