MQ131 Ozone Gas Sensor Module — O3 Detection
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MQ131 Ozone Gas Sensor Module — O3 Detection
The MQ131 is a semiconductor gas sensor specifically designed to detect ozone (O3) concentration in the air. It uses a tin dioxide (SnO2) sensing element whose resistance changes in the presence of ozone. With both analog and digital outputs, it integrates easily with Arduino, ESP32, and other microcontrollers for air quality monitoring and ozone safety systems.
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 5V DC |
| Heater Voltage | 5V ±0.1V |
| Output Type | Analog (AO) + Digital (DO) |
| Target Gas | Ozone (O3) |
| Detection Range | 10 ppb – 2000 ppb |
| Preheat Time | ~20 seconds (minimum) |
| Operating Temperature | -20°C to +70°C |
| Operating Humidity | Less than 95% RH |
Pinout
| Pin | Name | Description |
|---|---|---|
| VCC | Power | 5V Supply |
| GND | Ground | Ground |
| DO | Digital Output | HIGH when gas exceeds threshold (adjustable) |
| AO | Analog Output | Voltage proportional to gas concentration |
Key Features
- Sensitive and selective to ozone (O3) gas
- Dual output: analog for precise readings, digital for threshold alerts
- Adjustable sensitivity via onboard potentiometer
- Compatible with Arduino, ESP32, STM32, PIC
- Simple 4-pin interface — easy to integrate
Applications
- Outdoor air quality monitoring stations
- Ozone safety alarms in industrial environments
- UV sterilizer ozone level monitoring
- Smart city environmental sensing
- Laboratory ozone detection systems