Low Average Current
Average operating current is specified below 30 mA at 5 V.
MH-Z1911A NDIR CO2 Sensor Module
The MH-Z1911A is a small intelligent NDIR CO2 sensor module for offices, homes, classrooms, airports and building-control equipment. It offers selectable measurement ranges, low average current, built-in temperature compensation, UART and PWM output.
BrandWinsen
Sensing PrincipleNDIR
Target GasCO2
Product TypeNDIR CO2 Sensor Module
CO2 Sensing for OEM Integration
Product Overview
A RESET-compliant NDIR CO2 module developed for indoor environmental monitoring and building automation.
The sensor combines infrared absorption technology, optical-circuit design and signal processing to detect carbon dioxide independently of oxygen concentration.
Its compact pin-type package and multiple output options make it suitable for CO2 meters, air purifiers, HVAC systems and other embedded IAQ products.
Designed for Reliable Integration
Key Features
Selectable Detection Range
Supports optional ranges from 400 ppm up to 10,000 ppm.
UART and PWM Outputs
Two output methods offer flexibility for embedded control systems.
Temperature Compensation
Built-in compensation supports accurate and linear CO2 output.
RESET Compliant
The product page identifies the module as RESET compliant.
Long Service Life
The official specification states a lifespan of more than 10 years.
Typical Use Cases
Applications
HVAC Systems
Air Purifiers
Air Quality Monitors
Consumer CO2 Meters
Smart Home Devices
Building Automation
Indoor Environmental Control
Official Product Parameters
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | MH-Z1911A |
| Detected Gas | Carbon dioxide (CO2) |
| Detection Principle | Non-dispersive infrared (NDIR) |
| Measurement Range | 400–10,000 ppm, optional |
| Working Voltage | 5.0±0.1 V DC |
| Average Current | <30 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 |
| Compliance | RESET compliant |
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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