Hot selling MQ-7 module carbon monoxide gas sensor detection alarm module quality online_Various types Modules

Hot selling MQ-7 module carbon monoxide gas sensor detection alarm module quality online

Product Feature:

The gas sensing material used in MQ-7 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. Using a high-low temperature cycle detection method to detect carbon monoxide at low temperatures (1.5V heating), the conductivity of the sensor increases with the concentration of carbon monoxide gas in the air. High temperature (5.0V heating) is used to clean the stray gases adsorbed at low temperatures. The change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit. The MQ-7 gas sensor has high sensitivity to carbon monoxide and can detect various gases containing carbon monoxide. It is a low-cost sensor suitable for multiple applications

Technical parameter

1、Heating voltage: 5 ± 0.2V (AC · DC)

2、Working current: 140mA

3、Circuit voltage: 10V (DC 15V)

4、Load resistance: 10K (adjustable)

5、Detection concentration range: 10-1000ppm

6、Voltage in clean air: ≤ 1.5V

7、Sensitivity: ≥ 300

8、Response time: ≤ 1S (preheating for 3-5 minutes)

9、Response time: ≤ 30 seconds

10、Component power consumption: ≤ 0.7W

11、Working temperature: -10~50 ℃ (nominal temperature 20 ℃)