MQ-3 Alcohol Gas Sensor Module

✅ Model No.: MQ-3
✅ Sensor Type: Semiconductor
✅ Standard Encapsulation: Bakelite (Black Bakelite)
✅ Target Gas: Alcohol gas
✅ Detection Concentration: 0.04–4 mg/L alcohol
✅ Loop Voltage (Vc): ≤ 24V DC
✅ Heater Voltage (VH): 5.0V ± 0.2V AC/DC
✅ Load Resistance (RL): Adjustable
✅ Heater Resistance (RH): 31 Ω ± 3 Ω (room temperature)
✅ Heater Consumption (PH): ≤ 900 mW
✅ Sensing Resistance (Rs): 2 kΩ–20 kΩ (in 0.4 mg/L alcohol)
✅ Sensitivity (S): Rs(in air) / Rs(0.4 mg/L Alcohol) ≥ 5
✅ Slope (α): ≤ 0.6 (R300ppm / R100ppm Alcohol)
✅ Temperature & Humidity: 20°C ± 2°C; 65% ± 5% RH
✅ Standard Test Circuit: Vc: 5.0V ± 0.1V; VH: 5.0V ± 0.1V
✅ Preheat Time: Over 48 hours