MQ-137 Ammonia Gas Detection Sensor - 5-500 ppm NH₃
The MQ-137 is a semiconductor ammonia (NH₃) gas sensor module with a detection range of 5–500 ppm, designed for integration with 5V microcontroller systems like Arduino, Raspberry Pi, and ESP32 for air quality monitoring and gas leak detection applications.
Features
- Semiconductor SnO₂ sensor for ammonia (NH₃) detection.
- Wide detection range from 5 to 500 ppm.
- Operates with a 5.0V ±0.1V heater voltage and ≤24V DC loop voltage.
- High sensitivity also extends to organic amines like trimethylamine.
- Compact module with simple analog output for easy system integration.
Out of stock
The MQ-137 ammonia gas sensor utilizes a tin dioxide (SnO₂) semiconductor sensing element. In clean air, the sensor’s conductivity is low. When exposed to ammonia gas, the conductivity increases proportionally to the gas concentration, allowing measurement via a simple voltage divider circuit. The integrated heater stabilizes the sensing surface for consistent performance.
Designed for durability and long-term operation, this sensor requires a preheating period before stable readings are achieved. It is suitable for integration into both portable detectors and fixed monitoring systems, providing a reliable and cost-effective solution for ammonia detection in agricultural, industrial safety, and indoor air quality scenarios.
Additional Information
| Weight | 0.005 kg |
|---|---|
| Dimensions | 4 × 3 × 3 cm |
