Target: CH4
Model: MH-L9043A
Detection range: 3~20%LEL
Detection principle: Laser spectral absorption
Characteristics: Good consistency, Fast response, High precision, Long life
Size: 66mm*19mm*15.8mm
Resolution and accuracy: ±3%LEL

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MH-L9043A laser methane sensor module adopts laser spectral absorption detection technology, the sensor has stable and reliable performance and long service life. The module has the characteristics of strong corrosion resistance, high precision, fast response, low power consumption and can be used in the home kitchen environment.
The module adopts TTL data communication interface, the data is stable without zero drift, and the product is free of calibration and maintenance, which is convenient for customers to integrate and engineering application.


  • Methane gas alarm for home use


  • Good consistency, Fast response, High precision, Long life
  • Good water vapor resistance, Good anti-interference performance


Model No. MH-L9043A
Working principle Laser
Detection Gas CH4
Detection Range 3~20%LEL
Detection Accuracy ±3%LEL
Repeatability 2% (test conditions:warm-up time is 15s, 20.00%LEL CH4 standard gas, testing time is 1min)
Resolution 0.5%LEL
Response time ≤ 15s(cold boot)
Working Voltage DC (3.6~5)V
Average Current ≤ 60 mA @25℃
Working conditions -20~60℃ 0-99%RH(no condensation)  80~116kpa
Storage conditions -40~85℃ 0-95%RH(no condensation) 
Output UART (TTL 3.3V)
Size 66mm*19mm*15.8mm
Weight About 15g
Life ≥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.