MQ7 is a  Carbon Monoxide (CO) sensor, suitable for sensing Carbon Monoxide concentrations(PPM) in the air. MQ7 Gas sensor can measure CO concentrations ranging from 20 to 2000 ppm. This sensor has a high sensitivity and fast response time. The sensor's output is an analog resistance.This sensor comes in a package similar to MQ3 alcohol sensor. MQ7 gas sensor has high sensitivity to Carbon Monoxide. The sensor could be used to detect different gases contains CO, it is with low cost and suitable for different application. They are used in gas detecting equipment for carbon monoxide(CO) in family and industry or car. 

Features of MQ7 CO Gas Sensor:- 

• High sensitivity to carbon monoxide
  
• Stable, long life and low cost
  
• Good sensitivity to Combustible gas in wide range
  
• High sensitivity to Natural gas
  
• Simple drive circuit
  

Applications of MQ7 CO Gas Sensor:-

• Domestic gas leakage detector
  
• Industrial CO detector
  
• Portable gas detector