MQ-5B Semiconductor Sensor for Flammable Gas
Household flammable Gas Sensor
*It is widely used in domestic gas leakage alarm, industrial flammable gas alarm and portable gas detector.
- *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.
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.
|Target Gas||LPG, CH4|
|Standard Circuit Conditions||Loop Voltage||Vc||≤24V DC|
|Heater Voltage||VH||5.0V±0.1V AC or DC|
|Sensor character under standard test conditions||Heater Resistance||RH||29Ω±3Ω (room temp.)|
|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.|
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