Description
The MQ139 Freon Sensor Module is designed for detecting Halogen gases and Freon gases such as R11, R22, R113, R134A, R409A, and R410A in home or environmental applications. It provides both analog and digital outputs, making it simple to integrate with microcontrollers like Arduino, ESP32, or Raspberry Pi. With high sensitivity, fast response time, and reliable long-term stability, this module is an excellent choice for leak detection systems, HVAC maintenance, and air quality monitoring projects.
Features
- Wide Freon Detection: Suitable for R11, R22, R113, R134A, R409A, R410A, etc.
- Plug-and-Play Design: Onboard circuitry makes it easy to connect directly to MCUs.
- Dual Outputs: Provides both analog and TTL digital signals.
- Digital Output: Low-level TTL signal (easily read by microcontroller I/O).
- Analog Output: Voltage increases proportionally with Freon concentration.
- LED Indicators: Includes power and digital signal status LEDs.
- High Sensitivity: Detects Freon concentrations from 10 to 1000 ppm (R134A reference).
- Fast & Reliable: Quick response and recovery, with long operational life.
- Easy Mounting: Comes with pre-drilled mounting holes for permanent installation.
Specification
- Working Voltage: DC 5V
- Main Chip: LM393 comparator + MQ139 sensor probe
- Signal Output: Analog (AO) and TTL digital (DO)
- Digital Output: Low-level valid
- Detection Range: 10–1000 ppm (R134A reference)
- Clean Air Voltage: < 1.5V
- Size: 35 × 20 × 28 mm
- Weight: 14 g
Application
- Household Freon gas leak detection
- Environmental safety monitoring
- Refrigeration and HVAC system maintenance
- DIY electronics projects with Arduino/Raspberry Pi
- Laboratory gas detection experiments