MQ-5B 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 flammable gas (especially propane) in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Product Description:

Sensitive material of MQ-5B 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-5B gas sensor has high sensitivity to butane, propane, methane and can detect methane and propane at the same time. It also can detect kinds of flammable gases, especially LPG(propane). It is a kind of low–cost sensor for many applications.

Technical Parameters:
Model MQ-5B
Sensor Type Semiconductor
Standard Encapsulation Plastic
Target Gas LPG, CH4
Detection range 300~10000ppm(CH4,C3H8)
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 29Ω±3Ω (room temp.)
Heater consumption   PH   ≤950mW
Sensitivity S Rs(in air)/Rs( in 2000ppm C3H8)≥5
Output Voltage Vs 2.5V~4.0V (in 2000ppm C3H8)
Concentration Slope α ≤0.6(R3000ppm/R1000ppm C3H8)
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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