Frequently bought together:
Description
Features:
| CATEGORY | SPECIFICATIONS |
|---|---|
| Product Type | Combustible Gas Sensor Module |
| Model / Sensor Type | MQ-4 (SnO₂ gas sensing element) |
| Detection Gases | Methane (CH₄), Natural gas, LPG, Propane |
| Detection Range | 300 – 10,000 ppm |
| Operating Principle | Tin dioxide (SnO₂) conductivity increases when combustible gas is present |
| Operating Voltage | DC 5 V |
| Power Consumption | ~150 mA (heater powered) |
| Output Types | Analog (AO) + Digital (DO / TTL) |
| Digital Output (DO) | TTL signal (LOW when gas detected, HIGH otherwise) |
| Analog Output (AO) | 0.1–0.3 V baseline, up to ~4 V at high gas concentration |
| Sensitivity | High sensitivity to methane and propane |
| Selectivity | Good balance between methane and propane detection |
| Interference Resistance | Resistant to alcohol and smoke interference |
| Response Characteristics | Fast response and recovery |
| Warm-up Time | ~20 seconds (heater stabilization required) |
| Operating Principle | Gas concentration ↑ → sensor conductivity ↑ → output signal changes |
| Physical Size | 32 mm × 20 mm × 22 mm |
| Mounting Features | 4 screw holes for installation |
| Indicator System | Power LED + digital signal LED |
| Stability | Long service life, stable operation |
| Internal Components | SnO₂ sensing layer + heating coil + signal conditioning circuit |
| Controller Reference Chip | AT89S52 (module-level reference) |
| Communication Mentioned | UART 9600 (system-level integration reference) |
| Applications | Gas leak detection, home safety systems, industrial methane monitoring, LPG alarms, ventilation systems |
Package Includes:
1 x MQ-4 Gas Sensor Module
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