MQ2 smoke,methane,butane gas sensor

SENSOR CHARACTERISTICS:

Gas: smoke
detection range: 300 to 10000ppmm
characteristic gases: 1000ppmm isobutane
sensitivity: R in air / Rin typical gas ≥ 5
Sensing Resistance: 1KΩ to 20KΩ in 50ppm toluene
Response time: ≤ 10s
recovery time: ≤ 30s
heater resistance: 31Ω ± 3Ω
heating current: ≤ 180mA
heater voltage: 5.0V ± 0.2V
heating power: ≤ 900mW
measuring voltage: ≤ 24V
working conditions temperature: -20 ℃ ~ +55 ℃
Humidity: ≤ 95% RH
environment, the oxygen content: 21 %