Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Brand | ASAIR Aosong |
| Model Number | AO-03 (4OXV) |
| Sensor Type | Electrochemical Oxygen Sensor |
| Measurement Range | 0-25% O2 |
| Output Signal | Analog Voltage |
| Operating Temperature | -20°C to +50°C |
| Response Time | < 15 seconds |
| Expected Lifespan | 2 Years in Air |
| Interface | 3-Pin Connector |
| Application | Industrial Safety & HVAC Monitoring |
Anonymous
Mar 22, 2026
Rating: 5/5
Perfect for our ventilation prototypes
We integrated these AO-03 modules into our latest HVAC testing rig. The calibration was straightforward, and the output signal is very stable. Great value for industrial prototyping.
Anonymous
Mar 15, 2026
Rating: 4/5
Good precision for the price point
Compared to more expensive brands, this sensor offers about 95% of the performance at half the cost. Ideal for educational labs or non-critical industrial applications.
Anonymous
Mar 14, 2026
Rating: 5/5
Solid build quality
The probe housing feels durable and the connector is secure. No issues with noise interference in our control cabinet setup. Highly recommended for system integrators.
Anonymous
Mar 13, 2026
Rating: 5/5
Consistent performance in harsh environments
We have deployed ten of these in our warehouse storage areas. They handle the temperature fluctuations well and maintain accuracy over several months of continuous operation.
Anonymous
Mar 13, 2026
Rating: 4/5
Reliable readings, slow initial warm-up
The sensor provides accurate oxygen concentration data once warmed up. It takes about 2 minutes to stabilize fully, which is acceptable for our stationary monitoring units.
Anonymous
Mar 09, 2026
Rating: 5/5
Easy to interface with Arduino
Bought this for a custom air quality monitor project. The analog voltage output makes it incredibly easy to read with standard microcontrollers. Documentation could be better, but it works flawlessly.
Q: Is the output linear across the entire range?
A: Yes, the AO-03 provides a linear analog voltage output proportional to the oxygen concentration within its specified 0-25% range.
Q: What is the power supply requirement for this module?
A: The module operates on a standard 5V DC supply with a current consumption of approximately 10mA during normal operation.
Q: Can this be used to detect pure oxygen leaks?
A: This sensor is designed for measuring oxygen concentration in air up to 25%. It is not suitable for detecting pure oxygen environments or concentrations significantly higher than atmospheric levels.
Q: Does this sensor require regular calibration?
A: Yes, we recommend calibrating the AO-03 module every 6 months using fresh air (20.9% O2) as a reference to ensure maximum accuracy.
Q: How do I know when the sensor battery needs replacement?
A: The sensor output will gradually drift or fail to reach the expected voltage in fresh air when the electrochemical cell reaches the end of its lifespan, typically after 2 years.
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