This is a simple-to-use Carbon Monoxide (CO) sensor, suitable for sensing CO concentrations in the air. The MQ-7 can detect CO-gas concentrations anywhere from 20 to 2000ppm.

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

• Heater Voltage: 5 ±0.2V（AC or DC）
• Working current: 140mA
• Loop Voltage: 10V(≤15V DC)
• Load Resistance: 10K(Adjustable)
• Concentration: 10-2000ppm
• Sensitivity: ≥ 3%
• Response Time: ≤ 1S(Heater Time 3-5min)
• Recovery Time: ≤ 30S
• Power Consumption: ≤ 0.7W
• Working temperature: -10~50℃
• Working humidity: 95%RH
• Size: 35mm×22mm×18mm (L×W×H)