Product ID: 1176 The MQ-2 is a flammable gas and smoke sensor detects the concentrations of combustible gas in the air and outputs its reading as an analog voltage. The sensor can measure concentrations of flammable gas of 300 to 10,000ppm. The MQ-2 gas sensor is sensitive to LPG, i-butane, propane, methane, alcohol, Hydrogen and smoke. They are used in gas leakage detecting equipments in family and industry and in portable gas detector. Supply Voltage: 5V Sensitive to H2, LPG, CH4, CO, Alcohol, Smoke or Propane Analog and Digital Output Digital Out is high or low based on a adjustable preset threshold.
Product ID: 1291 Testing gas: Carbon Monoxide Detection of concentration: 10-1000ppmCO Loop voltage: 10V DC Heater voltage: 5V±0.2V ACorDC(high), 1.5V±0.1V ACorDC(low) Load resistance: adjustable Heating resistor: 31±3(indoor temperature) Heating dissipation: 350mW Sensitive part surface resistance: 2K-20K Sensitivity: Rs(in air)/Rs(100ppmCO)5 Concentration gradient: 0.6 Temperature, humidity: 20±2, 65%±5%RH Standard test circuit: Vc c : 5v ±0.1v, Vh(high): 5v ±0.1v, Vh(low): 1.5v ±0.1v
Product ID: 1289 MQ-4 Sensor Description: Sensitive material MQ-4 gas sensor is used to clean the air in the lower conductivity of tin dioxide (SnO2). When there is the environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases. MQ-4 gas sensor of high sensitivity for methane, propane, butane and has a good sensitivity. This sensor can detect a variety of combustible gases, especially natural gas, is a low-cost sensor for a variety of applications. Electrical properties: Input voltage : DC5V Power consumption ( current ): 150mA DO output : TTL digital 0 and 1 ( 0.1 and 5V) AO output :0.1-0 .3 V ( relative to pollution ) , the maximum concentration of a voltage of about 4V Special note: After the sensor is powered , needs to warm up around 20S, measured data was stable , heat sensor is a normal phenomenon , because the internal heating wire , if hot is not normal .