The AO-03 oxygen sensor has a wide range of applications in mining, steel production, petrochemical and air monitoring industries. It can be used in devices such as oxygen alarms in mines, air quality monitors and commercial air purifiers. The data in this document are accurate for 3 months from the sensor’s manufacture date, under the conditions of 20° C, 50% RH and 1013 mbar. Please follow the instructions carefully when operating the oxygen analyzer and replacing the oxygen sensor.
The Oxygen Sensor Model AO-03 is an electrochemical sensor designed to measure oxygen concentration in air from 1% to 25% by volume. It delivers a stable current output and is ideal for integration into fixed gas monitors, portable analyzers and industrial safety systems.
Key Features of Oxygen Sensor Model AO-03
Output Signal: 0.1 ± 0.03 mA in air for direct current measurement
Measurement Range: 1%–25% Vol. O₂ for applications requiring broad detection
Fast Response Time: T90 < 15 s ensures rapid detection of oxygen changes
Operating Conditions: 0–50 °C temperature range; atmospheric pressure ±20%
Plug-and-Play Design: Simple installation into onboard sensor slots
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Applications and Use Cases
Mine safety systems for continuous monitoring of oxygen levels underground
Steel and metal processing plants to prevent oxidizing or reducing atmospheres
Petrochemical facilities for detecting oxygen in process streams
Air quality monitors and commercial air purifiers to ensure safe indoor environments
Environmental stations measuring ambient oxygen concentration for research
How to Use Oxygen Sensor Model AO-03
Mount the AO-03 into your analyzer’s sensor socket, ensuring correct orientation. Connect the sensor leads to a constant-current measurement circuit. Allow a 2 minutes warm-up at 20 °C and calibrate using certified zero and span gas mixtures. Replace the sensor every three months or sooner if output drift exceeds 0.03 mA.
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Frequently Asked Questions
What is the recommended calibration interval for the AO-03?
Under standard conditions (20 °C, 50% RH, 1013 mbar), calibrate the AO-03 every three months to maintain accuracy.
Can the AO-03 detect oxygen concentrations below 1%?
No. The measurement range of the AO-03 is 1% to 25% Vol. O₂. Below 1%, readings may not be reliable.
How quickly does the sensor respond to changes in oxygen levels?
The AO-03 achieves 90% of its final reading in less than 15 seconds (T90), making it suitable for fast-response applications.
The Oxygen Sensor Model AO-03 is a versatile gas and dust sensor used across a wide range of applications including air quality monitoring, gas leak detection, industrial safety, HVAC systems, and environmental monitoring.
Common use cases:
Building a gas leak alarm for LPG/methane
Monitoring indoor air quality (CO2, VOC)
Dust monitoring in a workshop
This product is ideal for environmental engineers, safety professionals, and IoT developers.
Technical Tip: MQ-series sensors need a warm-up period (24-48 hours for first use). Calibrate in clean air for accurate readings.
Shipping & Delivery
Free shipping on orders above ₹999 across India
Dispatched within 1-3 business days
Expected delivery: 3-7 business days depending on location
Secure packaging to ensure safe transit of electronic components
15 Days Warranty
Please note that this item is only covered by a standard supplier warranty against manufacturing defects for a period of 15days from the time of delivery. It is important to understand that only manufacturing defects are covered under this warranty, and any other issues will not be considered for reimbursement or replacement. We strongly advise inspecting the product upon delivery to ensure it meets your expectations. In case of any manufacturing defects, we guarantee reimbursement or replacement.
What voids warranty:
If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.
Mukesh Garg (verified owner) –
Pretty good Oxygen Sensor Model AO-03. Documentation could be better but the sensor itself is solid.
Utkarsh Parekh (verified owner) –
Great Oxygen Sensor Model AO-03. Using it in my smart agriculture system. Reliable measurements every time.
Aanya Tiwari –
This Oxygen Sensor Model AO-03 is a must-have for sensor projects. Plug and play with Arduino.
