YJJ MH-Z19 Series Carbon Dioxide Sensor Module HVAC Fresh Air Intelligent Home Carbon Dioxide Detection Module

Product Description:

YJJ MH-Z19 Series Carbon Dioxide Sensor Module HVAC Fresh Air Intelligent Home Carbon Dioxide Detection Module

Features:

MH-Z19 Series NDIR Infrared Carbon Dioxide Sensor Module

Parameter Description
Principle: **NDIR Non-Dispersive Infrared**, using infrared absorption to detect CO2, with built-in temperature compensation, resistant to water vapor interference, and less prone to poisoning; mainstream models MH-Z19B / MH-Z19C / MH-Z19E, widely used in indoor air quality, HVAC, and gas analyzers

General Core Parameters

- Detected Gas: CO2 Carbon Dioxide
- Power Supply: DC 5V (MH-Z19B: 4.5~5.5V; MH-Z19C/E: 5.0±0.1V)
- Peak Current: 125~150mA@5V
- Interface Level: 3.3V TTL, compatible with 5V microcontrollers
- Output Signal: **UART Serial Port + PWM** (some versions have analog voltage output)
- Optional Range: 0~2000 / 0~5000 / 0~10000 ppm
- Measurement Accuracy: ±(50ppm + 5% reading); Resolution 1ppm
- Humidity: 0~95% RH, **no condensation**
- Lifespan: >10 Years
- Automatic Calibration: Built-in ABC Automatic Baseline Calibration Function

Model Differences

1. **MH-Z19B**
- Sampling period: 5 seconds; Preheating 3 minutes
- Operating temperature: 0 - 50℃
2. **MH-Z19C (upgraded version, most commonly used on the market)**
- Sampling period: 1 second, faster response; Preheating 2.5 minutes
- Operating temperature: -10 - 50℃, better performance at low temperatures
- Single gas chamber, higher consistency than model B, can be directly replaced with MH-Z19B via pins
3. **MH-Z19E**
- Preheating only takes 1 minute, resulting in a faster startup speed.
- Working temperature: -10 to 50 degrees Celsius.

Product features

1. NDIR infrared principle, with excellent long-term stability, and will not fail due to poisoning like electrochemical sensors.
2. Built-in temperature compensation, reducing temperature drift.
3. ABC automatic baseline calibration, allowing for long-term use without the need for frequent manual calibration.
4. Dual output UART + PWM, facilitating embedded development.
5. Compact in size, weighing only 5g, making it easy to integrate into various devices.

Typical application

1. Indoor air quality monitoring, fresh air system, HVAC (Heating, Ventilation, and Air Conditioning)
2. Air purifiers, smart home devices, CO2 monitoring in classrooms/greenhouses
3. Portable gas analyzers, CO2 detection for flue gas analyzers
4. Cold chain, greenhouse cultivation, livestock environment monitoring

Specifications: