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Description:
The gas sensing material used in the MQ-4 gas sensor is two tin oxide (SnO2), which has a lower conductivity in clean air. The electrical conductivity of the sensor increases with the increase of the concentration of combustible gas in the air when the sensor is in the presence of combustible gas. A simple circuit is used to convert the change of electrical conductivity to the output signal corresponding to the gas concentration.
The sensitivity of MQ-4 gas sensor to methane is high, and it has a better sensitivity for propane and. This sensor can detect a variety of combustible gases, especially natural gas, is a suitable for a wide range of applications of low-cost sensors.
characteristic
* good sensitivity to combustible gas in a wide range of concentration.
* the sensitivity of methane is higher.
* long life, low cost
* simple drive circuit
Application
* household gas leak alarm
* Combustible gas alarm for industrial use
* portable gas detector
Product model
MQ-4
product type
Semiconductor gas sensor
Standard package
Bakelite
Gas detection
Natural gas, methane
Detection concentration
300-10000ppm (methane, natural gas)
Standard circuit conditions
Loop voltage
Vc
DC = 24V
Heating voltage
VH
5.0V + ACorDC 0.2V
Load resistance
RL
Adjustable
Characteristics of gas sensors under standard test conditions
Heating resistance
RH
31 + 3 (Shi Wen)
Heating power consumption
PH
Less than 900mW
Sensitive surface resistance
Rs
2K -20K (in CH4) (5000ppm)
sensitivity
S
Rs (in air) /Rs (5000ppm methane) = 5
Concentration slope
Alpha
Less than 0.6 (R5000ppm/R3000ppmCH4)
Standard test conditions
Temperature and humidity
20 C + 2 C; 65% + 5%RH
Standard test circuit
Vc:5.0V + 0.1V;
5.0V VH: + 0.1V
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