Asair AO-03 Oxygen Sensor Module - 1-25% Vol. Linear Output

No, the AO-03 is a self-powered electrochemical sensor. It generates its own current signal (0.1±0.03 mA in air) proportional to oxygen concentration without needing an external voltage or current source for the sensing element itself. However, this current output signal will typically be read by an external amplifier or data acquisition system.

The sensor's specified data is valid for 3 months after its manufactured date under standard conditions (20°C, 50% RH, 1013 mbar). For continuous accurate measurement, it is crucial to follow the oxygen analyzer manufacturer's instructions for periodic calibration and sensor replacement, as electrochemical cells have a finite operational lifetime dependent on environmental exposure and gas concentration.

The module provides a low-level current output. To read this signal with a microcontroller (like an Arduino) or a PLC, you will need a current-to-voltage converter (a precision resistor, e.g., 100Ω) and likely an operational amplifier circuit to scale the signal to an appropriate voltage range (e.g., 0-5V) for your ADC input. Always ensure your interface circuit is properly designed for low-current measurement.

Yes, the AO-03 is designed for the 1-25% Vol. O₂ range, making it suitable for monitoring oxygen in controlled environments such as inert gas blanketing, food packaging, or laboratory glove boxes, in addition to standard air quality monitoring. Ensure the ambient temperature and pressure remain within its specified operating limits.