Description
The percentage-level (%) paramagnetic oxygen analyzer exploits the unique and exceptionally strong paramagnetic properties of oxygen molecules to determine O2 concentrations via physical force measurement (magnetic dynamic deflection). Since it relies on a non-depleting physical principle, it offers high selectivity, rapid response, outstanding linearity, and immunity to combustible background gases without consuming the sample gas. This analyzer is widely deployed in industrial Air Separation Units (ASUs) for pure and enriched oxygen certification, petrochemical reactor safety loops (e.g., VCM, EO/EG, Maleic Anhydride), flare gas monitoring, and blast furnace oxygen enrichment, serving as a cornerstone instrument for safety and quality control.
Principle
Paramagnetic oxygen analyzers utilize the unique paramagnetic property of oxygen for measurement: when a nitrogen-filled quartz dumbbell deflects under the influence of a magnetic field, the analyzer measures the feedback current required to restore equilibrium—a current that is directly proportional to the oxygen concentration.
Application
• Air Separation Units (ASUs) & Industrial Gas Fillings
High-Purity Oxygen Product Certification: Measuring oxygen purity within the 95% to 99.9% range at cold boxes to certify medical and industrial-grade oxygen before bottling.
Air Intake and Enrichment Monitoring: Real-time percentage monitoring of enriched oxygen (21% to 50%) supplied to blast furnaces or gasification units.
• Petrochemical & Chemical Process Safety (Explosion Prevention)
Ethylene Oxide / Ethylene Glycol (EO/EG) Reactors: Continuous monitoring of feed oxygen percentages (typically 5% to 10%) in chemical loops to prevent the reaction gas mixture from crossing the Upper Explosive Limit (UEL).
Vinyl Chloride Monomer (VCM) Production: Tracking oxygen content in chlorine-rich environments to prevent runaway catalytic chlorination and secure pipeline integrity.
Maleic Anhydride (MA) Reactor Feed: Precisely balancing the butane-to-oxygen ratio to maximize oxidation yield while keeping the process gas non-combustible.
• Refinery & Flare Gas Monitoring
Flare Stack Header Gas Safety: Detecting unexpected oxygen ingress (0% to 5% range) in hydrocarbon flare headers to prevent catastrophic pipeline explosions during gas venting.
Vapor Recovery Systems (VRUs): In-line tracking of %-level O_2 in recovered organic solvent vapors to ensure safe transport and condensation.
• Metallurgy & Combustion Air Enrichment
Blast Furnace Oxygen-Coal Injection: Monitoring oxygen percentages injected into hot-blast stoves to optimize pulverized coal combustion efficiency and molten iron yields.
Basic Oxygen Steelmaking (BOF) Exhaust: Tracking post-combustion exhaust oxygen percentages during steel decarburization processes.
• Medical Gas Verification & Physiology
Medical Pipeline Verification: Used in hospitals and medical gas blending systems to ensure continuous oxygen purity (93% or 99%) flowing to operating theaters and wards.
Metabolic and Respiratory Study Exhaled Gas: Precise tracking of inhaled (20.95%) and exhaled oxygen changes in high-end physiological laboratories without sensor aging.
Measurement components and ranges
• O2: 0 ~ 100%
For detailed introduction, please refer to Paramagnetic Oxygen Analyzer.