Infrared Carbon Dioxide(CO2) Sensor MH-Z1911A

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MH-Z1911A infrared CO2 sensor is intelligent sensor as shown in Figure 1,common type, small size, using non-dispersive infrared (NDIR) principle to detect the existence of CO2 in the air, with good selectivity, non-oxygen dependent and long life. Built-in temperature compensation, and it has UART output and PWM output. It is developed by the tight integration of mature infrared absorbing gas detection technology, precision optical circuit design and superior circuit design.

*HVAC refrigeration             *Air cleaner device
*Indoor air quality monitoring     *Smart home
*Ventilation system


* High sensitivity, low power consumption
* Good stability
* Temperature compensation, excellent linear output
* Multiple output modes: UART, PWM
* Long lifespan
* Anti-water vapor interference, anti-poisoning

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Cleaning Appliance

Cleaning appliances such as washing machines and sweeping robots in the lazy economy have fast product upgrade and functional integration has become the general trend. The addition of Winsen technology dust sensors, VOC sensors, temperature sensors etc., brings more possibilities for the performance upgrade of product function innovation.


CO2 Detector

Most people spend about 90% of their time indoors. The air we breathe indoors and our health are affected by many factors, including outdoor air quality, the movements of people indoors, and the design, construction, operation and maintenance of buildings.



Winsen Technology has provided accurate gas detection solutions for more than 1,000 fresh air enterprises, which has also established the influence of Winsen sensors in the air purification market. In the future, Winsen will launch more intelligent and miniaturized all-in-one integrated modules to meet the various needs of different customers in the ventilation system market.


Air Quality Monitoring in Public Places

Outdoor air quality monitoring is a process of measuring the concentration of pollutants in the atmospheric environment, observing and analyzing their changes and their impact on the environment. Air pollution monitoring is to measure the types and concentrations of pollutants in the atmosphere, and observe their spatial distribution and changing rules.


Air Quality Monitor

Air pollution is becoming more and more serious. The value of PM2.5 (referring to particulate matter with aerodynamic equivalent diameter less than or equal to 2.5 microns in ambient air) is a parameter index.


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Specification Product Size

Technical Data Sheet

Model No.


Preheat time

1 min

Detection Gas


Response Time

T90 <120s

Working voltage

DC 5.0±0.1V

Working temperature

-10 ~ 50 ℃

Average current

< 30mA (@5V power supply)

Working humidity

0~95%RH(No condensation)

Peak current

125mA (@5V power supply)

Storage temperature

-20~60 ℃

Interface level

3.3 V (Compatible with 5V)



Output signal

Serial Port (UART) (TTL level 3.3V)

Detection Range

400~10000ppm(optional,see table2.)



> 10 years


Detection Gas


Detection Range



Carbon Dioxide




± (50ppm+5% reading value)






Free Guide! Learn the Parameter Differences of Similar Sensors

Wondering how to find the most suitable one for you out of so many sensors? Download our free guide to learn the comparison table of technical parameters. 



As a pioneer in gas sensor based solutions with the advanced processes, technologies and products, Winsen offers a wide range of gas sensors:


As a pioneer in gas sensor based solutions with the advanced processes, technologies and products, Winsen offers a wide range of gas sensors:


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How to choose the right sensor for your project?

We have 17 sensor series, 200+ categories, and 300+ detection objects for gas detection. Such as CO, CO2, VOC, PM2.5, CH4, LPG and so on. In particular, we also have MEMS sensors. According to your industry application, gas principle, power consumption, accuracy, and range requirements, and we can select a specific model for you. You can also use the product filter below to choose a suitable product, or choose online serivce.

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Here you can learn about the selection guide, common technical problems, packaging, transportation, MOQ, delivery time, etc.

What is your warranty term?

The warranty period is one year from the date of shipment. If the appearance of the product is not damaged, it can be returned after confirmation. For damage not caused by Winsen, the customer shall bear all maintenance costs.

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If there is any problem in the process of testing and use, you can contact us by email, hotline, technical consultation etc, we will do our best to solve your problem.

What is your pre-sales service?

We can recommend sensors based on the target gas and the industrial application to help you quickly select the most suitable one. Sensor Module is also available to save your design time and cost.

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