MQ-4 PDF – Gas Sensor – Hanwei

Part Number : MQ-4

Function : Semiconductor Sensor

Manufactures : Henan Hanwei Electronics

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Description :

Henan Hanwei Electronics Co., Ltd www.hwsensor.com MQ-4 Semiconductor Sensor for Natural Gas Sensitive material of MQ-4 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration. MQ-4 gas sensor has high sensitity to Methane, also to Propane and Butane. The sensor could be used to detect different combustible gas, especially Methane, it is with low cost and suitable for different application. Character – Good sensitivity to Combustible gas in wide range – High sensitivity to Natural gas – Long life and low cost – Simple drive circuit Configuration Application – Domestic gas leakage detector – Industrial Combustible gas detector – Portable gas detector Technical Data Basic test loop Model No. Sensor Type Standard Encapsulation Detection Gas Concentration Loop Voltage Vc Circuit Heater Voltage Load Resistance VH RL Heater Resistance RH Character Heater consumption Sensing Resistance PH Rs Sensitivity S Slope α Tem. Humidity Condition Standard test circuit Preheat time MQ-4 Semiconductor Bakelite (Black Bakelite) Natural gas/ Methane 300-10000ppm ( Natural gas / Methane) ≤24V DC 5.0V±0.2V ACorDC Adjustable 31Ω±3Ω(Room Tem.) ≤900mW 2KΩ-20KΩ(in 5000ppm CH4 ) Rs(in air)/Rs(5000ppm CH4)≥5 ≤0.6(R5000ppm/R3000ppm CH4) 20℃±2℃;65%±5%RH Vc:5.0V±0.1V; VH: 5.0V±0.1V Over 48 hours Vc VRL RL VH GND The above is basic test circuit of the sensor. The sensor need to be put 2 voltage, heater voltage(VH)and test voltage(VC). VH used to supply certified working temperature to the sensor, while VC used to detect voltage (VRL) on load resistance (RL)whom is in series with sensor. The sensor has light polarity, Vc need DC power. VC and VH could use same power circuit with precondition to assure performance of sensor. In order to make the sensor with better performance, suitable RL value is needed: Power of Sensitivity body(Ps): Tel: 86-371-67169070/80 Fax: 86-371-67169090 Email: sales@hwsensor.com Henan Hanwei Electronics Co., Ltd Ps=Vc2×Rs/(Rs+RL)2 Resistance of sensor(Rs): Rs=(Vc/VRL-1)×RL www.hwsensor.com Rs/Ro Rs/R0 Sensitivity Characteristics MQ-4 10 Fig.1 1 0.1 100 LPG CH4 H2 C烟O 雾 alcohol smoke Air 1000 ppm 10000 Fig.1 shows the typical sensitivity characteristics of the MQ-4, ordinate means resistance ratio of the sensor (Rs/Ro), abscissa is concentration of gases. Rs means resistance in different gases, Ro means resistance of sensor in 1000ppm Methane. All test are under standard test conditions. P.S.: Sensitivity to smoke is ignite 10pcs cigarettes in 8m3 room, and the output equals to 200ppm Methane Structure and configuration Influence of Temperature/Humidity 1.9 1.7 Fig2 60%RH 1.5 30%RH 85%RH 1.3 1.1 0.9 0.7 0.5 -20 – […]

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MQ-4 Datasheet