Inglés 
The material sensitive to the MQ-4 gas sensor used in the conductivity of clean air is a lower tin dioxide (SnO2). When the sensor is present in the environment in which the combustible gas is located, the conductivity of the sensor increases with the concentration of combustible gases in the air. The use of a simple circuit can be converted to the change in the conductivity of the gas concentration with the corresponding output signal. MQ-4 methane gas sensor for high sensitivity, propane, butane and has good sensitivity. The sensor can detect a variety of flammable gases, especially natural gas, it is a low-cost sensor for a variety of applications.
For home or methane gas factory, natural gas and other monitoring devices to analyze natural gas, methane 300 to 10000ppm;
Module Features:
- Use of high quality double panel design, with power indicator and TTL signal output instructions;
- With a DC switching signal output (TTL) and an analog signal output AC;
- The valid TTL output signal is low. (When the low output signal light can be connected directly to the microcontroller or relay module)
- The analog output voltage, the higher the concentration, the higher the voltage.
- Methane, natural gas has a better detection sensitivity.
- There are four screw holes for easy positioning;
- Product Dimensions: 32 (L) * 20 (W) * 22 (H)
- With a long service life and reliable stability
- Quick response and recovery features
Electrical properties:
Input voltage: DC5V power (current): 150mA
DC output: digital TTL 0 and 1 (0.1 and 5V)
AC output: 0.1-0 .3 V (relatively clean), the highest voltage concentration around 4V
Special note: the sensor is on, it needs to be heated around 20S, the measured data is stabilized, the sensor fever is a normal phenomenon, due to the internal heating cable if the heat is not normal.
