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Detect Gas Changes with a Practical Air Sensor
The Gas Sensor MQ-131 Ozone Module is a gas sensor designed for air-quality projects, leak alerts, and ventilation monitoring. It is a practical fit for makers, students, and engineers who want reliable sensor data in embedded builds.
Key details include Interface: UART.
Important: Most gas and chemical sensors work best after warm-up and calibration. Readings can drift with temperature, humidity, and sensor age.
Why you’ll love it
- Key feature: the dual signal output (analog output, and TTL-level output);
- The analog output increases: the analog output increases with the concentration, the higher the voltage the higher the concentration;
- The ozone gas: the ozone gas with high sensitivity (detection concentration range 10PPB-2PPM Ozone)
- Useful spec: Semiconductor
- Easy wiring: UART
- Maker-friendly build: Easy to use in prototypes, classroom projects, and custom electronics
Compare with similar products
| Product | Sensor style | Standout |
|---|---|---|
| Gas Sensor MQ-131 Ozone Module | gas sensor | Current item |
| Gas CO Combustible Analog Sensor MQ9 For Arduino Gravity | gas sensor with analog output | analog output, gas detection |
| Gas Sensor MQ5 Analog LPG For Arduino | gas sensor with analog output | analog output, digital output |
| Gas Analog CH4 Gas Sensor MQ4 For Arduino | gas sensor with analog output | adjustable sensing range, analog output |
What you can build
This sensor is a good fit for gas leak alarms, indoor air monitors, safety demos, ventilation control, and science projects.
Starter bundles
Pair it with an Arduino-compatible board, ESP32, or Raspberry Pi, plus a breadboard or jumper wires for quick setup and testing.
Recommended add-ons
Useful add-ons include fresh-air test setup, an enclosure with vents, and a display for local readout, depending on how you plan to power, mount, and log the sensor.
Technical specifications
| Product | Gas Sensor MQ-131 Ozone Module |
|---|---|
| Model No. | MQ-131 |
| Sensor Type | Semiconductor |
| Preheat time | Over 48 hours |
| Detection Gas | Ozone |
| Concentration | 10PPB-2PPM Ozone |
| Standard test circuit | Vc:5.0V±0.1V VH: 5.0V±0.1V |
| Standard Encapsulation | Stainless steel |
| Interface | UART |
Wiring & usage notes
Connect power and ground, then wire TX and RX to a serial-capable controller at the correct logic level and baud rate. Most gas and chemical sensors work best after warm-up and calibration. Readings can drift with temperature, humidity, and sensor age.
What’s in the box
1 × Gas Sensor MQ-131 Ozone Module
Frequently Asked Questions
What does the Gas Sensor MQ-131 Ozone Module measure?
It is designed to measure gas concentration changes in air.
Can I use it with Arduino, ESP32, or Raspberry Pi?
Yes. It is well suited for common maker and embedded platforms, as long as you power it at the correct voltage and match the signal level to your controller.
How do I connect this UART sensor?
This version uses UART or serial output, so you connect power plus TX and RX at the correct logic level.
Does it need calibration?
Yes. Chemical and gas sensors usually need warm-up time, calibration, and periodic checking if you want stable readings.
Is it good for prototyping?
Yes. It is a practical choice for learning, proof-of-concept builds, and small automation projects.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
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