Products
CH4 Gas Sensor
Application:
1. Combustible gas leak monitoring devices and fire/safety detection systems for households, factories, and commercial useProduct characteristics:
1.Has 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
Technical 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 | |
Test Circuit
Description: The figure above is the basic test circuit of the MQ-D4B sensor. The sensor needs to apply 2 voltages: heater voltage (VH) and test voltage (VC). VH is used to provide a specific operating temperature for the sensor, and can be powered by a DC power supply or an AC power supply. VRL is the voltage on the load resistor (RL) connected in series with the sensor. VC is the voltage provided for the test of the load resistor RL, and a DC power supply must be used.
TenSensor, China's first listed gas sensor company,Tensensor can provide more than 100 varieties of six series including：
semiconductor gas sensor
electrochemical gas sensor
infrared gas sensor
dust sensor
pyroelectric sensor
thermopile sensor, etc.
which can be used for more than 200 kinds of gas and infrared, dust and other indicators detection, widely used in the field of security for detecting gas leakage, noxious gas leakage, smog and fire, the field of family, office and factory for detecting HCHO, VOC, CO2, PM2.5 and so on.
Moreover, the solutions for security, household electrical appliances, consumer electronics, smart home, instruments and meters are available.
For more information about MQ-D4B sensor, please contact account manager.
TEL：0086-0351-5249552
Whatsapp：+86 18335818384
Email：[email protected]
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