Products
CH4 Gas Sensor
Application:
1. Combustible gas leak monitoring devices and fire/safety detection systems for households, factories, and commercial useProduct characteristics:
Good sensitivity to methane over a wide concentration rangeDescription
The MQ-D4B combustible gas sensor adopts a multi-layer film manufacturing process, in which heaters and metal oxide semiconductor gas sensing layers are respectively fabricated on both sides of a micro AL2O3 ceramic substrate, and encapsulated in a metal shell. When there is a detected gas in the ambient air, the conductivity of the sensor changes. The higher the concentration of the gas, the higher the conductivity of the sensor. A simple circuit can be used to convert this change in conductivity into an output signal corresponding to the gas concentration.
Specifications
| Product model | MQ-D4B | |
| Product type | Flat semiconductor sensor | |
| Standard packaging | Metal encapsulation | |
| Detection gas | Methane, natural gas, biogas | |
| Detect concentration | 300~10000ppm(Methane, natural gas) | |
| Standard circuit conditions | Heat voltage(DC) VH | 5.0V±0.1V AC or DC |
| Circuit voltage(Dc) Vc | ≤24V DC | |
| Load resistance RL | adjustable | |
| Concentration slope α | Heating resistor RH | 85Ω±15Ω(indoor temperature) |
| Heating power PH | ≤350mW | |
| Sensitive body resistance Rs | 1KΩ～20KΩ(in 5000ppm methane) | |
| Sensitivity S | Rs(in air)/Rs(in 5000ppm methane)≥5 | |
| Concentration slope α | ≤0.6(R5000ppm/R1000ppm methane) | |
| Standard testing conditions | Temperature/humidity | 20℃土2℃; 55%士5%RH |
| Standard Test Circuit | VC: 5V±0.1V; VH: 5V±0.1V | |
| Oxygen concentration | 21% (not less than 18%) (Oxygen concentration will affect the initial value, sensitivity, and repeatability of the sensor. Please consult for use when using at low oxygen concentrations) | |
| Warm-up time | no less than 48 hours | |
| Life | 10 years | |
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