Winsen MH-Z19C NDIR CO2 Sensor for HVAC and IAQ

(2 customer reviews)

In stock

SKU: 938346
  1. Working voltage: 5.0±0.1V DC
  2. Detection Gas: CO2
  3. Output signal: UART(TTL interface level 3.3V), PWM
  4. Range: CO2(400-2000ppm/400-5000ppm)
  5. Gold-plated Chamber


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Brand: Winsen
Category: Gas and Dust Sensor
Tags: Gas Sensor, MH-Z19Z19C NDIR CO2 Sensor

Winsen MH-Z19Z19C NDIR CO2 Sensor 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.


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


  1. Chamber is Gold-plated
  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-Z19C NDIR CO2 Sensor for HVAC and IAQ


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

UART (TTL level 3.3V), PWM

Preheat Time

1 min

Response Time

T90 < 120 s

Length (mm)


Width (mm)


Height (mm)


Weight (gm)


Shipment Weight

0.02 kg

Shipment Dimensions

3 × 2 × 1 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.

Based on 2 reviews

5.0 overall

Add a review

  1. vishnumaiea (verified owner)

    Works as expected. Readings are accurate and output can be read as soon as it starts.


  2. manoharagent13 (verified owner)

    Great sensor, works as advertised. Tested with ESP32 and Raspberry pi 4B.


User Manual

Questions and answers of the customers

  1. 0 votes

    It is for 5000 ppm.

Only registered users are eligible to enter questions
Country Of Origin: China