MQ-7 Carbon Monoxide Sensor

This Gas Sensor detects carbon monoxide concentrations in the air. An analog signal increases as the concentration of carbon monoxide gas increases in the air. This module also includes a digital output pin with TTL output. The Potentiometer on board is used to set the Digital Output Setpoint. 

Specifications:

• Wide detecting scope
• High sensitivity & stability
• Simple drive circuit
• Type: MQ-7
• Detection Zone: 10 - 1000ppm
• Sensitivity: ≥3%
• Voltage in Clean Air: ≤1.5V
• Load Resistance:10K (variable via onboard potentiometer)
• Response Time:≤1s (pre-heating 3-5 minutes)
• Recovery Time:≤30s
• Heating Current:≤140mA
• Heating Voltage:5.0V±0.2V
• Heating Power: ≤700mW
• Maximum Voltage:≤15V
• Operating Conditions:
  • Ambient Temperature:-10℃～+50℃
  • Humidity:≤95%RH
• Life expectancy: 5 years
• Operating Voltage: 5V
• Compatible with Arduino & Raspberry Pi
• Pinout:
  • VCC: 5V
  • AOUT: Analog Output
  • DOUT: Digital Output
  • GND: 0V