Model: MQ-2Gas: smokeDetection range: 300 to 10000ppmmCharacteristic gas: 1000ppmm isobutaneSensitivity: R in air/Rin typical gasge5Sensitive body resistance: 1KOmega to 20KOmega in 50ppm tolueneResponse time: le10sRecovery time: le30sHeating resistance: 31 Omega plusmn 3 OmegaHeating current: le180mAHeating voltage: 5.0V plusmn 0.2VHeating power: le900mWMeasuring voltage: le24VWorking conditions Ambient temperature: -20 deg C ~ +55 deg CHumidity: le95% RHEnvironmental oxygen content: 21%Storage conditions Temperature: -20 deg C ~ +70 deg CHumidity: le70%RHApplications: Household and factory gas leak monitoring devices suitable for detection of liquefied gases, butane, propane, methane, alcohol, hydrogen, fumes, etc.

MQ-3 SensorGas: Alcohol (ethanol)Detection range: 10 ~ 1000ppm alcoholCharacteristic gas: 125ppm alcoholSensitivity: R in air/Rin typical gasge5Sensitive body resistance: 1 ~ 20KOmega in airResponse time: le10s (70% Response)Recovery time: le30s (70% Response)Heating resistance: 31 Omega plusmn 3 OmegaHeating current: le180mAHeating voltage: 5.0V plusmn 0.2VHeating power: le900mWMeasuring voltage: le24VAmbient temperature: -20 deg C ~ +55 deg CHumidity: le95% RHEnvironmental oxygen content: 21%Storage temperature: -20 deg C ~ +70 deg CStorage humidity: le70%RH

MQ-5 Sensor

Applicable gases: liquefied gas, methane, gasDetection range: 300 ~ 10000ppmCharacteristic gas: 1000ppm isobutaneSensitivity: R in air/R in typical gasge5Sensitive body resistance: 1KOmega～20KOmega in 2000ppm isobutaneResponse time: le10sRecovery time: le30sHeating resistance: 31 Omega plusmn 3 OmegaHeating current: le180mAHeating voltage: 5.0V plusmn 0.2VHeating power: le900mWMeasuring voltage: le24VAmbient temperature: -20 deg C ~ +55 deg CHumidity: le95% RHEnvironmental oxygen content: 21%Storage temperature: -20 deg C ~ +70 deg CStorage humidity: le70%RH

MQ-7 SensorProduct model: MQ-7Product type : Semiconductor gas sensorDetection gas: carbon monoxideDetection concentration: 10-1000ppmCOLoop voltage: le10V DCHeating 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): adjustableHeating resistance (RH): 31Omega plusmn 3Omega (room temperature)Heating power consumption (PH): le350mWSensitive surface resistance (Rs): 2KOmega-20KOmega (in100ppmCO)Sensitivity (S); Rs (in air) / Rs (100ppmCO) ge 5Concentration slope (alpha): le 0.6 (R300ppm/R100ppmCO)Temperature, humidity: 20 deg C plusmn 2 deg C; 65% plusmn 5% RHStandard test circuit: Vc: 5.0V plusmn 0.1V; VH (high): 5.0V plusmn 0.1V; VH (low): 1.5V plusmn 0.1VWarm-up time: no less than 48 hours

MQ135 SensorProduct model: MQ135Product Type: Semiconductor Gas SensorDetection gas: ammonia, sulfide, benzene vaporDetection concentration: 10-1000ppm (ammonia, toluene, hydrogen)Loop voltage (Vc): le24V DCHeating voltage (VH): 5.0V plusmn 0.2V ACorDCLoad resistance (RL): adjustableHeating resistance (RH): 31 Omega plusmn 3 Omega (room temperature)Heating power consumption (PH): le900mWSensitive surface resistance (Rs): 2KOmega-20KOmega (in 100ppm NH3)Sensitivity (S): Rs (in air) / Rs (100ppm NH3) ge 5Concentration slope (alpha): le 0.6 (R100ppm/R50ppmNH3)Temperature, humidity: 20 deg C plusmn 2 deg C; 65% plusmn 5% RHStandard test circuit: Vc: 5.0V plusmn 0.1V; VH: 5.0V plusmn 0.1VWarm-up time: no less than 48 hours