Description: 1. MQ-137 is a gas sensor module capable of detecting Ammonia (NH3) and other reducing gases, making it ideal for use in Ammonia leak detection and carbon monoxide (CO) indicator applications. 2. Components: This compact module integrates an MQ-137 sensor chip with a built-in heater, resistor, and voltage regulator. It also comes with a testing LED and buzzer for easy identification of gas presence. 3. Operating Principle: The MQ-137 gas sensor reacts chemically to the presence of ammonia and reducing gases by altering its resistance, which in turn affects the voltage output. 4. Sensing Range: The module can detect concentrations ranging from 50ppm (parts per million) to over 800ppm of NH3. For CO detection, it's typically used as a CO indicator with an alarm triggering when CO levels exceed the sensor's threshold. 5. Interfacing: The module can be interfaced with various microcontrollers and development boards, such as Arduino or Raspberry Pi, using analog input pins to measure v
| Specification | Details |
|---|---|
| Sensor Type | MQ-137 NH3 gas sensor |
| Sensitive to | Ammonia (NH3) CO |
| Operating Temperature Range | -20°C ~ 50°C |
| Humidity Range | 0% ~ 80% |
| Power Supply | 5V 1.8-2.4V |
| Current Consumption | 100mA @ 5V |
| Analog Output | 0-2.3V (voltage output) |
| Digital Output | TTL Active LOW |
| Response Time | 10-30 seconds |
| Stability Period | 20 minutes |
| Sensitivity Range | 0-100 ppm (NH3) 0-500 ppm (CO) |
| Calibration | Not required factory calibrated |
