Description
Reviews
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Brand | ASAIR |
| Model Number | AO-03 |
| Sensor Type | Electrochemical Oxygen Cell |
| Measurement Range | 0-25% O2 Volume |
| Output Signal | UART / 4-20mA |
| Power Supply | 12-24V DC |
| Operating Temperature | -20°C to 50°C |
| Response Time | Less than 30 Seconds |
| Cell Lifespan | Approx. 2 Years in Air |
| Certification | CE / RoHS Compliant |
Anonymous
Apr 06, 2026
Rating: 4/5
Stable performance
Using this for greenhouse oxygen level monitoring. It handles the humidity well. Would recommend for agricultural tech applications.
Anonymous
Mar 19, 2026
Rating: 5/5
Accurate readings
Compared this against a standard gas reference and it was spot on. Great for environmental monitoring projects where precision matters.
Anonymous
Feb 21, 2026
Rating: 5/5
Reliable for industrial ventilation
We installed these modules in our HVAC control system. The readings are stable and match our handheld calibrators. Very satisfied with the performance.
Anonymous
Feb 01, 2026
Rating: 5/5
Easy to install
The wiring diagram was clear. Mounted it in a control cabinet and it has been running without errors for three months now.
Anonymous
Jan 18, 2026
Rating: 4/5
Good value for money
Works as described. Integration was straightforward using the UART interface. Only minor issue was the documentation could be more detailed.
Q: What is the maximum cable length for the output signal?
A: For 4-20mA output, up to 500 meters is supported depending on wire gauge. For UART, we recommend keeping it under 5 meters.
Q: Can I replace the oxygen cell myself?
A: Yes, the 4OXV oxygen cell is replaceable. Please follow the replacement guide in the user manual to avoid damaging the contacts.
Q: Is there a warranty included?
A: Yes, this module comes with a standard 12-month manufacturer warranty covering defects in materials and workmanship.
Q: Is this sensor suitable for medical ventilators?
A: No, this product is designed for industrial and environmental monitoring only. It is not certified for medical life-support applications.
Q: Does the module require specific calibration gas?
A: Fresh air (20.9% O2) is typically used for span calibration. Zero gas may be required for full calibration cycles.
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