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Description
Features:
| CATEGORY | SPECIFICATIONS |
|---|---|
| Product Type | Alcohol / Ethanol Gas Sensor Module |
| Model / Sensor Type | MQ-3 (ZYMQ-3 sensing element) |
| Detection Gas | Ethanol (Alcohol vapor) |
| Operating Principle | Tin dioxide (SnO₂) conductivity increases with alcohol concentration |
| 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 alcohol detected, HIGH otherwise) |
| Analog Output (AO) | 0 – 5 V (proportional to alcohol concentration) |
| Signal Behavior | Alcohol concentration ↑ → output voltage ↑ |
| Comparator Chip | LM393 |
| Sensitivity | High sensitivity to ethanol |
| Selectivity | Good selectivity for alcohol vs other gases |
| Response Characteristics | Fast response and quick recovery |
| Warm-up Time | ~20 seconds (required for stable readings) |
| Indicator System | Power LED + digital output indicator LED |
| Physical Size | 32 mm × 22 mm × 27 mm |
| Mounting Features | 4 screw holes for easy installation |
| Stability | Long service life and reliable performance |
| Special Features | Dual output, threshold detection via comparator |
| Applications | Breath alcohol testers, drunk driving detection systems, industrial ethanol monitoring, safety systems |
Package Includes:
1 x MQ-3 Alcohol Ethanol Sensor
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