MQ-3

MQ-3 Semiconductor Sensor for Alcohol Sensitive material of MQ-3 gas sensor is SnO2, which with lower conductivity in clean air. When the target alcohol 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-3 gas sensor has high sensitity to Alcohol, and has good resistance to disturb of gasoline, smoke and vapor. The sensor could be used to detect alcohol with different concentration, it is with low cost and suitable for different application. Character * Good sensitivity to alcohol gas * Long life and low cost * Simple drive circuit Configuration Application * Vehicel alcohol detector * Portable alcohol 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 Heater consumption PH Character Sensing Resistance Rs Sensitivity S Slope α Tem. Humidity Condition Standard test circuit Preheat time Ps=Vc2×Rs/(Rs+RL)2 MQ-3 Semiconductor Bakelite (Black Bakelite) Alcohol gas 0.04-4mg/l alcohol ≤24V DC 5.0V±0.2V AC or DC Adjustable 31Ω±3Ω（Room Tem.） ≤900mW 2KΩ-20KΩ(in 0.4mg/l alcohol ) Rs(in air)/Rs(0.4mg/L Alcohol)≥5 ≤0.6(R300ppm/R100ppm Alcohol) 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...