MQ-4B Semiconductor Sensor for Flammable Gas

Household flammable Gas Sensor

Applications :

*It is widely used in domestic gas leakage alarm, industrial flammable gas alarm and portable gas detector.

Product Advantages:
  • *It has good sensitivity to methane in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Product Description:

Sensitive material of MQ-4B gas sensor is SnO2, which with lower conductivity in clean air. When the target flammable gas exist, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.MQ-4B gas sensor has high sensitivity to methane, also has anti-interference to alcohol and other gases.

Technical Parameters:
Model MQ-4B
Sensor Type Semiconductor
Standard Encapsulation Plastic
Target Gas Methane
Detection range 300~10000ppm(CH4)
Standard Circuit Conditions Loop Voltage Vc ≤24V DC
Heater Voltage VH 5.0V±0.1V AC or DC
Load Resistance RL Adjustable
Sensor character under standard test conditions Heater Resistance RH 26Ω±3Ω(room temp.)
Heater consumption PH   ≤950mW
Sensitivity S Rs(in air)/Rs(in 5000ppmCH4)≥5
Output Voltage Vs 2.5V~4.0V (in 5000ppm CH4)
Concentration Slope α ≤0.6(R5000ppm/R1000ppm CH4)
Standard test conditions Tem. Humidity 20℃±2℃;55%±5%RH
  Standard test circuit Vc:5.0V±0.1V; VH:5.0V±0.1V
Preheat time Not less than 48 hours
O2 content 21%(not less than 18%) O2 concentration effects initial value, sensitivity and repeatability.
Lifespan 10 years
 
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