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MQ-9 Gas Sensor Module For Carbon Monoxide, Methane, and LPG Detector Module

MQ-9 Gas Sensor Module For Carbon Monoxide, Methane, and LPG Detector Module

₹133.00Price

🔥 MQ-9 Gas Sensor Module – CO, Methane & LPG Detector 

📌 Overview

The MQ-9 Gas Sensor Module is a versatile gas sensor designed to detect:

  • ☠️ Carbon Monoxide (CO)

  • 🔥 Methane (CH₄)

  • 🛢 LPG (Liquefied Petroleum Gas)

👉 Ideal for multi-gas detection in safety and IoT systems.

🧠 Working Principle

  • Uses SnO₂ (Tin Dioxide) sensing material

  • Clean air → low conductivity

  • Gas present → conductivity increases

👉 Output changes as voltage depending on gas concentration

⚠️ Special Feature:

  • Dual heating cycle (similar to MQ-7):

    • 🔥 High temperature → detects methane & LPG

    • 🌡 Low temperature → improves CO detection

📊 Infographic Summary

┌──────────────────────────────┐
│ 🔥 MQ-9 GAS SENSOR │
├──────────────────────────────┤
│ 🎯 Detects: CO, CH₄, LPG │
│ ⚡ Voltage: 5V │
│ 📏 Range: 10–10,000 ppm │
│ 🔌 Output: Analog + Digital │
│ 🔁 Dual heating cycle │
│ 🔥 Multi-gas detection │
└──────────────────────────────┘

🔌 Pin Configuration

┌──────────────┐
│ MQ-9 Module │
├──────────────┤
│ VCC → 5V
│ GND → Ground
│ AO → Analog
│ DO → Digital
└──────────────┘

⚙️ Key Specifications

  • ⚡ Operating Voltage: 5V DC

  • 📏 Detection Range: 10 – 10,000 ppm

  • 🔌 Output:

    • Analog (gas concentration)

    • Digital (threshold detection)

  • 🔥 Heater Consumption: ~150 mA

  • 🌡 Operating Temperature: -10°C to 50°C

🌟 Key Features

  • 🔥 Detects multiple gases

  • ⚡ Fast response time

  • 🔧 Easy to interface

  • 🎚 Adjustable sensitivity

  • 💰 Low cost

🧪 Applications

  • 🏠 Gas leakage alarm systems

  • 🚗 Vehicle exhaust monitoring

  • 🏭 Industrial safety

  • 🤖 IoT gas monitoring

  • 🔔 Multi-gas alarm systems

🔗 Interfacing

Compatible with:

  • 🔵 Arduino

  • 📡 ESP32 / ESP8266

  • 🍓 Raspberry Pi

👉 Use:

  • AO → measure gas level

  • DO → trigger alarm

🔄 Working Example

👉 Gas Leak Alarm:

  • Gas leaks detected

  • Sensor output rises

  • Microcontroller reads value

  • Buzzer/LED activates 🚨

⚠️ Important Notes

  • ⏳ Requires 24–48 hours preheating

  • ⚠️ Not highly selective (multiple gases trigger response)

  • ⚠️ Needs heater voltage cycling for accuracy

  • ⚠️ High power consumption

💬 Practical insight:

MQ-9 is great for detection, not precise measurement

🆚 MQ-9 vs MQ-7 vs MQ-4

SensorBest For
MQ-4Methane (CNG)
MQ-7Carbon Monoxide
MQ-9Multi-gas (CO + LPG + CH₄)

💡 Pro Tip

  • Combine with buzzer + relay for automatic shutdown systems

  • Use in ventilation control systems

👉 Best choice when you need multi-gas detection in one module

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