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.
Shimoyama 304 Stainless Steel Telescopic Rod - Kitchen Sink Cutting Board Support Rack for Dish Drying and Cloth Hanging
$74.80
Modified Wheel Lug Nuts Forged Steel High Strength for Lafesta Regal CT4 Civic Accord Crown Mazda3
$209.00
Milk Separator Machine - Electric Cream Skimmer and Butter Churn for Home and Commercial Use (Cow and Goat Milk)
$946.00
Three-Phase Auto-Reclosing Leakage Circuit Breaker - Smart Phase Loss, Undervoltage, Overload Protection with 485 Communication for PV Grid Connection
$693.20
Multi-Function Vegetable Cutter Commercial Electric for Cafeterias Fully Automatic Chili Scallion Chopper Imitation Hand-Cut Leek Machine
$1,600.00
Zhengtong ZT30 Fog Cannon - Micron-Level Humidification & Cooling Spray System for Steel Mills
$6,000.00
100Pcs Custom Clothing Hang Tags Personalized Plastic Securi
$125.94
Wall-Mounted Bathroom Storage Shelf, No-Drill Organizer for Sink, Shower, and Toilet Area
$5.76
Thickened 5mm Wool Felt Mat for Calligraphy Practice - Premium Writing Pad for Students and Beginners, Part of Four Treasures of the Study Set
$2.80
Multi-Function Car Tire Stone Removal Tool with Hook for Picking Out Rocks
$4.06
Label Stripping Machine – Semi-Automatic Unit for Beer, Baijiu, and Glass Bottle Label Removal; Custom Manufacturing Available
$19,980.00
High-Strength Manganese Steel Lifting Chain 6*18mm G80 Wear-Resistant Towing Chain
$84.34
Touchmark Acrylic Markers for Elementary Art, Washable Watercolor Pens for Kids' Drawing and Painting
$10.80
Official Flagship Store Steel Tongue Drum, C Key, 6-inch, 11 Notes, Carbon Steel Performance Grade Instrument for Kids and Students
$41.10
Outdoor Waterproof Backpack Camouflage Dry Bag with Wet/Dry Separation for Swimming, Rafting, and Trekking
$8.42
![[Save $50 on Order] Bundle: 5 Notebooks + 2 Pens + 20 Refills + 2 Grip Correctors](https://www.gosteppe.com/cache/small/product/270170/legacy-main-59be8c850af1ec303ad4901b.webp)
[Save $50 on Order] Bundle: 5 Notebooks + 2 Pens + 20 Refills + 2 Grip Correctors
$39.90
Sketching Tool Set for Art Students - Includes Blending Stumps, Tortillons, Paper Stumps, Sponge Balls, Cotton Swabs, Highlight Pens, Gray Tone Tools, Insert Knives, Smudging Knives, Scrapers, and Blending Cotton
$7.65
Suede Rope Korean Velvet Rope DIY Aromatherapy Candle Plaster Tag Hanging Cord Packaging Gift Box Ribbon Decorative Leather Rope
$0.85
![[Damai Holds Microneedle Hair Transplant Patent] Hair Collagen | Improves Hair Loss, Nourishes Dermis and Follicles](https://www.gosteppe.com/cache/small/product/270167/legacy-main-9c6481bdd960acdf68495a0e.webp)
[Damai Holds Microneedle Hair Transplant Patent] Hair Collagen | Improves Hair Loss, Nourishes Dermis and Follicles
$1,980.00
Selected Factory Low-Temperature 3D Printing Pen for Kids, Children's 3D Printing Pen Set, 3D Drawing Pen
$100.02
Milk Pasteurization Line - Small-Scale Yogurt Production Machine for Liquid Yogurt and Pasteurized Milk
$8,148.00
Commercial Small Heating Warmer Cabinet, Glass Constant-Temperature Countertop Display Case for Egg Tarts, Burgers, and Fried Chicken
$884.00
Custom Seal Stamp Engraving Personal Name Phone Number Private Chop
$5.89
Commercial Food Warmer Cabinet for Milk, Soy Milk, Burgers, Egg Tarts, Fried Chicken, Pies, Youtiao, and Bread Display
$1,355.00
PJ0040 Rose Embossed Cross Silicone Mold - For Candles, Aromatherapy, Soap, Plaster, and DIY Crafts
$11.20
Yuwell Oxygen Concentrator Control Board Motherboard 8F-3AW/8F-5AW/9F-5BW
$120.00
Leyingfang Floating Pen for Kids and Students - Water-Based Non-Toxic Erasable Whiteboard Pen for Drawing in Water, Large Capacity Suspension Pen
$18.00
Car Wheel Lug Nut Covers - Colorful Silicone Dust-Proof and Rust-Proof Caps for Tire Bolt Protection and Exterior Styling
$8.80
Automatic Stainless Steel Vegetable Slicer for Ginger, Potatoes, Carrots, Onions, and Cabbage - Commercial Dicing Machine
$3,951.36
![[Damai Holds Micro-Needle Hair Transplant Patent] Top Thinning Hair Transplant | Micro-Needle Density Enhancement (500 Units)](https://www.gosteppe.com/cache/small/product/270156/legacy-main-525bdaff56f89ee94752ef9c.webp)
[Damai Holds Micro-Needle Hair Transplant Patent] Top Thinning Hair Transplant | Micro-Needle Density Enhancement (500 Units)
$7,000.00
![[Youxin Electronics] GP2Y0E03 Infrared Distance Sensor Module 4-50cm Range](https://www.gosteppe.com/cache/medium/product/74667/legacy-main-4da8cadc5fc82afe91b124e3.webp)
![[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set](https://www.gosteppe.com/cache/medium/product/208273/legacy-main-9ec245ebf781f65a434ba854.webp)
