MQ3 Alcohol Gas Sensor

• Sensor Type - Semiconductor
• Easy SIP header interface
• Compatible with most of the microcontrollers
• Low-power standby mode
• Requires heater voltage
• Good sensitivity to alcohol gas
• Fast response and High sensitivity  
• Long life and low cost
• Requires simple Drive circuit

Specifications of MQ-3 Gas Sensor

• Power requirements: 5 VDC @ ~165 mA (heater on) / ~60 mA (heater off)
• Current Consumption: 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
• Detecting Concentration: 0.05-10mg/L Alcohol
• Interface: 1 TTL compatible input (HSW), 1 TTL compatible output (ALR)
• Heater consumption: less than 750mW
• Operating temperature: 14 to 122 °F (-10 to 50°C)
• Load resistance: 200kΩ
• Sensitivity S: Rs(in air)/Rs(0.4mg/L Alcohol)≥5
• Sensing Resistance Rs: 2KΩ-20KΩ(in 0.4mg/l alcohol)
• Dimensions: 32 x 22 x 16 mm