MQ-4B 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 methane in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
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.
|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||26Ω±3Ω(room temp.)|
|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.|
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