The MQ-2 gas sensor detects hydrogen (H₂), LPG, propane, methane, smoke, and flammable gases with high sensitivity. Ideal for safety systems, leak detectors, and air quality monitors, it provides dual analog/digital outputs for quantitative measurement and threshold alerts.
Technical Specifications
Core Specifications
Target Gases: Hydrogen (H₂), LPG, Propane, CH₄, Smoke
Detection Range: 300–10,000 ppm (H₂/LPG)
Operating Voltage: 5V ±0.1V
Output Signals:
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- Analog (0–5V): Gas concentration
- Digital (TTL): Threshold trigger
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Response Time: <10s
Electrical & Physical
Heater Current: 150mA (preheat required)
Sensitivity Adjustment: Onboard potentiometer
Sensor Type: Metal Oxide Semiconductor (SnO₂)
Dimensions: 35mm × 20mm × 22mm
Interface: 4-pin (VCC, GND, AO, DO)
Environmental
Operating Temp.: -10°C to 50°C
Preheat Time: ≥24h (initial calibration)
Why Choose the MQ-2?
✔ Multi-Gas Detection – Single sensor for H₂/LPG/smoke
✔ Early Warning System – Triggers alarms before explosive levels
✔ Arduino-Compatible – Libraries available
Critical Uses:
Kitchen gas leak alarms
Industrial H₂ safety monitors
Fire detection systems
DIY air quality stations
Pro Tips:
Calibrate in clean air before use.
Avoid continuous operation >48h to extend lifespan.
Combine with ventilation controls for automatic shutoff.
Package Includes:
1 × MQ-2 Gas Sensor Module