Datasheet MQ-2 (Winsen) - 3

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsen-sensor.com
MQ-2 Semiconductor Sensor for Flammable Gas Profile
Sensitive material of MQ-2 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-2 gas sensor has high sensitivity to propane and smoke, also can detect the natural gas and other flammable steam wel . It is with low cost and suitable for different applications of detecting kinds of flammable gases.
Features
It has good sensitivity to propane, smoke &etc in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Main Applications
It is widely used in domestic gas leakage alarm, industrial flammable gas alarm and portable gas detector.
Technical Parameters Stable.1
Model MQ-2 Sensor Type Semiconductor Standard Encapsulation Bakelite, Metal cap Target Gas Flammable gas, smoke Detection range 300～10000ppm(flammable gas) Loop Voltage Vc 5.0V±0.1V DC Standard Circuit Heater Voltage V Conditions H 5.0V±0.1V AC or DC Load Resistance RL Adjustable Heater Resistance RH 30Ω±3Ω（room temp.） Sensor character Heater consumption PH ≤950mW under standard Sensitivity S Rs(in air)/Rs(2000ppm C3H8)≥5 test conditions Output Voltage Vs 2.5V～4.0V（in 2000ppmC3H8） Concentration Slope α ≤0.6(R3000ppm/R1000ppm C3H8) Tem. Humidity 20℃±2℃；55%±5%RH Vc:5.0V±0.1V； Standard test circuit VH:5.0V±0.1V Standard test Preheat time Not less than 48 hours conditions 21%（not less than 18%） O2 content O2 concentration effects initial value,
Fig1.Sensor Structure
sensitivity and repeatability.
Unit: mm Tolerance:
±
0.1mm
Lifespan 10 years NOTE: Output voltage (Vs) is VRL in test environment. Tel: 86-371-67169097/67169670 Fax: 86-371-60932988 Email: [email protected]
Leading gas sensing solutions supplier in China! Fig1.Sensor Structure Unit: mm Tolerance:
±
0.1mm
Document Outline Flammable Gas Sensor Instructions: The above fig is the basic test circ Resistance of Sensitive materials (Rs)=(Vc/VRL-1)× Power consumption of Sensitive materials (Ps)=Vc2×