Asair AO-02 Oxygen Sensor - Electrochemical Partial Pressure Sensor

The AO-02 produces a linear millivolt (mV) output, typically 9-13 mV when exposed to standard ambient air (20.9% O2). To read it, connect the sensor's output wires directly to the analog input of a microcontroller (like an Arduino), PLC, or data logger with a high-impedance input. No external power supply is needed for the sensor itself, but your measurement device must be capable of reading low-voltage DC signals.

Yes, for precise measurements, the sensor should be calibrated. Its full measurement range is 0 to 100% oxygen by volume. Calibration typically involves taking a reading in a known reference gas (like 20.9% O2 in clean, dry air) and adjusting your system's scaling factor accordingly. The built-in temperature compensation helps maintain accuracy, but periodic calibration checks are recommended for critical applications.

The AO-02 is commonly used in applications requiring oxygen concentration monitoring. Primary uses include vehicle and engine exhaust gas analysis for emissions testing, environmental monitoring of ambient air in enclosed spaces, and industrial safety systems for detecting oxygen deficiency in confined areas. It is also suitable for educational projects and research involving gas detection.