Gas Sensor MQ-2 Sensitive Smoke & Flammable Gases

MQ2 is a semiconductor sensor which can detect smoke and flammable gases at concentrations from 300 to 10,000 ppm. The sensitive material used for this sensor is SnO₂, whose conductivity is lower in clean air. It’s conductivity increases as the concentration of combustible gases increases. This sensor has high sensitivity to Hydrogen, Propane, LPG, Methane and other combustible steams. This can be used to detect gas leakage in industries and houses. MQ2 gas sensor can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi. You may also use a comparator to convert analog output to digital and a preset can be used along with it to adjust sensitivity.

Applications

• Domestic gas leakage detector
• Industrial combustible gas detector
• Portable gas detector

Features

• Wide detecting scope
• Stable and long life
• High sensitivity
• Fast response
• Low cost
• Long Life
• Simple drive circuit
• Fast response and High sensitivity
• Analog and Digital Outputs
• Trigger Level configuration Potentiometer

Specifications

• Sensor Type : Semiconductor
• Standard Encapsulation : Black Bakelite
• Detection Gas : Combustible Gas and Smoke
• Concentration : 300 – 10000ppm
• Circuit Voltage : 5V ±0.1 AC or DC
• Heating Voltage : 5V ±0.1 AC or DC
• Load Resistance : Adjustable depending on sensitivity
• Heater Resistance : 33Ω ±5% at room temperature
• Heating Consumption : < 800mW
   
• Operating Voltage: DC 5V
• Analog Output (AO): 0~5V analog output voltage
• Digital Outout (DO): 0V or 5V output
• Configuration: Through Potentiometer (adjusts the output level transition)
• Preheat Duration: 20s
• Weight: 5g
• Dimensions: 23 x 19 x 19 mm

Pinout

1. VCC (+5V)
2. GND (0V)
3. DO (Digital Out)
4. AO (Analog Out)