tailieunhanh - MQ-2 Semiconductor Sensor for Combustible Gas

Sensitive material of MQ-2 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-2 Semiconductor Sensor for Combustible Gas Sensitive material of MQ-2 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-2 gas sensor has high sensitity to LPG Propane and Hydrogen also could be used to Methane and other combustible steam it is with low cost and suitable for different application. Character Configuration Good sensitivity to Combustible gas in wide range High sensitivity to LPG Propane and Hydrogen Long life and low cost Simple drive circuit Application Domestic gas leakage detector Industrial Combustible gas detector Portable gas detector Basic test loop Technical Data T Model No. MQ-2 Sensor Type Semiconductor Standard Encapsulation Bakelite Black Bakelite Detection Gas Combustible gas and smoke Concentration 300-10000ppm Combustible gas Circuit Loop Voltage Vc 24V DC Heater Voltage Vh ACorDC Load Resistance Rl Adjustable Character Heater Resistance Rh 31C 3C Room Tem. Heater consumption Ph 900mW Sensing Resistance Rs 2KC-20KC in 2000ppm CH Sensitivity S Rs in air Rs 1000ppm isobutane 5 Slope a R5000ppm R3000ppm CH4 Condition Tem. Humidity 20 C 2 C 65 5 RH Standard test circuit Vc Vh Preheat time Over 48 hours Vc - VrO- GND Vrl 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 Ps Vc2xRs Rs RL 2 Resistance