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Description
Features:
| CATEGORY | SPECIFICATIONS |
|---|---|
| Product Type | Carbon Monoxide (CO) & Combustible Gas Sensor Module |
| Model / Sensor Type | MQ-9 (SnO₂ gas sensing element) |
| Detection Gases | Carbon Monoxide (CO), Methane (CH₄), LPG, Propane |
| Detection Range (CO) | 10 – 1000 ppm |
| Detection Range (Combustible Gas) | 100 – 10,000 ppm |
| Operating Principle | Tin dioxide (SnO₂) conductivity varies with gas concentration |
| Heating Method | Dual-temperature cycling (low temp for CO, high temp for combustible gases) |
| Operating Voltage | DC 5 V |
| Power Consumption | ~150 mA (heater required) |
| 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 concentration |
| Signal Behavior | Gas concentration ↑ → output voltage ↑ |
| Sensitivity | High sensitivity to carbon monoxide and combustible gases |
| Selectivity | Designed for CO detection with additional flammable gas detection capability |
| Response Characteristics | Fast response and recovery |
| Warm-up Time | ~20 seconds (required for stable readings) |
| Indicator System | Power LED + digital output indicator LED |
| Physical Size | 32 mm × 20 mm × 22 mm |
| Mounting Features | 4 screw holes for easy installation |
| Stability | Long service life and reliable operation |
| Special Features | Dual detection modes (CO + combustible gases), dual output (AO + DO) |
| Applications | Carbon monoxide detectors, gas leak alarms, industrial safety systems, home safety monitoring |
Package Includes:
1 x MQ-9 Liquefied Methane Gas Sensor
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