Selectable CO2 Ranges
Available in 400–2000 ppm, 400–5000 ppm and 400–10,000 ppm versions.
MH-Z19D NDIR CO2 Sensor Module
The MH-Z19D is a compact NDIR CO2 module with selectable ranges from 400 to 10,000 ppm. Built-in temperature compensation, UART and PWM outputs and pin or terminal versions make it suitable for smart-home, air-cleaning and ventilation products.
BrandWinsen
Sensing PrincipleNDIR
Target GasCO2
Product TypeNDIR CO2 Sensor Module
CO2 Sensing for OEM Integration
Product Overview
A compact NDIR module for indoor carbon-dioxide monitoring with UART and PWM interfaces.
The MH-Z19D detects CO2 through non-dispersive infrared absorption, providing good selectivity and measurement independent of oxygen concentration.
Its integrated optical and electronic design supports simple OEM integration into air-quality meters and ventilation controls.
Designed for Reliable Integration
Key Features
UART and PWM Outputs
Supports two common digital output methods for embedded equipment.
Compact Installation
The 32.9 × 19.7 × 8.6 mm module is offered in pin or terminal versions.
Temperature Compensation
Built-in compensation supports stable, linear CO2 output.
Water-vapor and Poisoning Resistance
Designed to resist water-vapor interference and poisoning.
Stable NDIR Measurement
Provides oxygen-independent CO2 detection with good selectivity.
Typical Use Cases
Applications
Smart Home Devices
Air Cleaner Equipment
Indoor Air Quality Monitoring
Ventilation Systems
Official Product Parameters
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | MH-Z19D |
| Detected Gas | Carbon dioxide (CO2) |
| Detection Principle | Non-dispersive infrared (NDIR) |
| Measurement Range | 400–2000 ppm, 400–5000 ppm or 400–10,000 ppm |
| Resolution | 1 ppm |
| Accuracy | ±(50 ppm + 5% of reading) |
| Working Voltage | 5.0±0.1 V DC |
| Average Current | <40 mA at 5 V |
| Peak Current | 125 mA at 5 V |
| Interface Level | 3.3 V, compatible with 5 V |
| Output Signal | UART, TTL 3.3 V; PWM |
| Preheat Time | 1 min |
| Response Time | T90 <120 s |
| Operating Temperature | 0°C to +50°C |
| Operating Humidity | 0–95% RH, non-condensing |
| Storage Temperature | -20°C to +60°C |
| Dimensions | 32.9 × 19.7 × 8.6 mm |
| Weight | 5 g |
| Expected Lifespan | >5 years |
Specifications are based on the official Winsen product page. Confirm the latest datasheet, communication protocol, calibration requirements and mechanical drawing before final product design.
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