Target: CH4, Methane, Natural gas, marsh gas
Model: MPn-4C
Detection range: 300~10000ppm (methane, natural gas)
Detection principle: Semiconductor
Characteristics: High sensitivity to CH4 gas, Excellent anti-interference ability

MPn-4C Manual download
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MPn-4C adopts a multi-layer thick film manufacturing process, which integrates a heating electrode, a measuring electrode and a metal oxide semiconductor gas sensitive layer on an Al2O3 ceramic substrate, and encapsulates it in a metal housing. When the detected gas is present in the ambient air, the conductivity of the sensor will change, and the higher the concentration of the gas, the higher the conductivity of the sensor. This change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit. The product has good anti-interference ability to common gases such as alcohol and acetic acid in the use scene.


It is widely used in combustible gas leak monitoring devices, fire/safety detection systems for home, factory and commercial use; Flammable gas leak alarm, gas leak detector, etc.


  • High sensitivity to CH4 gas
  • Excellent anti-interference ability
  • Excellent stability


Model MPn-4C
Sensor Type Flat surfaced
Standard Encapsulation Metal cap
Target Gas CH4, Nature gas,marsh gas
Detection range 300~10000ppm (methane, natural gas) 
Standard Circuit Conditions Loop Voltage Vc ≤24V DC
Heater Voltage VH 5V±0.1V AC or DC
Load Resistance RL Adjustable
Heater consumption PH ≤350mW
Sensitive resistance RS 1KΩ~20KΩ(in5000ppm CH4)
Sensitivity S Rs(in air)/Rs(5000ppm CH4)≥8
Concentration Slope α ≤0.6(R5000ppm/R1000ppm CH4)
Standard test conditions Temp.  Humidity 20℃±2℃;55%±5%RH
Standard test circuit Vc:5V±0.1V; VH: 5V±0.1V
Preheat time Not less than 48 hours
O2content 21% (not less than 18%) O2 concentration effects initial value, sensitivity and repeatability.
Lifespan 10 years

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.