1. Key Technical Specifications Detecting gas: Air, medical high-purity oxygen Measuring range: Two options, 0.1%–25% O₂ / 1%–96% O₂ Core material: Yttria-stabilized zirconia ceramic chip Working ambient temperature: -20℃ ~ +70℃, built-in temperature compensation Detection accuracy: ±0.25%FS (0.1–25% range); ±1.0%FS (1–96% range) Warm-up time: ≤30 seconds Heater voltage: 3.6–4.4VDC, heating power 2–3W Output signal: Stable limiting current signal (μA level) Cross interference: Low sensitivity to water vapor, CO₂ and trace organic gas Service life: More than 20,000 continuous working hours Packaging: Mini metal TO-8/TO-39 shell, compact size 2. Core Function Continuously monitor real-time oxygen concentration output by oxygen concentrators, feed concentration data to main control PCB. Trigger low/high oxygen concentration alarm to remind abnormal gas output and ensure safe oxygen inhalation for patients. Support long-time uninterrupted operation of medical ventilators, anesthesia machines and infant incubators for stable oxygen monitoring. Solid ceramic structure avoids electrolyte leakage, no frequent replacement required, only simple regular calibration. Supports equipment self-check function; feeds abnormal chip signal back to ECU to activate device fault reminder. 3. Working Principle This sensor relies on zirconia ion conduction and diffusion limiting current theory: Built-in platinum heater heats zirconia ceramic to 600–700°C to form oxygen ion conductive medium. Oxygen molecules pass through tiny diffusion limiting holes to the cathode electrode, limited by fixed diffusion rate. Fixed driving voltage pushes oxygen ions to migrate from cathode to anode through zirconia electrolyte to form pumping current. When oxygen diffusion reaches saturation, the current stays at a stable limiting value, which changes linearly with oxygen volume fraction. Peripheral circuit collects the limiting current value and converts it into standard oxygen concentration data for equipment display and judgment. 4. Application Scope Equipment Types Home oxygen generators for the elderly and respiratory patients, portable medical oxygen analyzers, clinical ventilators, anesthesia equipment, infant incubators, hyperbaric oxygen cabins, indoor air quality monitors Matching Control Parts Oxygen concentrator main control boards, respiratory monitoring modules, medical gas pipeline detection equipment Application Scenarios Household long-term oxygen therapy, hospital clinical respiratory monitoring, oxygen purity inspection of medical gas pipelines, indoor air oxygen content detection