MH-Z19C NDIR CO2 Sensor for HVAC and IAQ

  • • Target gas: Carbon Dioxide, CO2
  • • Range: CO2(400-2000ppm/400-5000ppm/400-10000ppm)
  • • Application: HVAC, building ventilation system, indoor air quality monitoring system

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  • Principle Introduction
Principle Introduction:
MH-Z19C NDIR infrared gas module is a common type, small size sensor, 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. MH-Z19C is affordable for RESET standard.
Applications :
 MH-Z19C NDIR infrared gas module is widely used in
*HVAC refrigeration
*HVAC control panel/Thermostat
*Indoor air quality monitoring.
*Smart home appliances
*Air purification equipment
*CO2 detector/Monitor

Technical parameters :

Tips:For more parameter information, please refer to the latest manual provided by salesman.

 Model No.


Detection Gas


Working voltage

5.0±0.1V DC

Average current

< 40mA (@5V power supply)

Peak current

125mA (@5V power supply)

Interface level

3.3 V (Compatible with 5V)

Detection Range


Output signal

Serial Port (UART) (TTL level 3.3V)


Preheat time

1 min

Response Time

T90 < 120 s

Working temperature

-10 ~ 50

Working humidity

0 ~ 95% RH (No condensation)

Storage temperature



5 g


> 10 years

Reference Circuit :

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