Product Description:
YJJ MQ-4 MQ-4B Natural Gas Detection Sensor Combustible Gas Sensing Sensor
Features:
MQ-4 natural gas detection sensor
The gas-sensitive material used in the MQ-4 natural gas sensor (gas sensor) is tin dioxide (SnO2), which has a relatively low electrical conductivity in clean air. When there are flammable gases in the environment where the natural gas sensor is located, the electrical conductivity of the natural gas sensor increases with the increase of the concentration of flammable gases in the air. A simple circuit can be used to convert the change in electrical conductivity into an output signal corresponding to the concentration of the gas. The MQ-4 natural gas sensor has high sensitivity to methane and strong anti-interference ability against alcohol and some other interfering gases.
Main application
Household gas leakage alarm, industrial combustible gas alarm, portable gas detector
Product model MQ-4
Product type: Semiconductor gas sensor
Standard encapsulation bakelite and metal covers
Detect the gas methane
Detection concentration: 300-10,000 PPM (methane)
Standard circuit condition loop voltage Vc 5.0V±0.1V DC
Heating voltage VH: 5.0V±0.1V AC or DC
The load resistance RL is adjustable
The characteristics of the gas-sensitive element under standard test conditions: heating resistance RH 28Ω±3Ω (at room temperature)
The heating power consumption PH is ≤1W
Sensitivity
S Rs(in air)/Rs(in 5000 PPM methane)≥5
Output voltage Vs 2.5V - 4.0V (in 5000ppm CH4)
Concentration slope α ≤0.6(R5000ppm/R1000ppm CH4)
The standard test conditions are temperature and humidity: 20℃±2℃. 55%±5%RH
Standard test circuit Vc:5.0V±0.1V The VH: 5.0 V + / - 0.1 V
The preheating time should be no less than 48 hours
Oxygen content: 21%(not less than 18%). The oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor. Please consult for use when using in low oxygen concentration.
Lifespan: 10 years
Specifications:
| Detection gas concentration range | 300-10,000 PPM (methane) |
| Standard circuit condition loop voltage | Vc 5.0V±0.1V DC |
| Operating temperature | 0℃ to 40℃ |
| Operating temperature range | -100°C to +250°C |
