1 PC MQ303B Semiconductor Sensor for Alcohol Gas

Sensitive material of MQ303B gas sensor is semiconductor material which is with lower conductivity in clean air. When the target alcohol gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. Application It has high sensitivity to alcohol and quick response and resume, widely used in portable alcohol gas detector. Features High sensitivity, quick response and resume, long lifespan, low power consumption, low cost, small sizes.  Specifications Model MQ303B Sensor Type Semiconductor Standard Encapsulation Metal Target Gas Alcohol gas Detection range 20~ 500ppm alcohol Standard Circuit Conditions Loop Voltage V H 0.9V±0.1V AC or DC Heater Voltage V c ≤6V DC Load resistance R L Adjustable Heater Resistance RH 4.0Ω±0.5Ω（room temp.） Heater consumption PH ≤140mW Sensor character under standard test conditions Zero p