MQ-2, MQ-3, MQ-7 or MQ-135 Gas Sensor Module, Smoke, Alcohol and CO Detection

MQ-2 Sensor Model: MQ-2 Gas: smoke Detection range: 300 to 10000ppmm Characteristic gas: 1000ppmm isobutane Sensitivity: R in air/Rin typical gasge5 Sensitive body resistance: 1KOmega to 20KOmega in 50ppm toluene Response time: le10s Recovery time: le30s Heating resistance: 31 Omega plusmn 3 Omega Heating current: le180mA Heating voltage: 5.0V plusmn 0.2V Heating power: le900mW Measuring voltage: le24V Working conditions Ambient temperature: -20 deg C ~ +55 deg C Humidity: le95% RH Environmental oxygen content: 21% Storage conditions Temperature: -20 deg C ~ +70 deg C Humidity: le70%RH Applications: Household and factory gas leak monitoring devices suitable for detection of liquefied gases, butane, propane, methane, alcohol, hydrogen, fumes, etc. MQ-3 Sensor Gas: Alcohol (ethanol) Detection range: 10 ~ 1000ppm alcohol Characteristic gas: 125ppm alcohol Sensitivity: R in air/Rin typical gasge5 Sensitive body resistance: 1 ~ 20KOmega in air Response time: le10s (70% Response) Recovery time: le30s (70% Response) Heating resistance: 31 Omega plusmn 3 Omega Heating current: le180mA Heating voltage: 5.0V plusmn 0.2V Heating power: le900mW Measuring voltage: le24V Ambient temperature: -20 deg C ~ +55 deg C Humidity: le95% RH Environmental oxygen content: 21% Storage temperature: -20 deg C ~ +70 deg C Storage humidity: le70%RH MQ-7 Sensor Product model: MQ-7 Product type : Semiconductor gas sensor Detection gas: carbon monoxide Detection concentration: 10-1000ppmCO Loop voltage: le10V DC Heating voltage (VH): 5.0V plusmn 0.2V ACorDC (high) 1.5V plusmn 0.1VACorDC (low) Heating time (TL): 60plusmn1S (high) 90plusmn1S (low) Load resistance (RL): adjustable Heating resistance (RH): 31Omega plusmn 3Omega (room temperature) Heating power consumption (PH): le350mW Sensitive surface resistance (Rs): 2KOmega-20KOmega (in100ppmCO) Sensitivity (S); Rs (in air) / Rs (100ppmCO) ge 5 Concentration slope (alpha): le 0.6 (R300ppm/R100ppmCO) Temperature, humidity: 20 deg C plusmn 2 deg C; 65% plusmn 5% RH Standard test circuit: Vc: 5.0V plusmn 0.1V; VH (high): 5.0V plusmn 0.1V; VH (low): 1.5V plusmn 0.1V Warm-up time: no less than 48 hours MQ135 Sensor Product model: MQ135 Product Type: Semiconductor Gas Sensor Detection gas: ammonia, sulfide, benzene vapor Detection concentration: 10-1000ppm (ammonia, toluene, hydrogen) Loop voltage (Vc): le24V DC Heating voltage (VH): 5.0V plusmn 0.2V ACorDC Load resistance (RL): adjustable Heating resistance (RH): 31 Omega plusmn 3 Omega (room temperature) Heating power consumption (PH): le900mW Sensitive surface resistance (Rs): 2KOmega-20KOmega (in 100ppm NH3) Sensitivity (S): Rs (in air) / Rs (100ppm NH3) ge 5 Concentration slope (alpha): le 0.6 (R100ppm/R50ppmNH3) Temperature, humidity: 20 deg C plusmn 2 deg C; 65% plusmn 5% RH Standard test circuit: Vc: 5.0V plusmn 0.1V; VH: 5.0V plusmn 0.1V Warm-up time: no less than 48 hours