Winsen MH-Z19B NDIR CO2 sensor for indoor air quality monitoring


In stock

SKU: 1278805
  1. Model No: MH-Z19B
  2. Detection Gas: CO2
  3. Working voltage: 4.5 ~ 5.5 V DC
  4. Target gas: Carbon Dioxide
  5. Range: CO2(400-2000ppm/400-5000ppm)
  6. Application: HVAC, building ventilation system, indoor air quality monitoring system


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Brand: Winsen
Category: Gas and Dust Sensor

MH-Z19B 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.


  1. HVAC refrigeration
  2. Air cleaner device
  3. Indoor air quality monitoring
  4. Smart home
  5. Ventilation system
  6. School


  1. Chamber is gold plated, water-proof and anti-corrosion
  2. High sensitivity, low power consumption
  3. Good stability
  4. Temperature compensation, excellent linear output
  5. Multiple output modes: UART, PWM
  6. Long lifespan
  7. Anti-water vapor interference, anti-poisoning

Package Includes: 

1 x Winsen MH-Z19B NDIR CO2

SKU: 1278805 Category:
Model No


Detection Gas


Working voltage

4.5 ~ 5.5 V DC

Average current

< 20mA (@5V power supply)

Peak current

150mA (@5V power supply)

Interface level

3.3 V (Compatible with 5V)

Detection Range


Output signal

Serial Port (UART) (TTL level 3.3V), PWM

Preheat time

3 min

Response Time

T90 < 120 s

Working temperature

-10 ~ 50 ℃

Working humidity

0 ~ 95% RH (No condensation)


5 g


> 5 years

Shipment Weight

0.006 kg

Shipment Dimensions

7 × 6 × 2 cm

15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects.  Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China