Target: Combustible gases such as domestic natural gas,LPG,coal gas,CH4,C3H8 and so on
Model: MC227D
Detection range: 0-100%LEL
Detection principle: catalytic combustion
Characteristics: Bridge output voltage in linear, fast response, good repeatability and selectivity
Size: φ12.4×10.3
Working conditions: Working voltage:2.5±0.1V
Working current:150±10mA

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MC227D adopts catalytic combustion principle, and its two arms of electric bridge consists of a test element and a compensate element. The resistance of the test element rises once it meets the combustible gases, in the same time, the output voltage of the bridge changes and the voltage variation rises in direct proportion to the gas concentration. The compensate element, as a conference, has the function of compensating temperature and humidity.


It is widely used in public places (not industrial occasion) to detect the concentration or leakage of combustible gases such as natural gas, LPG, coal gas.


  • Bridge output voltage in linear
  • Fast response
  • Good repeatability and selectivity
  • Good stability and reliability
  • Resist H2S poisoning & organosilicone.


Model MC227D
Sensor type Catalytic type
Standard encapsulation Plastic base & metal cap
Working voltage(V) 2.5±0.1
Working current (mA) 150±10
Sensitivity (mV) 20%LEL CH4 12~35
20%LEL C3H8 10~30
Linearity ≤5%
Measuring range (%LEL) 0~100
Response time (90%) ≤10s
Recovery time (90%) ≤30s
Working environment -40~+70℃ <95%RH
Storage environment -20~+70℃ <95%RH
Life span 5 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.