This is very simple to use, suitable for sensing natural gas (composed of mostly Methane [CH4]) concentrations in the air. The MQ-4 can detect natural gas concentrations anywhere from 200 to 10000ppm.
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.
- Characteristics of gas: 5000 PPMM methane
- Sensitivity: R in air/Rin typical gas >=5
- Sensitive resistance: 1k ohm to 20k ohm in 5000 PPM methane
- Response time: <=10s
- Recovery time: <=30s
- Heat resistance: 31ohm +/- 3ohm
- The heating current: <=180mA
- The heating voltage: 5.0V +/- 0.2V
- Heating power: <=900mW
- Measure the voltage: <=24V
- Working conditions:
- Ambient temperature: -20℃ ~ + 55℃
- Humidity: <=95%RH
- Storage conditions:
- Temperature: -20℃~ +70℃
- Humidity: <=70%RH