Semiconductor gas sensor

Key Specifications:

• Sensitive material of MQ3 gas sensor is SnO2, which with lower conductivity in clean air When the target alcohol gas exist
• Sensor's conductivity is more higher along with the gas concentration rising
• Please use simple electro-circuit, convert change of conductivity to correspond output signal of gas concentration
• MQ3 gas sensor has high sensitivity to alcohol, and has good resistance to disturb of gasoline, smoke and vapor
• The sensor could be used to detect alcohol with different concentration, it is with low cost and suitable for different application
• Features and application:
  • Good sensitivity to alcohol gas
  • Long lifespan and low cost
  • Simple drive circuit
  • Vehicle alcohol detector
  • Portable alcohol detector
  • Sensor type: semiconductor
  • Standard encapsulation: bakelite (black bakelite)
  • Detection gas: alcohol gas
  • Concentration: 0.4-4mg/L alcohol
  • Loop voltage (Vc): ≤24V DC
  • Heater voltage (VH): 5.0V ±0.2V Acor DC and 1.5V ±0.1V AC or DC
  • Load resistance (RL): adjustable
  • Heater resistance (RH): 31 ±3Ω (room temperature)
  • Heater consumption (PH): ≤900mW
  • Sensing resistance (Rs): 2 to 20kΩ (in 0.4mg/L alcohol)
  • Sensitivity (S): Rs (in air)/Rs (0.4mg/L alcohol) ≥5
  • Slope (α): ≤0.6 (R300ppm/R100ppm alcohol)
  • Temperature humidity: 20 ±2℃, 65 ±5%RH
• Standard test circuit:
  • Vc: 5.0V ±0.1V
  • VH (high): 5.0V ±0.1V
  • VH (low): 5.0V ±0.1V
• Preheat time: over 48 hours