Gold-plated Optical Chamber
The optical chamber is gold plated to support stable infrared measurement.
MH-Z19C NDIR CO2 Sensor Module
The MH-Z19C is a compact NDIR CO2 sensor module with selectable 400–2000 ppm, 400–5000 ppm and 400–10,000 ppm ranges. It provides UART and PWM outputs for indoor air-quality, HVAC and smart ventilation equipment.
BrandWinsen
Sensing PrincipleNDIR
Target GasCO2
Product TypeNDIR CO2 Sensor Module
CO2 Sensing for OEM Integration
Product Overview
A compact gold-plated-chamber NDIR module for reliable indoor CO2 monitoring with UART and PWM outputs.
The MH-Z19C uses non-dispersive infrared technology to measure carbon dioxide with good selectivity, no oxygen dependence and a long operating life.
Built-in temperature compensation and a 3.3 V logic-level interface simplify integration into air-quality meters, ventilation controls and smart-home devices.
Designed for Reliable Integration
Key Features
Selectable CO2 Ranges
Available with 400–2000 ppm, 400–5000 ppm or 400–10,000 ppm measurement ranges.
Dual Digital Outputs
UART and PWM outputs support different host-controller designs.
Temperature Compensation
Integrated compensation supports linear output across the specified operating environment.
Compact Module
The 32.9 × 19.7 × 8.6 mm format is suitable for embedded IAQ products.
Long Lifespan
The official product specification states a service life of more than 10 years.
Typical Use Cases
Applications
HVAC and Refrigeration
Air Purifiers
Indoor Air Quality Monitors
Smart Home Devices
Ventilation Systems
Schools and Classrooms
Official Product Parameters
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | MH-Z19C |
| 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 | -10°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 | >10 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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