MQ-7 CO Carbon Monoxide Coal Gas Sensor Module

Description

• A carbon monoxide (CO) detector for the Arduino-based DIY security system. The carbon monoxide detector is a semiconductor gas sensor tuned to detect carbon monoxide. It is in the same family of devices as the smoke detector sensor, measuring the change in surface conductivity of tin dioxide in the presence of carbon monoxide.
  This sensor has a high sensitivity and fast response time. The sensor’s output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.
  Features :
  • Mainly used for CO collection detection in family, factory, underground operation.
  • Detection Zone:10 to 1000ppmm.
  • Characteristic Gas:100ppmm co.
  • Sensitive Resistance:2K to 20K in 100ppm co.
  • Sensitivity:>=3%.
  • Response Time:<=1s.
  • Recovery Time:<=30s.
  • Heating Resistance:31±3.
  • Heating Current:<=180mA.
  • Heating Voltage:5.0V±0.2V /1.5±0.1V.
  • Heating Power: about 350mW.
  • Conditions:Ambient Temperature:-20C~+50C.
  • Humidity:<=95%RH.
  • Oxygen Content:21% .
  • Size: 3.5cm X 2.2cm