MQ8 Gas Sensor

The MQ8 Gas Sensor is a semiconductor gas sensor designed primarily for detecting hydrogen (H₂) gas. It uses a tin dioxide (SnO₂) sensing material whose conductivity changes when hydrogen is present. The sensor is suitable for gas leakage detection, safety monitoring and hydrogen sensing projects.

Technical Specifications:

• Sensor Type: Semiconductor Gas Sensor
• Target Gas: Hydrogen (H₂)
• Detection Range: 100–1000 ppm H₂
• Heater Voltage: 5.0V ±0.1V AC or DC
• Loop Voltage: Up to 24V DC
• Heater Resistance: Approximately 29Ω ±3Ω at room temperature
• Heater Consumption: ≤900mW
• Load Resistance: Adjustable
• Preheat Time: More than 48 hours

Features:

• High sensitivity to hydrogen gas
• Wide hydrogen detection range
• Simple drive and interfacing circuit
• Durable metal-cap construction
• Long operating life
• Suitable for continuous gas monitoring
• Compact through-hole design for PCB mounting

Applications:

• Hydrogen gas leakage alarms
• Industrial flammable gas detection
• Domestic gas safety systems
• Portable gas detectors
• Hydrogen monitoring systems
• Safety and alarm projects
• Microcontroller-based gas detection systems