Target: CO2(Carbon dioxide)
Model: MH-Z1911A
Detection range: 400~10000ppm optional
Detection principle: non-dispersive infrared (NDIR) principle
Characteristics: High sensitivity, low power consumption; Temperature compensation, excellent linear output; Multiple output modes: UART, PWM
Size: 32.9x19.7x8.6mm (LxWxH)
Working conditions: DC(5.0±0.1)V
Notes: RESET compliant

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MH-Z1911A infrared CO2 sensor is intelligent sensor with small size, using non-dispersive infrared (NDIR) principle to detect the concentration of CO2 in the air of buildings such as office, home, classroom, airport installed in air quality meters, air purifier and HVAC system. It has excellent selectivity carbon dioxide, built-in temperature compensation for high accuracy, lower power consumption and optional output ways of UART and PWM. It is developed by the tight integration of mature infrared absorbing gas detection technology, precision optical circuit design and superior circuit design.


  • HVAC system
  • Air purifier
  • Air quality monitor
  • Consumer CO2 meter
  • Smart home device
  • Smart building automation
  • Indoor environmental control


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


Model No. MH-Z1911A Preheat time 1 min
Detection Gas CO2 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) Weight 5 g
Output signal Serial Port (UART)(TTL level 3.3V) Detection Range 400~10000ppm(optional,see table2.)
PWM 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.