Target: CO,CH4
Model: MP-9
Detection range: 50-1000ppm(CO),300-10000ppm(CH4)
Detection principle: Semiconductor
Characteristics: High sensitivity to CO、CH4
Size: φ9.4×7.5
Working conditions: Loop Voltage:≤10V High temp.heater voltage:5±0.1V Low temp.heater voltage:1.5±0.1V Heater consumption:≤240mW

MP-9 Manual download
Get Price Whatsapp


MP-9 model with advanced planar construction is comprised of heater and metal oxide semiconductor material of subminiature Al2O3 ceramic plate, fetch out electrode down-lead, encapsulation in metal base and cap. It detects carbon monoxide (1.5V) by method of cycle high and low temperature. At high temperature (5.0V), it can detect CO as well as clean the other gases adsorbed at low temperature. The sensor’s conductivity gets higher along with the CO and CH4 gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.


Domestic CO leakage alarm, industrial CO gas alarm and portable CO detector.


  • High sensitivity to CO,CH4 in wide range
  • Small sizes, Long lifespan, Low cost, Simple circuit


Model MP-9
Sensor Type Flat Surfaced Semiconductor
Standard Encapsulation Metal Cap
Target Gas CO, CH4
Detection range 50~1000ppm CO,300~10000ppm CH4
Standard Circuit Conditions Loop Voltage Vc ≤10V DC
Heater Voltage VH 5.0V±0.1V AC or DC (High temp.) 1.5V±0.1V AC or DC (Low temp.)
Heating Time TL 60S±1S (High temp.) 90S±1S (Low temp.)
Load Resistance RL Adjustable
Sensor character under standard test conditions Heater Resistance RH 105Ω±10Ω (room tem.)
Heater consumption PH ≤240mW
Sensitivity S Rs(in air)/Rs(in 100ppm CO)≥3 Rs(in air)/Rs(in 5000ppm  CH4)≥3
Output voltage Vs 2.5V ~ 4.3V (in 100ppm CO) 2.0V ~ 4.0V (in 5000ppm  CH4)
Concentration Slope α ≤0.6(R300ppm/R50ppmCO) ≤0.6(R5000ppm/R1000ppm CH4)
Environment Conditions Operation Temp. Tao -10℃~50℃
Storage Temp. Tas -20℃~70℃
Relative Humidity RH Less than 95%RH
O2 concentration O2 21%±1%(can’t be less than 18%) O2 concentration effects sensor’s performance.
Preheat time Not less than 48 hours

* 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.