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The MQ-9 Gas Sensor Module is a versatile gas detection module capable of sensing carbon monoxide (CO) and various flammable gases, making it suitable for applications involving gas leakage detection and safety monitoring. This module operates on a typically recommended voltage of 5V DC.

The gas sensing element within the module operates on a heater voltage of typically 5V, and it uses a semiconductor-based gas sensing principle to detect the presence of specific gases. It provides an analog voltage signal that varies based on the concentration of the detected gas.

Common gases detected by the MQ-9 module include carbon monoxide (CO) and various flammable gases like methane, propane, and hydrogen. The detection range and sensitivity may vary depending on the specific gas being sensed.

It's important to note that the MQ-9 Gas Sensor Module requires a preheat time of a few minutes for the sensor to stabilize before accurate gas detection can occur. During this warm-up period, the module should be powered but may not provide accurate readings.

The module typically provides an analog output signal that can be interfaced with a microcontroller or ADC (Analog-to-Digital Converter) for gas concentration measurement. Some variants of this module may include a digital output option for simplified gas detection interfacing.

Applications for the MQ-9 Gas Sensor Module include gas leakage detection in homes, industries, and commercial spaces, as well as safety monitoring systems.

Specificatoins of MQ-9 Carbon Monoxide & Flammable Gas Sensor Module:

  • Type: Gas Sensor Module
  • Gas Detected: Carbon Monoxide (CO) and flammable gases (e.g., methane, propane, hydrogen)
  • Detectable Concentration:10-1000ppmCO, 100-10000PPM gas
  • Operating Voltage: 5V DC
  • Power (current): 150mA
  • Output Signal: Analog voltage signal (resistance variation based) , Digital
  • DO Output: TTL digital 0 and 1 (0.1 and 5V)
  • AO Output: 0.1-0.3V (relatively clean), the highest concentration voltage is about 4V
  • Preheat Time: Typically a few minutes (for the sensor to stabilize)
  • Warm-Up Period: Required before accurate gas detection
  • Interface: Analog output, digital output (optional)
  • Dimensions: 32x20x22 mm

Features of MQ-9 Carbon Monoxide & Flammable Gas Sensor Module:

  • Versatile Gas Detection: Capable of detecting carbon monoxide (CO) and various flammable gases.
  • Analog Output: Provides an analog voltage signal that varies with gas concentration.
  • Compact Design: Compact and module-specific, suitable for integration into various systems.
  • Usage Tip:
  • Allow the module to preheat for a few minutes to ensure accurate gas detection. Calibrate and test the module in the specific gas environment of your application to establish baseline readings and thresholds for gas concentration alerts.
  • When the sensor is powered, it needs to be warmed up about 20S, so the measured data becomes stable, the heat sensor is a normal phenomenon, because its inside is with an electric wire, if not, unnomal.
  • Caution:
  • Use this gas sensor module in environments where gas leaks or the presence of carbon monoxide may pose safety risks. Follow safety guidelines and standards for gas detection and ventilation in such environments.
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