Gaurav Hegde (verified owner) –
Good quality Oxygen Sensor Model AO-03. Some variation in readings but within acceptable range.
Kabir Chauhan (verified owner) –
Perfect Oxygen Sensor Model AO-03 for my automation project. Integrates seamlessly with my microcontroller.
Kabir Grewal (verified owner) –
Average Oxygen Sensor Model AO-03. Readings fluctuate a bit. Works for rough measurements.
Tushar Dave (verified owner) –
Excellent Oxygen Sensor Model AO-03! Readings are accurate and consistent. Perfect for my project.
Kiara Mukherjee –
Good Oxygen Sensor Model AO-03. Works as described. Calibration needed some patience but results are good.
Lakshya Patil (verified owner) –
Great quality Oxygen Sensor Model AO-03. Calibrated it easily and the accuracy is impressive.
Krishna Pandey (verified owner) –
Pretty good Oxygen Sensor Model AO-03. Documentation could be better but the sensor itself is solid.
Rishabh Kumar –
Pretty good Oxygen Sensor Model AO-03. Documentation could be better but the sensor itself is solid.
Ajay Rawat (verified owner) –
Love this Oxygen Sensor Model AO-03. Response time is fast and readings are stable.
Gaurav Vohra (verified owner) –
Perfect for my weather station. This Oxygen Sensor Model AO-03 gives consistent readings day and night.
Vivek Grewal (verified owner) –
Average Oxygen Sensor Model AO-03. Readings fluctuate a bit. Works for rough measurements.
Kritika Rajan (verified owner) –
Perfect for my weather station. This Oxygen Sensor Model AO-03 gives consistent readings day and night.
Sanya Verma (verified owner) –
This Oxygen Sensor Model AO-03 is a must-have for sensor projects. Plug and play with Arduino.
Vansh Saini (verified owner) –
Great quality Oxygen Sensor Model AO-03. Calibrated it easily and the accuracy is impressive.
Suresh Batra (verified owner) –
Very satisfied with this Oxygen Sensor Model AO-03. Library support is good and it’s easy to interface.
Manish Dubey –
Decent Oxygen Sensor Model AO-03 for the price. Requires proper wiring but works well once set up.
Hitesh Rajan (verified owner) –
Superb Oxygen Sensor Model AO-03! Using it in my environmental monitoring system. Very reliable data.
Shivam Rajan (verified owner) –
Great quality Oxygen Sensor Model AO-03. Calibrated it easily and the accuracy is impressive.
Deepika Khanna (verified owner) –
Very satisfied with this Oxygen Sensor Model AO-03. Library support is good and it’s easy to interface.
Shreyas Desai (verified owner) –
Perfect Oxygen Sensor Model AO-03 for my automation project. Integrates seamlessly with my microcontroller.
Mohit Joshi (verified owner) –
Nice Oxygen Sensor Model AO-03. Readings are mostly accurate. Good enough for my hobby project.
Aman Ghosh (verified owner) –
Nice Oxygen Sensor Model AO-03. Readings are mostly accurate. Good enough for my hobby project.
Arun Pillai –
Great quality Oxygen Sensor Model AO-03. Calibrated it easily and the accuracy is impressive.
Parth Mittal (verified owner) –
This Oxygen Sensor Model AO-03 is a must-have for sensor projects. Plug and play with Arduino.
Lakshya Khanna (verified owner) –
Bought this Oxygen Sensor Model AO-03 for my college project. Accurate readings, easy to code. Very happy!
Tanya Jain (verified owner) –
This Oxygen Sensor Model AO-03 is excellent for the price. My data logging project is working perfectly now.
Zubin Saxena –
Outstanding accuracy from this Oxygen Sensor Model AO-03. Compared with a professional instrument, readings match closely.
Jai Grewal (verified owner) –
Great quality Oxygen Sensor Model AO-03. Calibrated it easily and the accuracy is impressive.