Target: CO2
Model: MH-Z19D
Detection range: 400~10000ppm optional
Detection principle: non-dispersive infrared (NDIR) principle
Characteristics: 1, High sensitivity, low power consumption; 2, Good stability; 3. Temperature compensation, excellent linear output; 4. Multiple output modes: UART, PWM; 5.RESET compliant
Size: 32.9x19.7x8.6mm (LxWxH)
Working conditions: DC(5.0±0.1)V
Measurement range: 400~2000 ppm
400~5000 ppm
Resolution and accuracy: 1ppm±(50ppm+5% reading value)
Response time: T90<120s

MH-Z19D Manual download
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MH-Z19D NDIR infrared gas module is a common type, small size sensor, pins type or terminal type, 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. 


  • Smart home
  • Air cleaner device
  • Indoor air quality monitoring
  • Ventilation system


  • High sensitivity
  • Low power consumption
  • Good stability
  • Temperature compensation, excellent linear output
  • Multiple output modes: UART, PWM
  • Long life span
  • Anti-water vapor interference, anti-poison 


 Model No. MH-Z19D
Detection gas CO2
Working Voltage 5.0±0.1V DC
Average Current <40mA (@5V power supply)
Peak Current 125mA (@5V power supply)
Interface Level 3.3V (Compatible with 5V)
Detection range 400~10000ppm (optional, see table 2.)
Output Signal Serial Port (UART) (TTL level 3.3V)
Preheat Time 1 min
Response Time T90 <120s
Working Temperature 0 ~ 50℃
Working Humidity 0 ~95% RH (No condensation)
Storage Temperature -20~60 ℃
Weight 5g
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.